Hi, I am reprojecting a layer of Minnesota county boundaries from epsg:26915 to be commensurate with a google maps overlay (epsg:3857 aka epsg:900913). The county overlay is shifted down from the Google Maps map by I'm guessing to be about 10 miles. Relevant links to map with Openlayers, straight mapserver map of counties, and the contents of the mapfile for the counties are below.
My question is: Do I have a data problem, or is it a mapserver reprojection problem? Or is it a proj4 reprojection problem? In addition, I am including the epsg codes and the proj.4 equivalents I got from spatialreference.org and stuck into my proj/epsg file: # got proj/epsg entries from proj4 link at: http://spatialreference.org/ref/sr-org/6864/ : <3785> +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <> <3857> +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <> <900913> +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <> Help is much appreciated, Thanks, Matt -------------------------------------------------------------------------------------------------------------------------- Map Overlays: http://209.20.85.148/scratch/google-state.htm Straight mapserver output of county overlay: http://209.20.85.148/cgi-bin/mapserv?mode=map&map=/var/www/scratch/county-epsg900913.map County Map (epsg:26916) mapfile (county-epsg900913.map): ========================= MAP ################ # Map attributes ################ IMAGETYPE PNG # epsg:3785 http://spatialreference.org/ref/epsg/3785/proj4/ # Convert EXTENT -10779406.34 5378456.81 -9951631.67 6334157.39 PROJECTION "init=epsg:3857" END SIZE 700 700 IMAGECOLOR 244 244 244 FONTSET "/home/matt/votevis/mapserver-files/fonts/fonts.list" ################ # Layers ################ #--------------------------------------------------------------- # Counties # Renders different thickness borders at different scales #--------------------------------------------------------------- LAYER NAME "county" DATA "/home/matt/votevis/MN/2010-election/shp/shp_counties" STATUS default TYPE polygon PROJECTION "init=epsg:26915" END CLASS NAME "county_lg" STYLE OUTLINECOLOR 111 111 111 COLOR -1 -1 -1 WIDTH 3 END END END # Layer county END # MAP -- Do not seek to follow in the footsteps of the wise men of old. Seek what they sought. - Matsuo Munefusa (”Basho”)
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