Book Image

GeoServer Beginner's Guide

Book Image

GeoServer Beginner's Guide

Overview of this book

GeoServer is an open source server-side software written in Java that allows users to share and edit geospatial data. Designed for interoperability, it publishes data from any major spatial data source using open standards. GeoServer allows you to display your spatial information to the world. Implementing the Web Map Service (WMS) standard, GeoServer can create maps in a variety of output formats. OpenLayers, a free mapping library, is integrated into GeoServer, making map generation quick and easy. GeoServer is built on Geotools, an open source Java GIS toolkit.GeoServer Beginner's Guide gives you a kick start to build custom maps using your data without the need for costly commercial software licenses and restrictions. Even if you do not have prior GIS knowledge, you will be able to make interactive maps after reading this book.You will install GeoServer, access your data from a database, style points, lines, polygons, and labels to impress site visitors with real-time maps.Follow along through a step-by-step guide that installs GeoServer in minutes. Explore the web-based administrative interface to connect to backend data stores such as MySQL, PostGIS, MSSQL, and Oracle. Display your data on web-based interactive maps, style lines, points, polygons, and embed images to visualize this data for your web visitors. Walk away from this book with a working application ready for production.After reading the GeoServer Beginner's Guide, you will have beautiful, custom maps on your website built using your geospatial data.
Table of Contents (20 chapters)
GeoServer Beginner's Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – seeding a layer


As of now we have used the GeoWebCache for storing tiles produced by user request. Of course following requests with equal parameters will hit the cache and GeoServer won't render a new map for them.

But you can also pre-calculate the tiles for a layer to avoid some users experiencing a delay when requesting zoom levels and areas not yet cached.

The process of pre-calculating tiles is called seeding . This section will guide you to understand how it works.

  1. Go to the Tile layers page and look for the tl_2011_us_county layer. Click on the Seed/Truncate link for it:

  2. A new page will open. The GeoWebCache seeding is not integrated in the GeoServer web interface. What you see is the GeoWebCache interface:

  3. Scroll to the Create a new task section. You have to set the parameters for the seeding. The first one is the number of parallel processes, that is, threads that will request maps to GeoServer. As we have a single GeoServer instance, there is no gain in running too...