Hopefully someone with some Mapserver knowledge can help me out as I am
having problems getting Mapserver to work with OL.
First a little background. I have OL 2.8 rc6 up and running with multiple
layers being pulled via my WMS server (Manifold). I have been having
problems getting Manifold to generate the tiles for ECW files so I am
turning to MapServer to hopefully solve the problem. I am not a GIS person,
I am a web programmer, so please go easy.
Here is the output of gdalinfo on my ECW File:
Driver: ECW/ERMapper Compressed Wavelets
Files: ortho.ecw
Size is 75010, 115010
Coordinate System is:
PROJCS["NUTM17",
GEOGCS["NAD83",
DATUM["North_American_Datum_1983",
SPHEROID["GRS 1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6269"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9108"]],
AXIS["Lat",NORTH],
AXIS["Long",EAST],
AUTHORITY["EPSG","4269"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",-81],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["Meter",1]]
Origin = (646999.000000000000000,4780000.999999986000000)
Pixel Size = (0.200000000000000,-0.200000000000000)
Corner Coordinates:
Upper Left ( 646999.000, 4780001.000) ( 79d11'30.77"W, 43d 9'30.53"N)
Lower Left ( 646999.000, 4756999.000) ( 79d11'52.64"W, 42d57'5.23"N)
Upper Right ( 662001.000, 4780001.000) ( 79d 0'26.85"W, 43d 9'19.50"N)
Lower Right ( 662001.000, 4756999.000) ( 79d 0'50.94"W, 42d56'54.27"N)
Center ( 654500.000, 4768500.000) ( 79d 6'10.32"W, 43d 3'12.52"N)
Band 1 Block=75010x1 Type=Byte, ColorInterp=Red
Overviews: arbitrary
Band 2 Block=75010x1 Type=Byte, ColorInterp=Green
Overviews: arbitrary
Band 3 Block=75010x1 Type=Byte, ColorInterp=Blue
Overviews: arbitrary
Viewing some documentation and using google, I created this map file:
MAP
PROJECTION "init=epsg:4326"
END
SIZE 256 256
STATUS ON
EXTENT 646999.000 4756999.000 662001.000 4780001.000
UNITS METERS
LAYER
NAME "orthoEnhanced"
TYPE RASTER
STATUS ON
PROJECTION "init=epsg:4326"
END
DATA "O:\ortho.ecw"
CLASS
STYLE
COLOR 110 50 100
OUTLINECOLOR 200 200 200
SYMBOL 0
END
END
END
END
And then created the layer for OpenLayers:
var msecw = new OpenLayers.Layer.MapServer("OpenLayers WMS",
"http://127.0.0.1:81/cgi-bin/mapserv.exe?map=ecw.map";, {
layers: 'orthoEnhanced' });
map.addLayer(msecw);
All of my tiles are coming blank. Here is what Firebug says for the
MapServer requests:
http://127.0.0.1:81/cgi-bin/mapserv.exe?map=ecw.map&layers=orthoEnhanced&mode=map&map_imagetype=png&mapext=-79.162519+42.920835+-79.100019+42.983335&imgext=-79.162519+42.920835+-79.100019+42.983335&map_size=256+256&imgx=128&imgy=128&imgxy=256+256
One thing I can see is that my extents in the request are Lat Long and the
Extents in the Map file are UTM 17. Should the map file be changed to Lat
Long? (And how do I convert the values)
If I were to hack around on the Mapserv.exe url, and remove everything in
the querystring except the following:
http://127.0.0.1:81/cgi-bin/mapserv.exe?map=ecw.map&mode=map&map_imagetype=png&layers=orthoEnhanced
then I get a picture of the full ortho. In my mind, that means that
MapServer can read the ecw file and generate a 256X256 PNG.
Once I append the coordinates that url, then I just get blank tiles.
Any help would be greatly appreciated!!!
Thanks,
Shawn
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