exercises/1-read_CMEMS_indexfile.ipynb

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   "source": [
    "# Exercise 1: read index file from Copernicus Marine Service - In situ"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The exercise uses the index file from the Mediterranean Sea region ([INSITU_MED_NRT_OBSERVATIONS_013_035](http://marine.copernicus.eu/web/69-interactive-catalogue.php?option=com_csw&view=details&product_id=INSITU_MED_NRT_OBSERVATIONS_013_035)).<br>\n",
    "The index file lists all the available data files with:\n",
    "* their catalog_id,\n",
    "* file_name,\n",
    "* spatial and temporal coverages,\n",
    "* ...\n",
    "\n",
    "The goal is to read such a file and plot the positions of the observations."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Index file"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "If you have an account in Copernicus Marine Service, you can download a new file.<br>\n",
    "Otherwise use the file provided in the *data* directory."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
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   "outputs": [],
   "source": [
    "indexfile = \"../notebooks/data/index_latest.txt\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Read the fields from the file."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Tip: use [genfromtxt](http://docs.scipy.org/doc/numpy/reference/generated/numpy.genfromtxt.html) function.<br>\n",
    "Import the necessary module to use that function."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import numpy as np"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
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   "source": [
    "## Read the coastline corresponding to the Mediterranean Sea"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "coastfile = '../notebooks/data/medsea_coast.npy'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "To read the file, use the [numpy.load](http://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.load.html) funcion."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Simple plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Use matplotlib to plot the positions of the observations.<br>\n",
    "Add the coastline previously read.<br>\n",
    "The command will be something like:\n",
    "\n",
    "*plt.plot(longitude, latitude, 'ko')*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "import matplotlib.pyplot as plt\n",
    "%matplotlib inline"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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