shapely_problem.ipynb

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   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "import numpy as np\n",
      "from shapely.geometry import LinearRing"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
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     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lr = LinearRing(pts)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 12
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lr.parallel_offset(distance=2e-3+1e-9)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
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       ],
       "text": [
        "<shapely.geometry.multilinestring.MultiLineString at 0x7f9a042936d8>"
       ]
      }
     ],
     "prompt_number": 15
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "lr.parallel_offset(distance=2e-3)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stderr",
       "text": [
        "TopologyException: assigned depths do not match at 0.1674400049001665 -0.021203263011586794\n"
       ]
      },
      {
       "output_type": "stream",
       "stream": "stderr",
       "text": [
        "ERROR:shapely.geos:TopologyException: assigned depths do not match at 0.1674400049001665 -0.021203263011586794\n"
       ]
      },
      {
       "ename": "ValueError",
       "evalue": "No Shapely geometry can be created from null value",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
        "\u001b[0;32m<ipython-input-16-4ff78982a218>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mlr\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mparallel_offset\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mdistance\u001b[0m\u001b[0;34m=\u001b[0m\u001b[0;36m2e-3\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[0;32m/home/jonathan/.local/lib/python3.5/site-packages/shapely/geometry/linestring.py\u001b[0m in \u001b[0;36mparallel_offset\u001b[0;34m(self, distance, side, resolution, join_style, mitre_limit)\u001b[0m\n\u001b[1;32m    139\u001b[0m         \u001b[0;32mtry\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    140\u001b[0m             return geom_factory(self.impl['parallel_offset'](\n\u001b[0;32m--> 141\u001b[0;31m                 self, distance, resolution, join_style, mitre_limit, side))\n\u001b[0m\u001b[1;32m    142\u001b[0m         \u001b[0;32mexcept\u001b[0m \u001b[0mOSError\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m    143\u001b[0m             \u001b[0;32mraise\u001b[0m \u001b[0mTopologicalError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;32m/home/jonathan/.local/lib/python3.5/site-packages/shapely/geometry/base.py\u001b[0m in \u001b[0;36mgeom_factory\u001b[0;34m(g, parent)\u001b[0m\n\u001b[1;32m     63\u001b[0m     \u001b[0;31m# Abstract geometry factory for use with topological methods below\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     64\u001b[0m     \u001b[0;32mif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0mg\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 65\u001b[0;31m         \u001b[0;32mraise\u001b[0m \u001b[0mValueError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"No Shapely geometry can be created from null value\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     66\u001b[0m     \u001b[0mob\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mBaseGeometry\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     67\u001b[0m     \u001b[0mgeom_type\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mgeometry_type_name\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mg\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
        "\u001b[0;31mValueError\u001b[0m: No Shapely geometry can be created from null value"
       ]
      }
     ],
     "prompt_number": 16
    }
   ],
   "metadata": {}
  }
 ]
}