EQR projection with a constant earth radius

jwoytusjwoytus Global Mapper UserPosts: 1
edited July 2008 in Raster Data
While I am very comfortable using the batch reproject, I have a need to define the earth radius used for my EQR projection. I find that when I use choose to "Create New Datum" and choose a "Sphere Radius 6370997 m", the resultant geotiff is missing crucial information. Global Mapper does not know anything about the projection of the output file. It should at least indicate that it is spherical and the radius (axis), right?

Here's the output of listgeo:
Geotiff_Information:
Version: 1
Key_Revision: 1.0
Tagged_Information:
ModelTiepointTag (2,3):
0 0 0
-2891066.73 5204809.73 0
ModelPixelScaleTag (1,3):
149.456397 149.456397 1
End_Of_Tags.
Keyed_Information:
GTModelTypeGeoKey (Short,1): ModelTypeProjected
GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
GeogAngularUnitsGeoKey (Short,1): Angular_Degree
ProjectedCSTypeGeoKey (Short,1): User-Defined
ProjLinearUnitsGeoKey (Short,1): Linear_Meter
End_Of_Keys.
End_Of_Geotiff.

Projection Linear Units: 9001/metre (1.000000m)

Corner Coordinates:
Upper Left (-2891066.731, 5204809.735)
Lower Left (-2891066.731, 2652841.749)
Upper Right ( 2779906.812, 5204809.735)
Lower Right ( 2779906.812, 2652841.749)
Center ( -55579.960, 3928825.742)

Comments

  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited July 2008
    If Global Mapper does not know the EPSG code to use for the datum used for the export (which it would not for a custom datum), no projection or datum information will be written to the file as the necessary values are not known. Global Mapper never writes out spheroid parameters to a GeoTIFF file.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
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