Projection Help GPS vs National Atlas
james at GODDARD.BZ
Tue Mar 29 15:20:06 EST 2005
I'm a little confused by all of the projection stuff. Any help would be
I'm using the National Atlas maps from
I am able to get the layers I want displayed great. Now what I want to do
is add a layer of GPS points. I am creating a shapefile for these points
with shapetools entering decimal lat/lon positions.
When I display this layer it the points display but are way off of the US
I've been playing around with the projections and have yet to figure out
what I need to get this to display correctly. Here is what I have:
#main mapfile projection
"proj=lcc" "lat_1=32" "lat_2=44" "lat_0=38" "lon_0=-
100" "x_0=0" "y_0=0" "ellps=GRS80" "datum=NAD83"
#National Atlas layer projection
"proj=latlong" "ellps=GRS80" "datum=NAD83"
What projection should I use for the GPS coordinates so that they display
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