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Understanding Geographic Coordinate Systems and Cell Size

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06-20-2011 07:49 AM
BradNace
Deactivated User
Hey,

Can anyone tell me a way to figure out what the unit of measure the cell value (ModelPixelScaleTag) represents? The enclosed metadata is for approximately 1/32 of the planet.

Metadata:
Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      ModelTiepointTag (2,3):
         0                0                0                
         -90              45               0                
      ModelPixelScaleTag (1,3):
         0.002083333333333330.002083333333333330                
      End_Of_Tags.
   Keyed_Information:
      GTModelTypeGeoKey (Short,1): ModelTypeGeographic
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GeographicTypeGeoKey (Short,1): GCS_WGS_84
      GeogCitationGeoKey (Ascii,7): "WGS 84"
      GeogAngularUnitsGeoKey (Short,1): Angular_Degree
      End_Of_Keys.
   End_Of_Geotiff.

GCS: 4326/WGS 84
Datum: 6326/World Geodetic System 1984
Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)

PROJ.4 Definition: +proj=latlong +ellps=WGS84 +to_meter=1.0000000000

Corner Coordinates:
Upper Left    (-90.0000000,45.0000000)
Lower Left    (-90.0000000,0.0000000)
Upper Right   (-45.0000000,45.0000000)
Lower Right   (-45.0000000,0.0000000)
Center        (-67.5000000,22.5000000)



Thanks,

Avotas
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2 Replies
MelitaKennedy
Esri Notable Contributor
Hi Avotas,

It's in the same units as the coordinate system: decimal degrees.

Melita
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BradNace
Deactivated User
Thanks!

-Avotas
0 Kudos