I am unsure how to get a shapefile (Lat/lon, NAD83) to match, when
rendered, the boundary outline that I see on Google maps.
To render the shapefile (to a png) I am using shp2img which installed
with ms4w (1.5.2, which includes mapserver 4.8.3), and the png that was
created can be seen here:
http://tinyurl.com/gaucm
Notice that it is "scrunched down" compared to the png that I traced off
of Google maps, as shown in this image:
http://tinyurl.com/z89l2
I am assuming the reason this happens is that I am doing projection
incorrectly -- Google Maps is Lat/lon Mercator. But I do not know what
I should do next ... i.e., does the the shapefile need to be converted
to a different projection first?
The shapefile is the Census' :State and State Equivalent Areas"
Cartographic Boundary File for MN (st27_d00).
http://www.census.gov/geo/www/cob/st_metadata.html#meta
My .map is:
*************************
MAP
NAME MN
STATUS ON
SIZE 176 197
EXTENT -97.238541 43.499504 -89.561234 49.384365
IMAGECOLOR 255 255 255
IMAGETYPE PNG
UNITS METERS
PROJECTION
"proj=latlong" "ellps=GRS80" "datum=NAD83"
END
LAYER
NAME BOUNDARY
TYPE POLYGON
STATUS ON
DATA st27_d00.shp
CLASS
STYLE
COLOR 150 150 200
OUTLINECOLOR 0 0 255
END
END
END
END
