Projection Help GPS vs National Atlas

[Schuyler Erle]

* On 29-Mar-2005 at 12:32PM PST, James Goddard said:
>
> #National Atlas layer projection
> "proj=latlong" "ellps=GRS80" "datum=NAD83"
>
> What projection should I use for the GPS coordinates so that they display
> correctly?

"proj=latlong" "ellps=WGS84" "datum=WGS84" should work just fine for
GPS. This is essentially equivalent (to eight decimal places) to
GRS80.

Be aware, however, that the nationalatlas.gov shapefiles have been
generalized (i.e. simplified), and are unlikely to match up exactly
with your GPS traces in any case.

SDE