Hi. I posted last week about trying to get an image that I already have to
be displayed on a layer with help from a world file. That all works. Now, I
have new questions.
My world file is using the UTM projection. The tricky part now is that I
need to specify in my map file the extent in latitudes and longitudes. I have
the appropriate geocodes, and I know that a world file and extent are lower
left x,y then top right x,y and that an image is top left x,y then bottom right
x,y. So I have all that compensated for, otherwise I wouldn't have gotten it
working in meters for UTM as my extent. I've tried entering in the geocodes as
the extent for the MAP object. That didn't work. So, I figured "I'm using UTM
in my world file. Maybe I need to specify latlong projection for the MAP
object." That didn't work either. I then tried adding that same projection to
the one layer that I have. No luck. The image comes up blank once again. And
yes, I've read the section on rasters.
My questions:
How do I switch from using Meters as my extent to geocodes?
Do I need to use UTM for my world file? Every example I've seen on the net
uses UTM. I've tried geocodes for the world file, but gdalinfo <image>
indicates that the corner coordinates are totally off.
The .php file is nothing special or elaborate. It just simply creates the
image and draws it.
My world file:
1
0.0000000000
0.0000000000
-1
393898.00
4438945.00
My map file (I have the projections commented out as well as the EXTENT in
METERS that worked)
MAP
NAME UniversityOfIllinois
STATUS ON
SIZE 1747 1916
IMAGETYPE GIF #image is 1747 X 1916 pixels
#PROJECTION
# "proj=latlong"
# "ellps=WGS84"
# "datum=NAD83"
#END
#EXTENT 393897.50 4437029.50 395644.50 4438945.50
#UNITS METERS
EXTENT 40.071888 -88.244698 40.094110 -88.217468
SHAPEPATH "/var/www/mapserver/basic/data/illinois/"
IMAGECOLOR 255 255 255
OUTPUTFORMAT
NAME thegif
DRIVER "GD/GIF"
MIMETYPE "image/gif"
IMAGEMODE RGB
EXTENSION "gif"
END
OUTPUTFORMAT
NAME thepng
DRIVER "GD/PNG"
MIMETYPE "image/png"
IMAGEMODE PC256
EXTENSION "png"
END
WEB
IMAGEPATH "/var/www/mapserver/basic/images/"
IMAGEURL "/mapserver/basic/images/"
END
LAYER
NAME "UofI"
DATA "colorUofIllinois.gif"
TYPE RASTER
STATUS DEFAULT
#PROJECTION
# "proj=latlong"
# "ellps=WGS84"
# "datum=NAD83"
#END
END
END
Any extra info needed:
MapServer version 4.10.0 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=WMS_SERVER
SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER
SUPPORTS=THREADS SUPPORTS=GEOS INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR INPUT=GDAL
INPUT=SHAPEFILE DEBUG=MSDEBUG
Any help would be spectacular. Thanks advance.
- Chris
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