Book Image

OpenLayers 2.10 Beginner's Guide

Book Image

OpenLayers 2.10 Beginner's Guide

Overview of this book

Table of Contents (18 chapters)
OpenLayers 2.10
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Format class


The Format class is used to serialize and deserialize feature data. There are just two properties, a few methods, and a list of valid subclasses we should quickly cover.

Format class properties

You'll often run into a situation where you have a data file that is in a different projection than your map. For instance, if you are using a spherical Mercator projection for your map and the data is in EPSG:4326, you'll need to set the following two properties so that OpenLayers can transform the projection.

  • externalProjection: {OpenLayers.Projection} This specifies the projection that the data is in.

  • internalProject: {OpenLayers.Projection} This specifies the projection that the map (or the geometries that will be returned) is in.

    Note

    By default, you can only use the spherical Mercator and EPSG:4326 projections. If you wish to use a different projection, you will need to include the Proj4js library, which was covered in more detail in Chapter 4.

Format class methods

There are two primary...