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Python Geospatial Analysis Cookbook

Python Geospatial Analysis Cookbook

By : Diener
4.4 (5)
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Python Geospatial Analysis Cookbook

Python Geospatial Analysis Cookbook

4.4 (5)
By: Diener

Overview of this book

Geospatial development links your data to places on the Earth’s surface. Its analysis is used in almost every industry to answer location type questions. Combined with the power of the Python programming language, which is becoming the de facto spatial scripting choice for developers and analysts worldwide, this technology will help you to solve real-world spatial problems. This book begins by tackling the installation of the necessary software dependencies and libraries needed to perform spatial analysis with Python. From there, the next logical step is to prepare our data for analysis; we will do this by building up our tool box to deal with data preparation, transformations, and projections. Now that our data is ready for analysis, we will tackle the most common analysis methods for vector and raster data. To check or validate our results, we will explore how to use topology checks to ensure top-quality results. This is followed with network routing analysis focused on constructing indoor routes within buildings, over different levels. Finally, we put several recipes together in a GeoDjango web application that demonstrates a working indoor routing spatial analysis application. The round trip will provide you all the pieces you need to accomplish your own spatial analysis application to suit your requirements.
Table of Contents (15 chapters)
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12
A. Other Geospatial Python Libraries
13
B. Mapping Icon Libraries
14
Index

Batch setting the projection definition of a folder full of Shapefiles

Working with one Shapefile is fine but working with tens or hundreds of files is something else. In such a scenario, we'll need automation to get a job done fast.

We have a folder that contains several Shapefiles that are all in the same coordinate system but do not have a .prj file. We want to create a .prj file for each Shapefile in the current directory.

This script is a modified version of the previous code example that could write a .prj file for a single Shapefile into a batch process that can run over several Shapefiles.

How to do it...

We have a folder with many Shapefiles and we would like to create a new .prj file for each Shapefile in this folder, so let's get started:

  1. Create a new Python file named ch02_05_batch_shp_prj.py in your /ch02/code/working/ directory and add the following code:
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    
    import urllib
    import os
    from osgeo import osr
    
    
    def create_epsg_wkt_esri...

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