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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 exporting a list of tables from PostGIS to Shapefiles

We will now change direction and take a look at how we can batch export a list of tables from our PostGIS database into a folder of Shapefiles. We'll again use the ogr2ogr command-line tool from within a Python script so that you can include it in your application programming work flow. Near the end, you can also see how all this works in one single command line.

How to do it...

  1. The following script will fire the ogr2ogr command and loop over a list of tables to export the Shapefile format into an existing folder. So, let's take a look at how to do this as follows:
    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    #
    import subprocess
    import os
    
    # folder to hold output Shapefiles
    destination_dir = os.path.realpath('../geodata/temp')
    
    # list of postGIS tables
    postgis_tables_list = ["bikeways", "highest_mountains"]
    
    # database connection parameters
    db_connection = """PG:host=localhost...

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