Book Image

Python Geospatial Development - Second Edition - Second Edition

By : Erik Westra
Book Image

Python Geospatial Development - Second Edition - Second Edition

By: Erik Westra

Overview of this book

Geospatial development links your data to places on the Earth's surface. Writing geospatial programs involves tasks such as grouping data by location, storing and analyzing large amounts of spatial information, performing complex geospatial calculations, and drawing colorful interactive maps. In order to do this well, you'll need appropriate tools and techniques, as well as a thorough understanding of geospatial concepts such as map projections, datums and coordinate systems. Python Geospatial Development - Second Edition teaches you everything you need to know about writing geospatial applications using Python. No prior knowledge of geospatial concepts, tools or techniques is required. The book guides you through the process of installing and using various toolkits, obtaining geospatial data for use in your programs, and building complete and sophisticated geospatial applications in Python. Python Geospatial Development teaches you everything you need to know about writing geospatial applications using Python. No prior knowledge of geospatial concepts, tools or techniques is required. The book guides you through the process of installing and using various toolkits, obtaining geospatial data for use in your programs, and building complete and sophisticated geospatial applications in Python. This book provides an overview of the major geospatial concepts, data sources and toolkits. It teaches you how to store and access spatial data using Python, how to perform a range of spatial calculations, and how to store spatial data in a database. Because maps are such an important aspect of geospatial programming, the book teaches you how to build your own “slippy map” interface within a web application, and finishes with the detailed construction of a geospatial data editor using Geodjango. Whether you want to write quick utilities to solve spatial problems, or develop sophisticated web applications based around maps and geospatial data, this book includes everything you need to know.
Table of Contents (18 chapters)
Python Geospatial Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Chapter 11. ShapeEditor – Selecting and Editing Features

In this final chapter, we will implement the remaining features of the ShapeEditor application. A large part of this chapter will involve the use of OpenLayers and the creation of a Tile Map Server so that we can display a map with all the shapefile's features on it, and allow the user to click on a feature to select it. We'll also implement the ability to add, edit, and delete features, and conclude with a exploration of how the ShapeEditor can be used to work with geospatial data, and how it can serve as the springboard for your own geospatial development efforts.

In this chapter, we will learn:

  • How to implement a Tile Map Server using Mapnik and GeoDjango

  • How to use OpenLayers to display a slippy map on a web page

  • How to write a custom click-handler for OpenLayers

  • How to use AJAX requests within OpenLayers

  • How to perform spatial queries using GeoDjango

  • How to use GeoDjango's built-in editing widgets in your own application

  • How to edit geospatial...