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This works: http://mrdata.usgs.gov/services/sc?REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=256&HEIGHT=256&FORMAT=image/png&BBOX=-83.4,32,-78.4,35.3&LAYERS=South_Carolina_Lithology&SRS=EPSG:4326&STYLES=

This does not (blank image): http://mrdata.usgs.gov/services/sc?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&WIDTH=256&HEIGHT=256&FORMAT=image/png&BBOX=-83.4,32,-78.4,35.3&LAYERS=South_Carolina_Lithology&CRS=EPSG:4326&STYLES=

Notice the 1.1.1 -> 1.3.0 and SRS->CRS are the only changes. Is this a problem with the service or is my second URL incorrect?

I've observed the same issue with other Map Server services:

Works: http://mesonet.agron.iastate.edu/cgi-bin/mapserv/mapserv?map=/mesonet/www/apps/iemwebsite/data/wms/goes/conus_ir.map&SERVICE=WMS&REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=256&HEIGHT=256&FORMAT=image/png&TRANSPARENT=TRUE&BBOX=-126,24,-66,50&LAYERS=conus_ir_4km_900913,conus_ir_4km&SRS=EPSG:4326&STYLES=

Does not work (blank image): http://mesonet.agron.iastate.edu/cgi-bin/mapserv/mapserv?map=/mesonet/www/apps/iemwebsite/data/wms/goes/conus_ir.map&SERVICE=WMS&REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&WIDTH=256&HEIGHT=256&FORMAT=image/png&TRANSPARENT=TRUE&BBOX=-126,24,-66,50&LAYERS=conus_ir_4km_900913,conus_ir_4km&CRS=EPSG:4326&STYLES=

So I'm assuming it's an issue with my 1.3.0 URLs.

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It is interesting to note that it is necessary to redefine the BBOX order as well: 1.1.1 mrdata.usgs.gov/services/… 1.3.0 mrdata.usgs.gov/services/… –  ca0v Apr 12 '12 at 20:41

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