June 2005
Beginner to intermediate
372 pages
10h 1m
English
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Setting Output Image Formats
MapServer can produce map images, legends, and scale bars in different image formats. Throughout this chapter, the PNG format is shown in the examples because it is the default image format. MapServer packages can have different default image formats. PNG format is commonly supported by many MapServer packages, but in some cases MapServer may not be able to produce PNG files or doesn't produce them by default.
Tip
MapServer can be compiled using many different options. The term
"MapServer package" refers to the set of programs, e.g., shp2img, that you are using. The
capabilities of these programs depend on how they are compiled. Some
packages will have more features enabled than others.
The output image format can be explicitly set in the map file. This requires adding a single line specifying the output format you are requesting. Example 10-11 shows the additional line added to the earlier example map file.
Example 10-11. Specifying the output image format as JPEG
MAP
SIZE 600 300
EXTENT -180 -90 180 90
IMAGECOLOR 180 180 250
IMAGETYPE JPEG
UNITS DD
...This setting can be overridden when using the shp2img command with the -i option. It can't be overridden when using
commands such as scalebar or legend, as mentioned earlier in "Creating Your
First Map Image."
The IMAGETYPE specified must be
one supported by the MapServer package you are running. To check what
output formats your installation supports, run the mapserv file (or mapserv.exe on Windows) with ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.