Bill Kropla's Beginning MapServer: Open Source GIS Development PDF

By Bill Kropla

Starting MapServer: Open resource GIS improvement is the 1st ebook of its style. It deals a accomplished advent to MapServer, the advance platform for integrating mapping expertise into net purposes. you will how to construct and expand dynamic functions utilizing renowned languages like Hypertext Preprocessor, Perl, and Python.After an intensive creation to set up and configuration, you will discover uncomplicated MapServer issues and examples. you will additionally know about complicated MapServer positive factors, and the way to question and include dynamic information into your program. The booklet culminates with the production of an exact mapping software.

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It maintains state by saving parameters in input fields. While the initialization task can be performed by a stand-alone web page, it’s simpler in many cases to embed initial values in the template file and update these values in subsequent invocations. In keeping with the goal of absolute simplicity in this chapter, the initial values are embedded in the template file. html in /var/www/htdocs/ (or whichever directory is specified as DocumentRoot). html and press Enter. html: Could not connect to host localhost you’ve forgotten to start your Apache server.

You might, for example, keep your files outside the Apache tree and just create symlinks to them. In a production environment, you’d also want to pay a lot more attention to permissions—but this is an experimental environment, so you can get away with the slack security. ■Note In the example environment, the Apache DocumentRoot is /var/www/htdocs/. You now have a functioning MapServer executable, you’ve created the appropriate directories to put shapes and images in, you know where the fonts are, and you have a set of symbols.

For simplicity, only a color is defined in this case. The STYLE object is terminated by the keyword END. The COLOR keyword determines the color in which the feature is drawn by specifying its RGB components. These are integer values in the range of 0 to 255. Here, the feature has been rendered as a red dot with the default size of 1 pixel. A class can also contain a LABEL object. The LABEL object is rendered with the class, and specifies the font type, size, and color of the label. Labels can be more complex than this, and they’ll be discussed in more detail later in the book.

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