exercises/3-plot_radar_velocity.ipynb

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   "source": [
    "# Exercise 3: plot currents in the Gulf of Cádiz"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The goal is to represent the latest (i.e. most recent) velocity field from a HF radar system managed by Puertos del Estado."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Import"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import ...\n",
    "import ...\n",
    "%matplotlib inline"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "# Data"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Find the data URL by browsing the [thredds directory](http://opendap.puertos.es/thredds/catalog.html). Select the file corresponding to the current month. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
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   "outputs": [],
   "source": [
    "datafile = \" \""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Read the variables"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The variables to read are:\n",
    "* the 2 components of the velocity\n",
    "* the coordinates\n",
    "* the time."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
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    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-3-825f8fedf849>, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-3-825f8fedf849>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    with ... as ...:\u001b[0m\n\u001b[1;37m         ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
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   ],
   "source": [
    "with ... as ...:"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Make the plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Projection"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Create a Mercator projection around the area of interest.<br>\n",
    "Don't forget to import the [Basemap](http://matplotlib.org/basemap/) toolkit."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Compute the coordinates in the new projection."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Velocity field"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Represent the most recent velocity field.<br>\n",
    "**Hints:** \n",
    "* remember the index corresponding to the last element of a list or of an array is [-1],\n",
    "* use [quiver](http://matplotlib.org/examples/pylab_examples/quiver_demo.html) to represent the velocity field. You can have all the arrows in the same color."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "fig = plt.figure()\n",
    "\n",
    "\n",
    "plt.show()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Don't forget to add:\n",
    "* the coastline\n",
    "* a land mask,\n",
    "* a reference vector,\n",
    "* a map scale."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Subsidiary question"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "* Make a similar figure, but now change the color of the arrows according to the current intensity.\n",
    "* Add a title containing the date corresponding to the time of the measurements."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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