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Does anybody know what the coordinate system is for shapefiles from the NationalAtlas.gov/rawdata? I can open the files in ArcMAP 9.3, but the coordinates are undefined.
Thanks,
kru
National Atlas Coordinate System
Started by
razornole
, Jan 14 2010 10:28 PM
5 replies to this topic
#1
Posted 14 January 2010 - 10:28 PM
razornole
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#2
Posted 15 January 2010 - 04:03 AM
Nick H
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Does anybody know what the coordinate system is for shapefiles from the NationalAtlas.gov/rawdata? I can open the files in ArcMAP 9.3, but the coordinates are undefined.
The shapefiles are geographic, WGS84 lat/lon.
Regards, N.
Caversham, Reading, England.
#3
Posted 15 January 2010 - 09:00 AM
razornole
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Thanks a lot Nick, I gave up searching after an hour or so.
kru
kru
"Ah, to see the world with the eyes of the gods is geography--to know cities and tribes, mountains and rivers, earth and sea, this is our gift."
Strabo 22AD
Strabo 22AD
#4
Posted 18 January 2010 - 12:49 PM
François Goulet
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I just downloaded some shapefiles for a project and there's a text file in the .zip...
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000278
Longitude_Resolution: 0.000278
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222
I'd say NAD83 lat/long instead...
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000278
Longitude_Resolution: 0.000278
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257222
I'd say NAD83 lat/long instead...
Francois Goulet
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#5
Posted 18 January 2010 - 01:42 PM
Nick H
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I'd say NAD83 lat/long instead...
My mistake, I'd sort of got used to the 'NAD83/WGS84' idea, but what's a metre between friends?
. Actually, it can be a lot sometimes, so my apologies to Razornole.Regards, N.
Caversham, Reading, England.
#6
Posted 18 January 2010 - 11:41 PM
razornole
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I'd say NAD83 lat/long instead...
My mistake, I'd sort of got used to the 'NAD83/WGS84' idea, but what's a metre between friends?
Regards, N.
No apologies needed, thanks for the help, both of you. I didn't get that text file with my layer. This was for a 2.5'x4' map that covers an area ~400 miles. That meter doesn't make a bit of difference. The map works well regardless.
Thanks,
kru
"Ah, to see the world with the eyes of the gods is geography--to know cities and tribes, mountains and rivers, earth and sea, this is our gift."
Strabo 22AD
Strabo 22AD
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