Book Image

Python Geospatial Development

By : Erik Westra
Book Image

Python Geospatial Development

By: Erik Westra

Overview of this book

<p>Open Source GIS (Geographic Information System) is a growing area with the explosion of applications such as Google Maps, Google Earth, and GPS. The GIS market is growing rapidly and as a Python developer you will find yourself either wanting grounding in GIS or needing to get up to speed to do your job. In today's location-aware world, all commercial Python developers can benefit from an understanding of GIS development gained using this book.</p> <p>Working with geo-spatial data can get complicated because you are dealing with mathematical models of the Earth's surface. Since Python is a powerful programming language with high-level toolkits, it is well suited to GIS development. will familiarize you with the Python tools required for geo-spatial development such as Mapnik, which is used for mapping in Python. It introduces GIS at the basic level with a clear, detailed walkthrough of the key GIS concepts such as location, distance, units, projections, datums, and GIS data formats. We then examine a number of Python libraries and combine these with geo-spatial data to accomplish a variety of tasks. The book provides an in-depth look at the concept of storing spatial data in a database and how you can use spatial databases as tools to solve a variety of geo-spatial problems. <br /><br />It goes into the details of generating maps using the Mapnik map-rendering toolkit, and helps you to build a sophisticated web-based geo-spatial map-editing application using GeoDjango, Mapnik, and PostGIS. By the end of the book, you will be able to integrate spatial features into your applications and build a complete mapping application from scratch.</p>
Table of Contents (19 chapters)
Python Geospatial Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Web application concepts


In this section, we will examine a number of important concepts related to web-based application development in general, as well as concepts specific to developing geo-spatial applications that are accessed via a web server.

Web application architecture

There are many ways you can approach the development of a web-based application. You can write your own code by hand, for example as a series of CGI scripts, or you can use one of the many web application frameworks that are available. In this section, we will look at the different ways web applications can be structured so that the different parts work together to implement the application's functionality.

A bare-bones approach

In Chapter 7, we created a simple web application named DISTAL. This web application was built using CGI scripts to provide distance-based identification of towns and other features. DISTAL is a good example of a "bare bones" approach to web application development, using nothing more than a web...