notebooks/unit06/unit06_01.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "This notebook was prepared by Cayetano Benavent, 2016."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Vector analysis with GDAL (OGR)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Vector analysis examples with OGR:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from osgeo import ogr"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "geol_fl = \"../../data/geologia_marina/mm01_geologia.shp\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Reading a dataset:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "ds = ogr.Open(geol_fl, 0)\n",
    "if ds is None:\n",
    "    print('Error opening file')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "lyr = ds.GetLayer(0)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "feat = lyr.GetFeature(0)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "geom = feat.geometry()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'POLYGON ((567254.032220158609562 4070819.703356473241001,567066.027517820475623 4070784.703918096609414,566908.523573090322316 4070755.704370033927262,566777.520383623195812 4070732.705026592127979,566669.017446592450142 4070715.705301819369197,566579.015369430184364 4070702.705511461943388,566503.51334315049462 4070694.705768123734742,566438.261767981224693 4070689.706087985541672,566379.697651266353205 4070687.706282938830554,566324.071095415740274 4070688.70636547030881,566270.694782679202035 4070692.706537948455662,566219.193313801777549 4070697.706803479231894,566169.504576872102916 4070705.706960550043732,566121.253172550350428 4070714.707012208178639,566074.377094121067785 4070725.707257832866162,566028.563138626515865 4070737.70739934919402,565983.561894499929622 4070751.707536775618792,565939.24816873727832 4070765.707572218496352,565895.559554630424827 4070780.707805067766458,565852.370748955174349 4070796.707935762125999,565809.682256800937466 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4072669.261553768999875,565700.732645752490498 4072647.706903103273362,565721.170679576811381 4072624.706944794859737,565741.23389920592308 4072602.706987298559397,565759.671867826837115 4072582.706934458110482,565775.172557052923366 4072563.706791916396469,565798.048169160610996 4072537.706827726680785,565818.673709359602071 4072514.706669719424099,565838.736930547165684 4072492.706613191403449,565854.737428472260945 4072474.70656862296164,565873.487906703026965 4072454.706615658476949,565893.551133821485564 4072431.706460494548082,565914.864382950006984 4072410.706499262247235,565936.739856886910275 4072387.706337834708393,565959.99076113733463 4072365.706370732747018,565982.678851410397328 4072343.70630592526868,566004.492114629712887 4072322.706143698189408,566023.242684728116728 4072304.706090328749269,566039.868200862198137 4072286.706044883932918,566059.181111411890015 4072263.705994063988328,566078.056900854222476 4072242.706043301615864,566094.682322848238982 4072223.705899175256491,566112.182867416529916 4072204.705752005800605,566130.746054823044688 4072182.705803751479834,566148.559013034682721 4072162.705756640993059,566166.684489819570445 4072140.705710324458778,566186.49781521758996 4072117.705558965913951,566205.37331177550368 4072095.705610305070877,566222.186350678908639 4072074.705668374430388,566239.499307821504772 4072052.705425700172782,566255.249925239942968 4072030.705388815607876,566365.0521129994886 4071901.440513588953763,566373.218372798757628 4071891.826793371234089,566471.006788180209696 4071776.705053976736963,566518.508357210783288 4071729.704830934759229,566536.00882364588324 4071707.704790364950895,566552.884268976165913 4071686.704651199746877,566576.76003186381422 4071658.704694392625242,566591.510707151377574 4071640.704660127870739,566608.198643152252771 4071620.704621151089668,566627.261661878437735 4071596.704677940811962,566643.512292467872612 4071575.704541797284037,566659.700432374025695 4071552.704408002085984,566681.263632507412694 4071525.70455962466076,566701.701704041683115 4071498.704415414948016,566720.514923323062249 4071473.704275083262473,566740.765390774235129 4071446.704331992659718,566759.578605376998894 4071422.704391079954803,566780.704274641233496 4071399.704241371247917,566802.767579261562787 4071374.704090684186667,566822.268112645135261 4071350.704048037528992,566840.081097330199555 4071327.704210369382054,566859.206827083020471 4071302.704070441890508,566876.707304295734502 4071279.703934220597148,566893.707974286749959 4071255.704000924248248,566910.895943987183273 4071232.704066127538681,566925.584027493256144 4071213.703935843892395,566942.272168441326357 4071193.70389992184937,566962.585219887783751 4071170.703854980878532,566985.523456077324226 4071144.703804512973875,567007.77406393410638 4071120.703754510730505,567029.21232921036426 4071100.703803225886077,567053.275590298813768 4071075.703648627270013,567073.02632892539259 4071052.703506684396416,567091.58935353346169 4071026.703472186345607,567108.777320769615471 4071004.703538183588535,567125.090576571645215 4070980.703509459272027,567142.278555383556522 4070956.703477975912392,567159.904051384306513 4070931.703346305061132,567177.90484640316572 4070908.703511378262192,567196.217949843616225 4070885.703375592827797,567215.530879599740729 4070862.703236668370664,567233.531458876794204 4070842.703198968432844,567254.032220158609562 4070819.703356473241001))'"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "geom.ExportToWkt()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Computing geometry centroid:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'POINT (565765.987489471328445 4071741.848770559765399)'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "geom.Centroid().ExportToWkt()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Computing geometry area:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3144407.583156267"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "geom.Area()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Computing buffer geometry at a given distance:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "dist = 10000 # meters\n",
    "buff = geom.Buffer(dist)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Check if it is valid geometry:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "buff.IsValid()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'POLYGON ((554958.181719859130681 4070803.407912525348365,554908.607498328899965 4071107.47160325711593,554903.607297812588513 4071144.471400127280504,554848.903359632240608 4071643.266698976512998,554819.289265858475119 4072144.178144699893892,554817.726510717067868 4072190.178323573898524,554813.446554338559508 4072702.08802038943395,554835.369689669809304 4073213.545967690180987,554839.619407290709205 4073275.545815479010344,554874.560882745776325 4073670.414971144869924,554925.124920536880381 4074063.589022788219154,554937.624844177276827 4074147.589026476722211,555025.186105728847906 4074648.249759775586426,555048.12365220207721 4074762.249405618291348,555125.942138013197109 4075115.789710451848805,555161.817340264911763 4075265.789583918172866,555221.70876285538543 4075503.307452604640275,555272.89674424752593 4075696.307137890718877,555319.364129134453833 4075865.503653231076896,555388.114612216711976 4076107.503134029451758,555542.816748711979017 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      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "buff.ExportToWkt()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "buff_bd = buff.Boundary()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
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