diff --git a/_data/footer.yml b/_data/footer.yml index 0690532..c041d61 100755 --- a/_data/footer.yml +++ b/_data/footer.yml @@ -11,14 +11,12 @@ link: /blog - name: About link: /about - - name: Podcast - link: https://www.trekview.org/blog/category/expodition/ - name: Contact link: /contact - links: - - name: Slack Community - link: https://join.slack.com/t/trekview/shared_invite/zt-1gb4upchi-52pmWhPiwhFaAQqm0vWmJg + - name: Forum + link: https://campfire.trekview.org social_icon: new_window: true - name: Github diff --git a/_data/navigation.yml b/_data/navigation.yml index 3091874..8d15048 100755 --- a/_data/navigation.yml +++ b/_data/navigation.yml @@ -6,15 +6,11 @@ link: /about new_window: false highlight: false -- name: Do it Yourself - link: /trek-pack - new_window: false +- name: Forum + link: https://campfire.trekview.org + new_window: true highlight: false - name: Spotted a Trekker? - link: https://dashboard.mailerlite.com/forms/791569/111330035451823458/share - new_window: false - highlight: true -- name: Upload Your Imagery link: https://dashboard.mailerlite.com/forms/791569/111330035451823458/share new_window: false highlight: true \ No newline at end of file diff --git a/_drafts/csv-kml-conversion.md b/_drafts/csv-kml-conversion.md deleted file mode 100644 index baaa85d..0000000 --- a/_drafts/csv-kml-conversion.md +++ /dev/null @@ -1,122 +0,0 @@ ---- -date: 2020-05-06 -title: "Converting CSV files to KML" -description: "Lot's of devices, including the Atmotube, allow you to export data to CSV files. Here's how you can turn it into a map friendly format." -categories: developers -tags: [] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-04-09/ -featured_image: /assets/images/blog/2020-04-09/ -layout: post -published: false ---- - -**Turn your CSV into a map friendy format.** - -Last week I showed you how to map the data produced by Atmotube Pro in Google Earth Pro. - -In order to do this, I needed to convert the `.csv` file produced by the Atmotube Pro into `.kml` ([Keyhole Markup Language](https://developers.google.com/kml)) format. - -> KML is a file format used to display geographic data in an Earth browser such as Google Earth. - -KML is an international standard maintained by the Open Geospatial Consortium, Inc. (OGC). - -It's worth familarising yourself with the types of data that can be stored in .kml files ([the KML Reference document here is a great resource for this](https://developers.google.com/kml/documentation/kmlreference)) - -This post outlines the basics of how to create KML from the Atmotube `.csv` data using Python. - -For reference, [here's the sample `.csv` I use so you can follow along](https://drive.google.com/file/d/1-sQi_VuI82R4aqjH7yGy1NHHzAoeTmY2/view?usp=sharing). - -## The logic - -To help illustrate the turorial, here's a snippit of the first 5 lines from the `.csv` file: - -``` -Date,"VOC, ppm",AQS,"Temperature, °C","Humidity, %","Pressure, mbar","PM1, ug/m³","PM2.5, ug/m³","PM10, ug/m³",Latitude,Longitude -2021-03-14 10:38:00,0,98,9.5,48,1007.2,1,2,3,51.2725253,-0.8453277 -2021-03-14 10:39:00,0,98,7.7,55,1007,1,2,3,51.272167,-0.8337347 -2021-03-14 10:40:00,0,98,7,57,1007.1,1,2,3,51.2756212,-0.8417959 -2021-03-14 10:41:00,0,98,6.2,61,1007.5,1,2,3,51.277063,-0.8357297 -``` - -Notice how each line is a series of text strings separated by commas. Each comma delimits a field; each line has the same number of commas. - -The first line contains the names of the fields in order. For instance, the first block of text in each row is the "Date" field, the second "VOC, ppm", etc. - -Essentially we need to turn the `.csv` into an `XML` file (`kml` is a flavour of XML). - -[Google have a generic write-up of how this can be achieved here](https://developers.google.com/kml/articles/csvtokml), though given the custom fields in the AtmoTube data we need to do a bit of customisation to the script. - -We'll make use `` element that offers three techniques for adding custom data to a KML Feature: [These techniques are](https://developers.google.com/kml/documentation/kmlreference#extendeddata): - -1. [Adding untyped data/value pairs using the `` element](https://developers.google.com/kml/documentation/extendeddata#adding-untyped-namevalue-pairs) (basic) -2. [Declaring new typed fields using the `` element and then instancing them using the `` element](https://developers.google.com/kml/documentation/extendeddata#adding-typed-data-to-a-feature) (advanced) -3. [Referring to XML elements defined in other namespaces by referencing the external namespace within the KML file](https://developers.google.com/kml/documentation/extendeddata#adding-arbitrary-xml-data-to-a-feature) (basic) - -Adding new typed fields (option 2) is most suited to the Atmotube `.csv` data because it contains fields with values we might want to visualise later on (e.g. `"Temperature, °C"`) in other applications. The ability to define a `type` attribute for the `SimpleData` data attribute will allow us to do this. - -The following shows a template/sample for the way the script will represent the data from the AtmoTube `.csv` inside each `` of the `.kml` file: - -``` - - - - - - - - 2021-03-14 10:38:00 - 0 - 98 - 9.5 - 48 - 1007.2 - 1 - 2 - 3 - - - - 51.2725253,-0.8453277 - - - - - - - 2021-03-14 10:39:00 - 0 - 98 - 7.7 - 55 - 1007 - 1 - 2 - 3 - - - - 51.272167,-0.8337347 - - - - ... - -``` - -## The code - -My sample code for creating a KML file from a Atmotube `.csv` file using Python 3.8 can be found on Github here. - -## Sample KML created - -A sample of the KML that this script created from my Atmotube `.csv` can be seen on Github here. - -## Working with the KML file - -Lot's of mapping tools can use `.kml` files natively, including Google Earth. - -Note: You can also import `.csv` files to Google Earth, but it requires a level of effort on the user to assign the fields correctly. - -We can also write out to Google Maps JS> - diff --git a/_drafts/ffmpeg-video-to-frame-cheat-sheet-part-2.md b/_drafts/ffmpeg-video-to-frame-cheat-sheet-part-2.md deleted file mode 100644 index 6305389..0000000 --- a/_drafts/ffmpeg-video-to-frame-cheat-sheet-part-2.md +++ /dev/null @@ -1,122 +0,0 @@ ---- -date: 2022-03-17 -title: "FFmpeg Cheat Sheet for virtual 360 tours (Part 2)" -description: "A guide that shows some of the commands we use most for processing 360 virtual tour videos." -categories: developers -tags: [exiftool, ffmpeg, gmpd, telemetry, metadata] -author_staff_member: dgreenwood -image: /assets/images/blog/2022-03-11/ffmpeg-virtual-tour-cheat-sheet-meta.jpg -featured_image: /assets/images/blog/2022-03-11/ffmpeg-virtual-tour-cheat-sheet-sm.jpg -layout: post -published: false ---- - -At the end of last weeks post I teased you with a possible part 2 of my post; [FFmpeg Cheat Sheet for virtual 360 tours](/blog/ffmpeg-video-to-frame-cheat-sheet). - -Well here it is. - -In part one I talked about taking a video and turning it into frames, something we do to create a series of photos for a virtual tour. - - -Thi - -If this sounds familiar, then it is. [I've talked briefly about doing this before](/blog/turn-360-photos-into-360-video). - -Though this didn't include modification of telemetry - -or Google Street View submissions where the easiest way to submit content is in video format - - -If you're not part of our Slack commun - -## Is it possible to remove sound from .360 video with ffmpeg? - -Yes... but it requires a custom ffmpeg build. - -The master ffmpeg software build does not contain the right filters to convert GoPro’s EAC format out of the box (at the time of writing). As the process to do this will require copying the video, you will therefore need a custom ffmpeg fork with a GoPro EAC filter. - -[Early this year I showed how to install and run such an ffmpeg fork](/blog/using-ffmpeg-process-gopro-max-360/) that will do this. - -Once installed and running, you can use ffmpeg to remove the sound like so; - -```shell -ffmpeg -i INPUT.360 -vcodec copy -an OUTPUT.360 -``` - -If possible, I would generally advise removing the sound after processing the .360 into an .mp4 using the same method shown above as it can be done with vanilla ffmpeg. - -```shell -ffmpeg -i INPUT.mp4 -vcodec copy -an OUTPUT.mp4 -``` - -In both cases, you will need to copy over the global metadata tags; - -```shell -exiftool -TagsFromFile INPUT.360 "-all:all>all:all" INPUT.360 -``` - -## I want to create a 16:9 thumbnail from a 360 frame - -The easy - - - - - - -```shell -ffprobe GS018423.360 -``` - -``` -Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'GS018423.360': - Metadata: - major_brand : mp41 - minor_version : 538120216 - compatible_brands: mp41 - creation_time : 2021-09-04T08:25:53.000000Z - location : +51.2726-000.8460/ - location-eng : +51.2726-000.8460/ - firmware : H19.03.02.00.00 - Duration: 00:00:18.59, start: 0.000000, bitrate: 66531 kb/s - Stream #0:0[0x1](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 2272x736 [SAR 1:1 DAR 71:23], 29981 kb/s, 59.94 fps, 59.94 tbr, 60k tbn (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro H.265 - vendor_id : [0][0][0][0] - encoder : GoPro H.265 encoder - timecode : 08:25:23:20 - Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 188 kb/s (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro AAC - vendor_id : [0][0][0][0] - timecode : 08:25:23:20 - Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro TCD - timecode : 08:25:23:20 - Stream #0:3[0x4](eng): Data: bin_data (gpmd / 0x646D7067), 117 kb/s (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro MET - Stream #0:4[0x5](eng): Data: none (fdsc / 0x63736466), 28 kb/s (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro SOS - Stream #0:5[0x6](eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 2272x736 [SAR 1:1 DAR 71:23], 30011 kb/s, 59.94 fps, 59.94 tbr, 60k tbn (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro H.265 - vendor_id : [0][0][0][0] - encoder : GoPro H.265 encoder - timecode : 08:25:23:20 - Side data: - displaymatrix: rotation of nan degrees - Stream #0:6[0x7](eng): Audio: pcm_s32le (in32 / 0x32336E69), 48000 Hz, ambisonic 1, s32, 6144 kb/s (default) - Metadata: - creation_time : 2021-09-04T08:25:53.000000Z - handler_name : GoPro AMB - vendor_id : [0][0][0][0] -``` \ No newline at end of file diff --git a/_drafts/introduction-to-kml.md b/_drafts/introduction-to-kml.md deleted file mode 100644 index ec58af2..0000000 --- a/_drafts/introduction-to-kml.md +++ /dev/null @@ -1,25 +0,0 @@ ---- -date: 2021-09-03 -title: "" -description: "" -categories: guides -tags: [KML, Keyhole Markup Language, Google, Google Earth] -author_staff_member: dgreenwood -image: /assets/images/blog/2021-09-03/ -featured_image: /assets/images/blog/2021-09-03/ -layout: post -published: false ---- - - -Keyhole Markup Language KML is a file format used to display geographic data. - -It was developed by Google - -KML was developed for use with Google Earth, which was originally named Keyhole Earth Viewer. It was created by Keyhole, Inc, which was acquired by Google in 2004. - -KML became an international standard of the Open Geospatial Consortium in 2008, though it's still mostly used only in Google Earth. - - in an Earth browser such as Google Earth. - -The KML file specifies a set of features (place marks, images, polygons, 3D models, textual descriptions, etc.) that can be displayed on maps in geospatial software implementing the KML encoding. Each place always has a longitude and a latitude. Other data can make the view more specific, such as tilt, heading, altitude, which together define a "camera view" along with a timestamp or timespan. KML shares some of the same structural grammar as Geography Markup Language (GML). \ No newline at end of file diff --git a/_posts/2019-05-17-hello-trekkers.md b/_posts/2019-05-17-hello-trekkers.md deleted file mode 100644 index f5b88a7..0000000 --- a/_posts/2019-05-17-hello-trekkers.md +++ /dev/null @@ -1,92 +0,0 @@ ---- -date: 2019-05-17 -title: "Hello, Trekkers!" -description: "I believe sharing interactive 360-degree imagery of our world can inspire others to explore and protect it." -categories: updates -tags: [Trek Pack, David Attenborough, Google Street View, GoPro, Fusion, Pixel 2] -author_staff_member: dgreenwood -image: /assets/images/blog/2019-05-17/tiede-tenerife-virtual-tour-meta.jpg -featured_image: /assets/images/blog/2019-05-17/tiede-tenerife-virtual-tour-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2019/hello-trekkers ---- - -**I believe sharing interactive 360-degree imagery of our world can inspire others to explore and protect it.** - -Mount Tiede Virtual Tour - -Allow me to share two recent observations; - -1. My Grandfather is no longer being able to leave his house easily due to worsening dementia. Personally, I could not imagine being confined to an apartment, no matter how large or luxurious. I'm not sure he would have either only a few years ago. Now he longs to explore the countryside. - -2. My niece and nephew watching David Attenborough documentaries in awe of the wildlife, not quite old enough to realise what they're seeing exists, but might not by the time they've grown up. As the the presenter notes with sorrow, "an area the size of a football pitch is being destroyed in the Amazon every minute^". - -* Source: ['Football pitch' of Amazon forest lost every minute](https://www.bbc.co.uk/news/science-environment-48827490) - -I've always been fascinated by Google Street View imagery. Whether seeking out directions for an upcoming meeting or exploring new neighbourhoods thousands of kilometres away. - -Thus, I was left me questioning; does a Street View for the natural world exist? - -[Some brief research uncovered Google Maps Treks](https://www.google.co.uk/maps/about/treks/#/grid). - -Hours of virtually exploring mountains and jungles later, I wanted to get out and create my own imagery of the beautiful British countryside to share with my family, and fellow virtual trekkers across the globe. - -## Official Street View Camera Backpacks - -Official Google Street View camera backpack - -The good news; [Google provides Street View Camera Loans](https://www.google.com/intl/None/streetview/loan/) to a wide range of people from pro photographers, travellers, and organisations (such as tourism boards, non-profits, government agencies, universities or research groups). - -The bad news; the waiting list is long. And I didn't want to wait. - -Back to the drawing board. - -## Street View Ready Cameras - -A little more research uncovered [Street View Ready cameras](https://www.google.com/streetview/contacts-tools/products/). These are 360-degree cameras certified by Google for publishing imagery on Google Street View. - -It appeared I was not alone. Thousands of other photographers around the world are also interested in doing the same thing as the market for Street View Ready cameras demonstrated. - -Even better, all options would be much more mobile than the Google Camera Backpacks, though would sacrifice _slightly_ on image quality and the benefits of Google's automation software for publishing photos. - -## DIY Street View Camera Backpack - -DIY Street View camera backpack front - -DIY Street View camera backpack back - -After purchasing a Street View Ready camera, [I chose a GoPro Fusion](https://gopro.com/en/gb/shop/cameras/fusion/CHDHZ-103-master.html), all that was required was a backpack and monopod that could be used to mount the camera above my head to give it a clear line of site the world around me. - -[_Update 2019-06-01: Step-by-step guide of how I created a DIY Street View Camera Backpack_]({% post_url 2019-06-14-diy-google-street-view-part-1-how-trek-view-started %}). - -Now I could start shooting. - -Armed with my DIY camera rig, inspired by Google's own Street View backpack camera, I started taking photos on my local canal. - -## What's that?!?!? - -In conversation with others our exploring the canal -- it's amazing how interested people are in a person with a camera mounted above their head -- it became clear others were keen to see the imagery online and to share it with friends and family in other parts of the country. - -My grandfather loves exploring what I've captured using a virtual reality headset (I use the [Google Daydream View headset](https://vr.google.com/daydream/) together with my Pixel 2 phone). - -As do my niece and nephew, who are now excited to see the images brought to life in person. - -And there appears to be no shortage for interest in this type of imagery. - -## Introducing Trek View - -I've spoken to: - -* Care providers who believe 360-degree imagery can improve health outcomes for housebound patients, -* Schools who want to incorporate 360-degree imagery for interactive lessons on the natural world, -* Conservationists who are exploring the use of 360-degree imagery to keep a record of changes to the environment, -* Tourism boards who know 360-degree tours can be a powerful tool in attracting new visitors, and -* [Hopefully many more people in the future]({{ site.baseurl }}/contact)... - -I believe interactive 360-degree imagery of our world can inspire others to explore and protect it, benefiting both the viewer, creator, and in-turn, the planet. - -I want to make it easy for anyone, anywhere, to create and share virtual 360-degree tours with this belief in mind. - -I have a few ideas up my sleeve... \ No newline at end of file diff --git a/_posts/2019-11-08-location-codes-unmapped-hiking-trails.md b/_posts/2019-11-08-location-codes-unmapped-hiking-trails.md deleted file mode 100644 index 2ed3829..0000000 --- a/_posts/2019-11-08-location-codes-unmapped-hiking-trails.md +++ /dev/null @@ -1,62 +0,0 @@ ---- -date: 2019-11-08 -title: "Trails Don't have Addresses" -description: "Using location codes to map even the most remote hiking trails." -categories: developers -tags: [Google, Plus Code, What3Words, Google, GPS] -author_staff_member: dgreenwood -image: /assets/images/blog/2019-11-08/open-location-code-plus-code-glenmore-scotland-meta.jpg -featured_image: /assets/images/blog/2019-11-08/open-location-code-plus-code-glenmore-scotland-sm.png -layout: post -published: true -redirect_from: - - /blog/2019/location-codes-unmapped-hiking-trails ---- - -**Using location codes to map even the most remote hiking trails.** - -[That's where I was this morning](https://what3words.com/tiger.alive.single). - -Tonight I'll be heading to [pigs.taking.dads](https://what3words.com/pigs.taking.dads) to meet friend. - -In the Western World we're more familiar with street addresses for referencing places. - -When sending a letter or parcel, you mark the address on the package and attach the stamp or postage label. - -When placing an online order, you include a delivery and billing address. - -When organising a meeting, you include the address of where it will be held so other attendees can find it. - -Though in some areas, new streets spring up by the day. For example, in emergency situations where camps are erected quickly. - -In these situations; where do you direct much needed medical supplies? - -_Turn left at the tap, go past the phone shop, turn right by the washing line, but only if you're coming on Tuesday, because the owner only does their washing on Tuesdays._ - -[Only the best postal workers will be able to use a hand drawn map](https://www.facebook.com/HookLighthouse/posts/1058520717580115:0)! - -Similarly, many hiking trails are unmapped. Or evolve over time as the landscape changes (erosion, landslides, etc.). In these cases; how do you point people in the right direction? - -Co-ordinates are one solution, but can be complex to share in person or over the phone. - -In 2013 I discovered [What3Words](https://what3words.com/). They have coded every 3m square in the world a unique 3 word address that will never change. - -3 word addresses are easy to say and share, and are as accurate as GPS coordinates. - -`51.520847`, `-0.19552100` = [`filled.count.soap`](https://what3words.com/filled.count.soap) - -Glenmore Scotland Plus Code - -Google have launched a similar, open-source initiative, [Plus Codes](https://plus.codes/). - -Like What3Words, Plus codes give addresses to everyone, everywhere. - -A Plus Code looks like this: [`5894+3W`](https://plus.codes/9C9R5894+3W). - -Not quite as intuitive as What3Words codes, but they are used in and by Google Maps, which makes them more accessible. - -Enter a location and the online Plus Code tool will generate a code[Plus Codes](https://plus.codes/). - -Enter a Plus Code and Google Maps will return the exact location -- perfect for the millions of people with the Google Maps app installed on their phones. - -I currently take advantage of [the open-source Python Open Location Code library available on Github that converts co-ordinates into Plus Codes](https://github.com/google/open-location-code). \ No newline at end of file diff --git a/_posts/2020-03-13-what-is-a-nadir.md b/_posts/2020-03-13-what-is-a-nadir.md deleted file mode 100644 index 133e624..0000000 --- a/_posts/2020-03-13-what-is-a-nadir.md +++ /dev/null @@ -1,42 +0,0 @@ ---- -date: 2020-03-13 -title: "What is a Nadir? What is a Zenith?" -description: "In short, directly below, and directly above, respectively." -categories: developers -tags: [Trek Pack, nadir, zenith] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-03-13/horizon-coords-meta.jpg -featured_image: /assets/images/blog/2020-03-13/horizon-coords-sm.png -layout: post -published: true -redirect_from: - - /blog/2020/what-is-a-nadir ---- - -**In short, directly below, and directly above, respectively.** - -[The Oxford English Dictionary defines a nadir as](https://www.lexico.com/definition/nadir): - -> The point on the celestial sphere directly below an observer. -> -> (The opposite of zenith) - -![Nadir and Zenith diagram](/assets/images/blog/2020-03-13/horizon-coords-sm.png "Nadir and Zenith diagram") - -The nadir is the direction pointing directly below a particular location whereas the zenith points directly below. - -360 images will often capture mounts the camera is attached to in the nadir or zenith areas; tripods, helmets, drones, etc. - -In some cases, the 360-degree camera have blind-spots in the nadir and zenith area that are filled in during stitching. - - - -Similarly, more advanced software, notably Google Street View, can seemingly remove entire cars from the nadir by blurring the area using the surrounding terrain. - -[Google also allows Street View trusted photographers to overlay their own branding in the nadir and zenith areas of their photos](https://www.google.com/streetview/sales/). - - - -The GoPro Fusion's and MAX's we use with our trekker pack do have a partial blind spot in the nadir and zenith area -- evident in the "join lines" between the stitched photograph (look down in the image above)... but we still have enough space to point viewers and passers-by to [trekview.org](https://www.trekview.org) using the Trek Pack branding! - -Perhaps that's how you found us? \ No newline at end of file diff --git a/_posts/2020-07-10-gps-101.md b/_posts/2020-07-10-gps-101.md deleted file mode 100644 index 3cd82f8..0000000 --- a/_posts/2020-07-10-gps-101.md +++ /dev/null @@ -1,115 +0,0 @@ ---- -date: 2020-07-10 -title: "How does GPS work?" -description: "Learn how GPS works and why some receivers are more accurate than others." -categories: developers -tags: [GPS, DGPS, GPS Logger, IMU, myTracks, Columbus V-1000] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-07-10/gps-satellite-meta.jpg -featured_image: /assets/images/blog/2020-07-10/gps-satellite-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2020/gps-101 ---- - -**Learn how GPS works and why some receivers are more accurate than others.** - -At any given time, there are at least 24 active satellites orbiting over 12,000 miles above earth. - -These satellites are owned by the United States government and operated by the United States Space Force. They power the Global Positioning System (GPS). - -The positions of the satellites are constructed in a way that the sky above your location will always contain at most 12 satellites. - -The primary purpose of the 12 visible satellites is to transmit information back to earth over radio frequency (ranging from 1.1 to 1.5 GHz). - -GPS satellite orbit - -The data sent down to earth from each satellite contains a few different pieces of information that allows a GPS receiver to accurately calculate its position and time. - -A GPS receiver is a device that can listen for (using an antenna), understand, and process the information transmitted by the satellite. Almost all modern smartphones contain GPS receivers. - -An important piece of equipment on each GPS satellite is an extremely accurate atomic clock. The time on the atomic clock is sent down to earth along with the satellite’s orbital position and arrival times at different points in the sky. In other words, the GPS module receives a timestamp from each of the visible satellites, along with data on where in the sky each one is located (among other pieces of data). This data is known as the GPS almanac. - -If the GPS receiver’s antenna can see at least 4 satellites, it can accurately calculate its position and time using the GPS almanac data received. This is also called a lock or a fix. When you first turn on a GPS receiver (like your camera), it can take a few minutes for it to lock onto 4 satellites. - -Nearly all GPS receivers convert the GPS almanac to NMEA data output. The NMEA standard is formatted in lines of data called sentences. Each sentence contains various bits of data organised in comma delimited format. Here’s example NMEA sentences from a GPS receiver with satellite lock (4+ satellites, accurate position): - -``` -$GPRMC,235316.000,A,4003.9040,N,10512.5792,W,0.09,144.75,141112,,*19 -$GPGGA,235317.000,4003.9039,N,10512.5793,W,1,08,1.6,1577.9,M,-20.7,M,,0000*5F -$GPGSA,A,3,22,18,21,06,03,09,24,15,,,,,2.5,1.6,1.9*3E -``` - -For example, the GPGGA sentence contains the follow: - -* Time: 235317.000 is 23:53 and 17.000 seconds in Greenwich mean time -* Longitude: 4003.9040,N is latitude in degrees.decimal minutes, north -* Latitude: 10512.5792,W is longitude in degrees.decimal minutes, west -* Number of satellites seen: 08 -* Altitude: 1577 metres - -Although it is technically possible to get a position from less than four satellites, the margin of error of this position can be rather large. As such, most devices are programmed to start reporting data after locking onto at least four satellites. - -## GPS Positional Accuracy - -GPS signal line of sight - -[GPS-enabled smartphones are typically accurate to within a 5m radius under open skies](https://www.gps.gov/systems/gps/performance/accuracy/). - -GPS Accuracy depends on a number of variables; the quality of GPS receiver, signal to noise ratio (noisy reception), satellite position, environment (weather, skyline visibility, enclosed spaces, multi-path reception), obstructions such as buildings and mountains, and on smartphones the device state (low power mode, flight mode, initial fix). - -It's also worth noting almost all mobile devices process GPS at the rate of 1Hz (1 GPS measurement a second) to save power (and cost of GPS chips). - -All of these factors can create errors in your reported location. - -Signal noise usually creates an error from around one to ten metres. - -Mountains, buildings and other things that might obstruct the path between the receiver and the satellite can cause three times as much error as signal noise. - -If you've ever used a GPS receiver in a narrow, high-sided canyon, or in a densely wooded forest, it's very likely you'll have observed significant inaccuracies in the reported coordinates. - -The most accurate read of your location comes when you have a clear view of a clear sky away from any obstructions and under more than four satellites. - -Altitude can often appear particularly inaccurate. New GPS buyers often suspect their equipment may even be defective when they see the altitude readout at a fixed point vary by many 10's of metres. This is normal. - -[According to this post](http://gpsinformation.net/main/altitude.htm): - -``` -With most low cost GPS receivers, the horizontal error is specified to be within about +/- 15 metres (50 feet) 95% of the time... Generally, Altitude error is specified to be 1.5 x Horizontal error specification. This means that the user of standard consumer GPS receivers should consider +/-23meters (75ft) with a DOP of 1 for 95% confidence. -``` - -To combat these errors, a couple of different assistants have been created. - -AGPS (Assisted GPS) uses wireless (ground-based) networks to help relay between the satellite and the receiver when the GPS signal is weak or not able to be picked up. AGPS is mostly accomplished by GPS receivers mounted on cellular towers. When communicating with these receivers, the GPS can acquire a lock on the satellite more quickly as well as receive more accurate information. This method is what is used for GPS in mobile phones and why they’re sometimes more accurate than the GPS receivers on their own. - -AGPS is most beneficial in cities where the GPS signal may have a difficult time making it through the dense maze of the buildings. In areas where there's no mobile signal it offers little - -Another method is DGPS (Differential GPS). DGPS also uses ground or fixed GPS stations to determine the location, but differs in that it finds the difference between both the satellite and the ground location reading. These ground stations may be up to 200 nautical miles from the receiver. As an example, one form of DGPS is WAAS (Wide Area Augmentation System). Originally developed by the FAA to assist aircraft GPS, WAAS uses a system of specifically built ground stations. WAAS holds a specific set of accuracy standards that ground station measurements must meet. - -DGPS receivers have additional antenna that receive signals not only from satellites but directly from the ground stations. DGPS devices usually require two antennas. These are much larger and more expensive than your standard GPS device [but can provide centimeter accuracy in position](https://en.wikipedia.org/wiki/Differential_GPS) (it is important to note that accuracy deteriorates the further you are from the ground station). As such, DGPS units are also expensive and tend to be larger, and therefore only typically used for work where accurate location readings are important (e.g. aircrafts). - -## Improving GPS accuracy for outdoor 360 mapping - -When it comes to capturing GPS for 360 mapping, you're somewhat limited with regards to the improvements you can make. - -_You can't cut down trees to create a clear line of site to the sky when shooting in a forest._ - -Checking for clear weather conditions before shooting can help improve accuracy (look for sunny, dry days). - -For many tours I now also capture a secondary GPS track in addition to the data reported by the GoPro MAX's GPS receiver as a backup. - -In most areas (with a mobile signal) I'll use my phone to do this. There are an abundance of apps that can perform GPS logging functions (search GPS logger). Ideally what you want is a tracker that will log telemetry (at a minimum; time, latitude, longitude, and altitude) to a CSV or GPX file. - -I have tested the two below which, from my own usage, seem to perform well and meet the above requirements: - -* [GPS Logger (Android)](https://play.google.com/store/apps/details?id=com.mendhak.gpslogger&hl=en_GB) -* [myTracks (Apple)](https://apps.apple.com/gb/app/mytracks-the-gps-logger/id358697908) - -If your camera geo-tags photos files using the Google Street View mobile app then you will already be taking advantage your phone ability to geotag photos and won't need to use a secondary app. - -Columbus V-1000 - -In more remote areas where I can't rely on a mobile signal, I will bring along a standalone GPS receiver. Currently I'm using the [Columbus V-1000](https://www.amazon.com/Columbus-Barometric-Temperature-Navigation-Compatible/dp/B01IKV65QS) which has performed well to date and has very good battery life (16 hours). - -When returning home, I'll then stitch the secondary GPS track into the images using [Image Geotagger](https://github.com/trek-view/image-geotagger), a Python script we wrote that; 1) takes a series of timestamped images, 2) a timestamped GPS track log, 3) uses linear interpolation to determine the GPS position in the track at the time the image was captured, 4) then writes the correct geo-tags into each image from the track. \ No newline at end of file diff --git a/_posts/2020-10-23-expodition-podcast-launch.md b/_posts/2020-10-23-expodition-podcast-launch.md deleted file mode 100644 index d05a993..0000000 --- a/_posts/2020-10-23-expodition-podcast-launch.md +++ /dev/null @@ -1,44 +0,0 @@ ---- -date: 2020-10-23 -title: "Announcing the ExPODition Podcast" -description: "Climb. Ski. Hike. Bike. Paddle. Run. Travel. Stories from 'everyday people' who have embarked on amazing adventures." -categories: expodition -tags: [Chris Lucas, Niall Lucas, Canada, Yukon, David Greenwood, Trek View] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-10-23/expodition-episode-1-yukon-assignment-meta.jpg -featured_image: /assets/images/blog/2020-10-23/expodition-episode-1-yukon-assignment-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2020/expodition-podcast-launch ---- - -**Climb. Ski. Hike. Bike. Paddle. Run. Travel. Stories from 'everyday people' who have embarked on amazing adventures.** - -I love podcasts. - -I've been wanting to create one for a while, but wasn't quite sure where to start. - -After much research -- too much research -- ExPODition is our first foray into the podcasting world (very late, I know!). - -Every two weeks I'm going to be talking with 'everyday people' who have embarked on amazing adventures. - -In some ways it's to fulfil my own lockdown wonderlust, but I am certain the people I speak with will inspire many of you too. - -And the first episode is a corker! - -In the first episode of ExPODition I talk with British adventurer Chris Lucas about canoing down one of the most remote rivers in Canada with his father. - -The conversation was recorded remotely on September 30th, 2020. - - - -**Related links** - -* The Yukon Assignment website (inc. links to watch): [http://www.yukonassignment.org/](http://www.yukonassignment.org/) -* Chris' website: [https://www.chrislucasproadventure.com/](https://www.chrislucasproadventure.com/) -* Wilderness Photographic: [https://www.wildernessphotographic.com/](https://www.wildernessphotographic.com/) -* Chris on Twitter: [https://twitter.com/ChrisLucasProAd](https://twitter.com/ChrisLucasProAd) -* Chris on Instagram: [https://instagram.com/Christo35mm](https://instagram.com/Christo35mm) - -I hope you enjoy listening as much as I enjoyed recording. \ No newline at end of file diff --git a/_posts/2020-11-06-expodition-episode-2-unbounded.md b/_posts/2020-11-06-expodition-episode-2-unbounded.md deleted file mode 100644 index b71b775..0000000 --- a/_posts/2020-11-06-expodition-episode-2-unbounded.md +++ /dev/null @@ -1,29 +0,0 @@ ---- -date: 2020-11-06 -title: "ExPODition EP.2 - Unbounded" -description: "A young, unaided crew of four as they hike and pack-raft for four months into the infinite region known as Patagonia." -categories: expodition -tags: [David Greenwood, Trek View, Patagonia, Argentina, Chile, Garrett Martin] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-11-06/expodition-episode-2-unbounded-meta.jpg -featured_image: /assets/images/blog/2020-11-06/expodition-episode-2-unbounded-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2020/expodition-episode-2-unbounded ---- - -**A young, unaided crew of four as they hike and pack-raft for four months into the infinite region known as Patagonia.** - -“Unbounded” is an adventure-travel documentary following a young, unaided crew of four as they hike and pack-raft for four months into the infinite region known as Patagonia. The crew’s journey is based along the “Greater Patagonian Trail," a relatively unknown route that is now the longest continual trail network in South America. - -In this episode of ExPODition, David talks with Garrett Martin about the trip. Garrett not only directed and shot the film, he stars in it too. - -The conversation was recorded remotely on September 24th, 2020. - - -**Related links** - -Garrett's website: [https://garrettrmartin.com/](https://garrettrmartin.com/) -Unbounded film website: [http://www.unboundedthefilm.com/](http://www.unboundedthefilm.com/) -What Garrett is currently working on: [https://www.hotspotdoc.com/](https://www.hotspotdoc.com/) \ No newline at end of file diff --git a/_posts/2020-11-20-expodition-episode-3-sea-gypsies.md b/_posts/2020-11-20-expodition-episode-3-sea-gypsies.md deleted file mode 100644 index aac5afd..0000000 --- a/_posts/2020-11-20-expodition-episode-3-sea-gypsies.md +++ /dev/null @@ -1,32 +0,0 @@ ---- -date: 2020-11-20 -title: "ExPODition EP.3 - Sea Gypsies" -description: "A crew of 16 left New Zealand on an 8,000 mile pacific crossing to Patagonia, with a stop in Antarctica." -categories: expodition -tags: [Nico Edwards, Antarctica, David Greenwood, Trek View, Infinity, Clemens Gabriel Oestreich] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-11-20/expodition-episode-3-sea-gypsies-meta.jpg -featured_image: /assets/images/blog/2020-11-20/expodition-episode-3-sea-gypsies-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2020/expodition-episode-3-sea-gypsies ---- - -**A crew of 16 left New Zealand on an 8,000 mile pacific crossing to Patagonia, with a stop in Antarctica.** - -The vessel is Infinity, a 120ft hand-built sailing ketch that plies the Pacific Ocean on a never ending voyage of nomadic exploration. In early Feb 2014, during the iciest year on record in the Southern Ocean, Infinity and her crew of 16 left New Zealand on an 8,000 mile pacific crossing to Patagonia, with a stop in Antarctica. - -This is a story about sailing, the camaraderie of a shared struggle and the raw awe inspiring power of the natural world. - -In this episode of ExPODition, David talks with director Nico Edwards about being a crewmember onboard the Infinity. - -The conversation was recorded remotely on September 29th, 2020. - - - -**Related links** - -* Sea Gypsies website: [https://www.seagypsies.com/](https://www.seagypsies.com/) -* Sea Gypsies Facebook: [https://www.facebook.com/seagypsieschannel](https://www.facebook.com/seagypsieschannel) -* Sea Gypsies Instagram: [https://www.instagram.com/seagypsieschannel](https://www.instagram.com/seagypsieschannel) \ No newline at end of file diff --git a/_posts/2020-12-04-expodition-episode-4-dugout.md b/_posts/2020-12-04-expodition-episode-4-dugout.md deleted file mode 100644 index 87990cf..0000000 --- a/_posts/2020-12-04-expodition-episode-4-dugout.md +++ /dev/null @@ -1,32 +0,0 @@ ---- -date: 2020-12-04 -title: "ExPODition Ep.4 - Dugout" -description: "A journey through the Ecuadorian rainforest in a self-made dugout canoe." -categories: expodition -tags: [Benjamin Sadd, James Trundle, Amazon, Ecuador, David Greenwood, Trek View, rainforest] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-12-04/expodition-episode-4-dugout-meta.jpg -featured_image: /assets/images/blog/2020-12-04/expodition-episode-4-dugout-meta.jpg -layout: post -published: true -redirect_from: - - /blog/2020/expodition-episode-4-dugout ---- - -**A journey through the Ecuadorian rainforest in a self-made dugout canoe.** - -A journey through the Ecuadorian rainforest in a self-made dugout canoe. The film, DugOut, explores the Amazon beyond the adventure, documenting the lives of both the people and the wildlife who rely on the forest for survival. - -In this episode of ExPODition, David talks to Benjamin Sadd and James Trundle about their journey through the Ecuadorian rainforest in their canoe. - -The conversation was recorded remotely on September 23rd, 2020. - - - -**Related links** - -* DugOut official website (more about the film, and where to watch it): [https://www.dugoutadventure.com/](https://www.dugoutadventure.com/) -* James on Instagram: [https://www.instagram.com/j.j.trundle](https://www.instagram.com/j.j.trundle) -* James' company Porter + Trundle: [https://www.portertrundle.com/](https://www.portertrundle.com/) -* Ben's website: [https://www.benjaminsadd.com/](https://www.benjaminsadd.com/) -* Ben on Instagram: [https://www.instagram.com/benjaminsadd/](https://www.instagram.com/benjaminsadd/) \ No newline at end of file diff --git a/_posts/2020-12-18-expodition-episode-5-when-the-road-ends.md b/_posts/2020-12-18-expodition-episode-5-when-the-road-ends.md deleted file mode 100644 index f0a315f..0000000 --- a/_posts/2020-12-18-expodition-episode-5-when-the-road-ends.md +++ /dev/null @@ -1,32 +0,0 @@ ---- -date: 2020-12-18 -title: "ExPODition Ep.5 - When the Road Ends" -description: "The story of one mans journey from Central to South America on the Pacific on a raft, powered by a motorcycle." -categories: expodition -tags: [David Greenwood, Trek View, Columbia, Panama, Dylan Wickrama, Pacific Ocean] -author_staff_member: dgreenwood -image: /assets/images/blog/2020-12-18/expodition-episode-5-when-the-road-ends-video-meta.jpg -featured_image: /assets/images/blog/2020-12-18/expodition-episode-5-when-the-road-ends-video-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2020/expodition-episode-5-when-the-road-ends ---- - -**The story of one mans journey from Central to South America on the Pacific on a raft, powered by a motorcycle.** - -In 2010 Dylan dreamt of travelling the world on a motorcycle. After setting off from Switzerland in 2010 and journeying 200,000km, the road from Panama to Colombia came to an end, swallowed up by an impenetrable jungle. - -The solution? Dylan built a raft powered by his motorcycle engine in the hope of reaching Colombia's road network 700km away. He had to brave strong ocean currents and storms during his journey from Central to South America on the Pacific. - -In this episode of ExPODition, David talks with Dylan Wickrama about what it's like to live on a motorcycle powered raft out in the Pacific for 49 days. - -The conversation was recorded remotely on November 5th, 2020. - - - -**Related links** - -* Ride2xplore website: [https://www.ride2xplore.com/](https://www.ride2xplore.com/) -Ride2xplore Instagram: [https://www.instagram.com/ride2xplore/](https://www.instagram.com/ride2xplore/) -Ride2xplore Facebook: [https://www.facebook.com/ride2xplore/](https://www.facebook.com/ride2xplore/) \ No newline at end of file diff --git a/_posts/2021-01-01-expodition-episode-6-break-free.md b/_posts/2021-01-01-expodition-episode-6-break-free.md deleted file mode 100644 index 8ab7899..0000000 --- a/_posts/2021-01-01-expodition-episode-6-break-free.md +++ /dev/null @@ -1,32 +0,0 @@ ---- -date: 2021-01-01 -title: "ExPODition Ep.6 - Break Free" -description: "Two totally different characters, jammed together in two square metres of space for almost two years as they travel across Africa." -categories: expodition -tags: [David Greenwood, Trek View, Ulrich Stirnat, Lena Wendt, Africa, Land Rover, overland] -author_staff_member: dgreenwood -image: /assets/images/blog/2021-01-01/expodition-episode-6-break-free-meta.jpg -featured_image: /assets/images/blog/2021-01-01/expodition-episode-6-break-free-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2021/expodition-episode-6-break-free ---- - -**Two totally different characters, jammed together in two square metres of space for almost two years as they travel across Africa.** - -When Lena and Ulli start the engine of their old Land Rover, Lady Terés, they have a plan: to drive from Hamburg to South Africa in six months. What they don't know yet is that they won't ever get there. - -Two totally different characters, jammed together in two square metres of space for almost two years, they experience what it really means to travel: leaving your comfort zone for good. - -In this episode of ExPODition, David talks with Ulrich Stirnat and Lena Wendt about the trials and tribulations of an overland crossing of the African continent. - -The conversation was recorded remotely on November 20th, 2020. - - - -**Related links** - -* Film website (inc. links to watch): [https://www.reissausderfilm.de/](https://www.reissausderfilm.de/) -* Lena on Instagram: [https://www.instagram.com/lenalovesafrica](https://www.instagram.com/lenalovesafrica) -* Ulli on Instagram: [https://www.instagram.com/ulrichpopulrich](https://www.instagram.com/ulrichpopulrich) \ No newline at end of file diff --git a/_posts/2021-01-15-expodition-episode-7-broken-roads-to-siberia.md b/_posts/2021-01-15-expodition-episode-7-broken-roads-to-siberia.md deleted file mode 100644 index d5f5faa..0000000 --- a/_posts/2021-01-15-expodition-episode-7-broken-roads-to-siberia.md +++ /dev/null @@ -1,32 +0,0 @@ ---- -date: 2021-01-15 -title: "ExPODition Ep.7 - Broken Roads to Siberia" -description: "A 10,000 km, one month long journey through the Russian wilderness." -categories: expodition -tags: [David Greenwood, Trek View, Siberia, BAM road, Jyri Koski, Tuukka Josefsson, Russia, Mongolia, Altai mountains] -author_staff_member: dgreenwood -image: /assets/images/blog/2021-01-15/expodition-ep-7-broken-roads-to-siberia-meta.jpg -featured_image: /assets/images/blog/2021-01-15/expodition-ep-7-broken-roads-to-siberia-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2021/expodition-episode-7-broken-roads-to-siberia ---- - -**A 10,000 km, one month long journey through the Russian wilderness.** - -The idea of an off-road adventure, exploring western parts of Russia, Mongolia and Siberia had long been brewing in Jyri Koski’s head. - -Broken Road to Siberia is an adventure motorcycle film about two friends, Jyri and Tuukka, who ride to the infamous Vitim bridge in remote Siberia. - -The 10,000 km long journey through Russian wilderness, Altai mountains, Mongolian deserts and Siberian taiga take their toll as the journey progresses. - -In this episode of ExPODition, David talks with Jyri Koski and Tuukka Josefsson about their motorcycle journey across Russia and Mongolia. - -The conversation was recorded remotely on December 21st, 2020. - - - -**Related links** - -* Watch Broken Roads to Siberia on YouTube: [https://youtu.be/pDVVMo0_U6A](https://youtu.be/pDVVMo0_U6A) \ No newline at end of file diff --git a/_posts/2021-01-29-expodition-episode-8-the-road-to-sydney.md b/_posts/2021-01-29-expodition-episode-8-the-road-to-sydney.md deleted file mode 100644 index 46d1794..0000000 --- a/_posts/2021-01-29-expodition-episode-8-the-road-to-sydney.md +++ /dev/null @@ -1,33 +0,0 @@ ---- -date: 2021-01-29 -title: "ExPODition Ep.8 - The Road to Sydney" -description: "Zac Newham embarks on a 25,000 mile ride from his home in Ifield, England to Sydney, Australia." -categories: expodition -tags: [Trek View, David Greenwood, Zac Newham, China, Thailand, England, Australia, bicycle] -author_staff_member: dgreenwood -image: /assets/images/blog/2021-01-29/expodition-road-to-sydney-meta.jpg -featured_image: /assets/images/blog/2021-01-29/expodition-road-to-sydney-sm.jpg -layout: post -published: true -redirect_from: - - /blog/2021/expodition-episode-8-the-road-to-sydney ---- - -**Zac Newham embarks on a 25,000 mile ride from his home in Ifield, England to Sydney, Australia.** - -In 2013 Zac Newham embarked on a 25,000 mile solo cycle ride from his home in England to Sydney, Australia on his budget childhood bicycle. - -His film, The Road to Sydney, portrays a truthful (albeit whirlwind!) snapshot of this epic year and a half long journey on two wheels and palpably puts us all in the saddle as he pedals his way east. - -Funny, simple, unpretentious and full of good cheer. - -In this episode of ExPODition, David talks with Zac Newham about his bicycle ride half way round the world. - -The conversation was recorded remotely on January 11th, 2021. - - - -**Related links** - -* Watch The Road to Sydney on YouTube: [https://youtu.be/eb5B1P5DEXM](https://youtu.be/eb5B1P5DEXM) -* Zac's website: [https://www.natural-art.uk/](https://www.natural-art.uk/) \ No newline at end of file diff --git a/about/index.md b/about/index.md index 427c3e7..5a65159 100644 --- a/about/index.md +++ b/about/index.md @@ -5,7 +5,11 @@ description: We're building a Street View alternative for explorers image: /assets/images/global/trek-view-360-degree-tour.jpg layout: page redirect_from: - - + - /blog/2019/hello-trekkers + - /blog/2019/location-codes-unmapped-hiking-trails + - /blog/2020/what-is-a-nadir + - /blog/2020/gps-101 + ---
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