exercises/2-plot_ibiza_temperature_salinity.ipynb

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   "source": [
    "# Exercise 2: plot time series of temperature and salinity "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The goal of the exercise it to read data from a mooring located in the [Ibiza Channel](http://socib.es/?seccion=observingFacilities&facility=mooring&id=146) and represent the temperature and salinity corresponding to December 2015. "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Import packages"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Add packages that you will need:\n",
    "* netCDF\n",
    "* numpy\n",
    "* ..."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "# add modules \n",
    "# here\n",
    "\n",
    "# to have the figure inside the notebook\n",
    "%matplotlib inline \n",
    "\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Read data"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "Browse the [thredds directory](http://thredds.socib.es/thredds/catalog/mooring/conductivity_and_temperature_recorder/buoy_canaldeibiza-scb_sbe37006/catalog.html) to find the correct file.\n",
    "\n",
    "Copy and paste below the data URL.\n",
    "\n",
    "**Hint:** the link should be something like: http://thredds.socib.es /thredds/dodsC/mooring/conductivity_and_temperature_recorder/buoy_canaldeibiza-scb_sbe37006/ ... nc"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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    "collapsed": true
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   "outputs": [],
   "source": [
    "datafile = \" \""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Read variables"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The variables to be used are:\n",
    "* temperature\n",
    "* salinity\n",
    "* time\n",
    "\n",
    "To avoid to have to close the file, use the contruction [with ... as ...](https://docs.python.org/2/reference/compound_stmts.html#the-with-statement). <br>\n",
    "There is an example in the notebook: *Data_ReadWrite/read_netcdf_opendap.ipynb* "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Check the dimension of the arrays where the data are stored."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Make the plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The figure will be made up of two subplot, one over the other.<br>\n",
    "See examples in the notebook *Plotting/plot_subfigure.ipynb*."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "## 1st plot: basic plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "fig = figure()\n",
    "...\n",
    "..."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 2nd plot: improved plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Create a new figure adding:\n",
    "* a title\n",
    "* x- and ylabels\n",
    "* the units.\n",
    "\n",
    "**Hint:** use change the [*num2date*](http://netcdf4-python.googlecode.com/svn/trunk/docs/netcdftime.netcdftime-module.html#num2date) function to change time format using the *units* attribute of the variable."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "fig = figure()\n",
    "...\n",
    "..."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Subsidiary questions"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## cf-python"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Instead of using netcdf4 to read the file, use [cf-python](http://cfpython.bitbucket.org/).\n",
    "You may have to install it on your machine."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Min and max values"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Compute the dates when the minimal and maximal values of salinity occur."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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