On 8/23/2011 8:56 PM, jjwang wrote:
OK, a simple question.
The data I have is in WGS84. What I need is a map in Mercator projeciton.
So what should I do?
Define the projection under the 'MAP' or under the 'Layer'?
Someone answer me please.
JJ,
You need both.
the projection block under the MAP is what you want the output
projection to be, like:
PROJECTION
"init=epsg:900913"
END
UNITS meters
EXTENTS -20037508.3427892480 -20037508.3427892480 20037508.3427892480
20037508.3427892480
And then in your LAYER block you need to define the projection of the
data that is in the source for that layer. In your case WGS84, so:
LAYER
...
PROJECTION
"init=epsg:4326"
END
...
END
And if your do not already have 900913 added to your proj4 epsg file
then you need to add the following to that file with a command like:
echo "<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0
+x_0=0.0 +y_0=0 +k=1.0 +units=m +over +nadgrids=@null +no_defs <>" >>
/usr/share/proj/epsg
This would set you up for the Google Spherical Mercator project. If you
want another projection the look through the epsg file and you might
find it already defined there.
-Steve W
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