MapServer Documentation, Release 5.4.0
2.3.4 Skills
In addition to learning how the different components of a MapServer application work together and learning Map File
syntax, building a basic application requires some conceptual understanding and proficiency in several skill areas.
You need to be able to create or at least modify
HTML pages and understand how HTML forms work. Since the
primary purpose of a MapServer application is to create maps, you will also need to understand the basics of geographic
data and likely, map projections. As your applications get more complex, skills in SQL, DHTML/Javascript, Java,
databases, expressions, compiling, and scripting may be very useful.
2.4 Introduction to the Mapfile
The .map file is the basic configuration file for data access and styling for MapServer. The file is an ASCII text file,
and is made up of different objects. Each object has a variety of parameters available for it. All .map file (or mapfile)
parameters are documented in the mapfile reference. A simple mapfile example displaying only one layer follows, as
well as the map image output:
NAME "sample"
STATUS ON
SIZE 600 400
SYMBOLSET "../etc/symbols.txt"
EXTENT -180 -90 180 90
UNITS DD
SHAPEPATH "../data"
IMAGECOLOR 255 255 255
FONTSET "../etc/fonts.txt"
#
# Start of web interface definition
#
WEB
IMAGEPATH "/ms4w/tmp/ms_tmp/"
IMAGEURL "/ms_tmp/"
END
#
# Start of layer definitions
#
LAYER
NAME ’global-raster
TYPE RASTER
STATUS DEFAULT
DATA b l u e m a r b le.gif
END
Note:
• Comments in a mapfile are specified with a ‘#’ character
• MapServer parses mapfiles from top to bottom, therefore layers at the end of the mapfile will be drawn last
(meaning they will be displayed on top of other layers)
• Using relative paths is always recommended
• Paths should be quoted (single or double quotes are accepted)
14 Chapter 2. An Introduction to MapServer
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