Beginning MapServer: Open Source GIS Development by Bill Kropla

By Bill Kropla

Starting MapServer: Open resource GIS improvement is the 1st ebook of its type. It deals a accomplished creation to MapServer, the improvement platform for integrating mapping expertise into web functions. you will how to construct and expand dynamic functions utilizing well known languages like Hypertext Preprocessor, Perl, and Python.After a radical creation to set up and configuration, you will discover simple MapServer themes and examples. you are going to additionally find out about complicated MapServer positive aspects, and the way to question and comprise dynamic info into your software. The e-book culminates with the construction of a precise mapping software.

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The shapefile used in this example is a polygon. However, the layer will be defined as a line type in order to render only the state boundaries. This will cause the labels to be located at the edge of each state (one remedy for this involves using an annotation layer, which will be presented in Chapter 4). Associated with a shapefile is a database file. Each feature in a shapefile has a corresponding record in the database. This record contains descriptive information associated with the feature.

Make the directory readable and executable by the webserver user (usually nobody), as follows: mkdir /home/mapdata chown nobody:nobody /home/mapdata chmod u+rx /home/mapdata You’ll be putting some shapefiles in this directory later. • images. Whenever MapServer creates a map, it saves the image (or images) to a file. This file must be accessible to MapServer and the Apache server. To enable this, create a directory named tmp in the Apache DocumentRoot. fm Page 13 Friday, July 15, 2005 7:28 AM CHAPTER 1 ■ BUILDING MAPSERVER The configuration is as simple as that.

In a MapServer context, this is accomplished by the initialization file. In a CGI MapServer application, the initialization file is a conventional HTML form with the initialization information hard-coded into form variables. Almost any value that MapServer uses can be set in the initialization file. map extension). It then reads the mapfile to locate fonts, symbols, templates, and spatial data. The mapfile also specifies the size of the resulting map, its geographical extent, and whether it’s in GIF, JPEG, or PNG format.

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