[Geotiff] Polar stereographic projection
cm at vcs.de
Tue Feb 19 07:20:36 PST 2008
I once more would like to ask a question regarding the definition of the
polar stereographic projection in the GeoTIFF format.
I would like to store raster images in the GeoTIFF format using the
polar stereographic projection (north or south) were the center longitude
can be arbitrary between 180 degrees west to 180 degrees east.
Furthermore the latitude in which the map plane intersects the globe
should also be anywhere between 90 degrees south and 90 degrees
north. (A typical example would be a center longitude of 15 degrees east
and a intersection latitude of 60 degrees north.)
How is this defined in the GeoTIFF tags?
Looking at the samples files on the remotesensing.org website for
example for a polar stereographic south image the definition here is:
ProjNatOriginLongGeoKey (Double,1): 0
ProjNatOriginLatGeoKey (Double,1): -90
ProjFalseEastingGeoKey (Double,1): 0
ProjFalseNorthingGeoKey (Double,1): 0
ProjCenterLatGeoKey (Double,1): -90
ProjScaleAtNatOriginGeoKey (Double,1): 1
Which of the two “-90” values defines the map plane and which only
means “this is polar stereograhpic south”?
I have not been able to find a valid set of parameters to define my raster
All other projections I have tried look fine.
I would be glad if anyone could help me on this issue, since I have no idea,
what is the correct way of defining the meta data for this projection.
Thanks in advance!
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