By Bill Kropla
Starting MapServer: Open resource GIS improvement is the 1st ebook of its type. It bargains a finished advent to MapServer, the advance platform for integrating mapping expertise into net purposes. you will construct and expand dynamic purposes utilizing well known languages like Hypertext Preprocessor, Perl, and Python.After an intensive advent to set up and configuration, you will discover uncomplicated MapServer subject matters and examples. you are going to additionally find out about complex MapServer beneficial properties, and the way to question and contain dynamic information into your software. The ebook culminates with the production of a precise mapping program.
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Fm Page 23 Tuesday, July 19, 2005 12:14 PM CHAPTER 2 ■ SIMPLE MAPSERVER EXAMPLES Figure 2-2. The “Hello World” image Common errors at this stage could involve incorrectly set permissions on the directories created earlier, typos in the mapfile or template file, or forgotten libraries for rendering PNG images. Be aware that the geographical extent specified is strictly observed by MapServer. 0) isn’t within the extent, then the point won’t be rendered. 00), so the point is within the extent and will be drawn.
The keyword NAME defines the string that will be prefixed to the names of the images that MapServer creates. The longer the NAME string, the more unwieldy the directory listings will be—so, when naming your own mapfiles in the future, remember to keep them short. Also, keep in mind any operating system limitations on file names that might exist. 00 The keyword SIZE in Line 03 specifies the dimensions (in pixels) of the final map image. IMAGECOLOR defines the background color for the map image, and the keyword IMAGETYPE specifies the format of the map image.
This is discussed in more detail in the next chapter. The NAME is limited to 20 characters. shp) of the shapefile to be rendered in this layer. The value associated with keyword DATA is actually the relative path from the SHAPEPATH noted previously. The STATUS of a layer can assume one of three values: OFF, ON, or DEFAULT. If a layer’s STATUS is ON, the layer will be rendered; if it’s OFF, then the layer won’t be rendered. If STATUS is either OFF or ON, it can be changed to its opposite by the appropriate response from the web form.