notebooks/unit05/unit05_02.ipynb

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   "source": [
    "This notebook was prepared by Cayetano Benavent, 2016."
   ]
  },
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   "source": [
    "# Pyproj Geod examples (with GeodesicLinesToGIS library)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Example: creating geodesic lines with library GeodesicLinesToGIS which is using Pyproj Geod module to do computations:"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "https://github.com/GeographicaGS/GeodesicLinesToGIS"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
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   "outputs": [],
   "source": [
    "import os\n",
    "import numpy as np\n",
    "from geodesiclinestogis.geodesicline2gisfile import GeodesicLine2Gisfile"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Coordinates list to compute geodesic lines between origins and destinies:\n",
    "\n",
    "lons_lats: input coordinates. (start longitude, start latitude, end longitude, end latitude)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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    "collapsed": true
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   "source": [
    "coord = [(-6.,37.,-145.,11.),\n",
    "         (-150.,37.,140.,11.),\n",
    "         (-6.,37.,120.,50.),\n",
    "         (-3.6,40.5,-118.4,33.9),\n",
    "         (-118.4,33.9,139.8,35.5),\n",
    "         (-118.4,33.9,104.,1.35),\n",
    "         (-118.4,33.9,151.,-33.9),\n",
    "         (-20.4,33.9,178.,-33.9)\n",
    "        ]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "For faster computations, coordinates list is converted in a NumPy array:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
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   "source": [
    "coord_np = np.array(coord)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Create folder to store layers:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "folderpath = \"/tmp/geod_line\"\n",
    "\n",
    "if not os.path.exists(folderpath):\n",
    "    os.makedirs(folderpath)\n",
    "\n",
    "layername = \"geodesicline\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Run computations:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "gtg = GeodesicLine2Gisfile()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "props = [\"prop01\",\"prop02\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "gtg.gdlToGisFileMulti(coord_np, folderpath, layername, prop=props)"
   ]
  }
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