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<font face="InaiKathir">Hi all,<br><br>
To give a better idea about what I am trying to acheive, I have explained
little bit more in this mail than before. I wanted the mapserver to
generate the image of USA in the "lcc : Lambert Conformal Conic
projection" or "aea : Albers Equal Area" or which ever
suits best for US. I have the National Atlas US States shapefile
statesp020.xxx . The following is the map file.<br><br>
NAME USA <br>
STATUS ON <br>
EXTENT -126 50 -66 24 <br>
UNITS METERS <br>
SIZE 700 550 <br>
SHAPEPATH "data" <br>
IMAGECOLOR 79 173 253<br><br>
PROJECTION <br>
<x-tab> </x-tab>"proj=lcc"
<br>
<x-tab> </x-tab>"lat_0=24"
<br>
<x-tab> </x-tab>"lat_1=50"
<br>
<x-tab> </x-tab>"lon_0=-99"
<br>
END<br><br>
WEB <br>
<x-tab> </x-tab>TEMPLATE
demo.html <br>
<x-tab> </x-tab>LOG
demo.log <br>
END<br><br>
# <br>
# Start of symbol definitions (we're only using a few) <br>
# <br>
SYMBOL <br>
<x-tab> </x-tab>NAME
'circle' <br>
<x-tab> </x-tab>TYPE
ELLIPSE <br>
<x-tab> </x-tab>POINTS 1 1
END <br>
<x-tab> </x-tab>FILLED
TRUE <br>
END<br><br>
# <br>
# Start of layer definitions <br>
#<br>
LAYER <br>
<x-tab> </x-tab>NAME
statesp020 <br>
<x-tab> </x-tab>MAXSCALE
600000 <br>
<x-tab> </x-tab>TYPE
POLYGON <br>
<x-tab> </x-tab>STATUS
DEFAULT <br>
<x-tab> </x-tab>DATA
statesp020 <br>
<x-tab> </x-tab>PROJECTION
<br>
<x-tab> </x-tab><x-tab> </x-tab>"proj=latlong"
<br>
<x-tab> </x-tab><x-tab> </x-tab>"ellps=clrk66"
<br>
<x-tab> </x-tab>END<br><br>
<x-tab> </x-tab>CLASSITEM
'state' <br>
<x-tab> </x-tab>CLASS
<br>
<x-tab> </x-tab><x-tab> </x-tab>NAME
'Unwanted States' <br>
<x-tab> </x-tab><x-tab> </x-tab>EXPRESSION
/'Virgin Island'|Puerto|Alaska/ <br>
<x-tab> </x-tab><x-tab> </x-tab>OUTLINECOLOR
198 243 255 <br>
<x-tab> </x-tab><x-tab> </x-tab>COLOR
198 243 255 <br>
<x-tab> </x-tab>END <br>
<x-tab> </x-tab>CLASS
<br>
<x-tab> </x-tab><x-tab> </x-tab>NAME
'State & Nation Boundary' <br>
<x-tab> </x-tab><x-tab> </x-tab>EXPRESSION
/./ <br>
<x-tab> </x-tab><x-tab> </x-tab>OUTLINECOLOR
180 180 180 <br>
<x-tab> </x-tab><x-tab> </x-tab>COLOR
255 255 255 <br>
<x-tab> </x-tab><x-tab> </x-tab>OVERLAYSYMBOL
'circle' <br>
<x-tab> </x-tab><x-tab> </x-tab>OVERLAYSIZE
2 <br>
<x-tab> </x-tab><x-tab> </x-tab>OVERLAYOUTLINECOLOR
180 180 180 <br>
<x-tab> </x-tab>END<br><br>
<x-tab> </x-tab>TOLERANCE
0 <br>
END<br><br>
END<br><br>
In the Map PROJECTION Section when I change the above shown on to
proj=latlong and remove lat_0 and other stuff, then the map shows up
correctly. But, when I have it as shown above, I just only see an image
with solid image color. Can someone tell me where I am making mistake
?<br><br>
Thanks <br>
Sathis<br><br>
Kieran J. Ames wrote:<br><br>
Sathis, <br>
I'll share the little I know with you. <br>
You need to investigate projections in general. Different projections
render <br>
maps in different ways. If you have ArcView (what I use), you can take
your <br>
UNPROJECTED DATA (Decimal Degrees) and PROJECT it. This will allow you to
see <br>
what happens. If you can't do that, then you might post to the group and
ask <br>
them what the best projection for this would be. <br>
eg: if you want to show North America and NOT zoom in, you may choose one
<br>
projection over another. Tell the group what you want to accomplish and
go from <br>
there. <br>
HTH. <br>
Kieran<br>
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