June 2005
Beginner to intermediate
372 pages
10h 1m
English
Content preview from Web Mapping IllustratedBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Create a Custom Application for a Particular Area
MapServer has many different settings you will want to learn more about as you develop your skills. A very small, core subset of options are used in the examples in this chapter. For a complete listing of map file settings, see the map file reference document at http://mapserver.gis.umn.edu/doc/mapfile-reference.html.
Also note that there are several MapServer CGI variables used in this chapter. For more information see the current MapServer CGI reference document at http://mapserver.gis.umn.edu/doc/cgi-reference.html.
Changing the Initial Extent of the Map
In Chapter 10
you learned how to change the extents of the map when using the
shp2img command-line utility. With
an interactive map the extents can be changed by zooming in, just like
the test example with the global map application. The initial map
shown by that application covers the whole world. If you are
interested only in a map covering a certain area, you will want to
change the initial extent of the map to suit your area of
interest.
You will continue to build on the previous examples in this
chapter, including the global.map file. The
EXTENT line in the map file
specifies what the initial extent of the map will be when MapServer
starts up. This was set to:
EXTENT -180 -90 180 90
which covers the whole world. Now you will set this to zoom in
to a new area, to make a map of Canada. You will do so by continuing
to use the countries_simpl.shp shapefile, and
also use the ogr2ogr ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.