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Re: [udig-devel] Problem with recognizing geotiff tags - I think 
I was hoping to get a better error message or warning :-)
My understanding is that the image is showing up with data in the range of 752107, 2590533 (from the screen snap); but poor uDig still thinks the map is in WGS 84 (so the output is invalid). Indeed it looks resampling is not happening; the image is just being dumped onto the screen (which is fine when the map is changed to the right projection...). 

Jody

Hey,

Jody's running ahead with solutions but I don't yet understand what your
issue is. You say the coordinates are NE which presumably means northing
and easting which sounds perfect for a UTM. Long/Lat would be wrong.
UDig is showing your CRS is WGS84 which is what your output also claims

What are you getting and what are you expecting?

--adrian



On Thu, 2007-11-22 at 10:31 -0800, Hugh Jennings wrote:

Hi,
Just want to know if this is a known problem or an incompatibility with some other software we use.
I can display geotiff's we have created but the geotiff tags don't seem to be read completely. 

The image is in WGS UTM Zone 39.  Below is the result from listgeo

    listgeo uae_50m_dem_csh.tif
    Geotiff_Information:
       Version: 1
       Key_Revision: 1.0
       Tagged_Information:
          ModelTiepointTag (2,3):
0 0 0 623250 2702250 0 ModelPixelScaleTag (1,3): 50 50 0 End_Of_Tags. 
       Keyed_Information:
          GTModelTypeGeoKey (Short,1): ModelTypeProjected
          GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
          GTCitationGeoKey (Ascii,257): "IMAGINE GeoTIFF Support
    Copyright 1991 - 2005 by Leica Geosystems Geospatial Imaging, LLC.
    All Rights Reserved
    @(#)$RCSfile: egtf.c $ IMAGINE 9.0 $Revision: 10.0 $ $Date:
    2005/07/26 15:10:00 EST $
    Projection Name = UTM
    Units = meters
    GeoTIFF Units = meters"
          GeogGeodeticDatumGeoKey (Short,1): Datum_WGS84
          GeogEllipsoidGeoKey (Short,1): Ellipse_WGS_84
          ProjectedCSTypeGeoKey (Short,1): PCS_WGS84_UTM_zone_39N
          PCSCitationGeoKey (Ascii,27): "Processed by Photosat LTD."
          ProjCoordTransGeoKey (Short,1): CT_TransverseMercator
          ProjLinearUnitsGeoKey (Short,1): Linear_Meter
ProjNatOriginLongGeoKey (Double,1): 51 ProjNatOriginLatGeoKey (Double,1): 0 ProjFalseEastingGeoKey (Double,1): 500000 ProjFalseNorthingGeoKey (Double,1): 0 ProjScaleAtNatOriginGeoKey (Double,1): 0.9996 End_Of_Keys. 
       End_Of_Geotiff.

    PCS = 32639 (name unknown)
    Projection = 16039 ()
    Projection Method: CT_TransverseMercator
       ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
       ProjNatOriginLongGeoKey: 51.000000 ( 51d 0' 0.00"E)
       ProjScaleAtNatOriginGeoKey: 0.999600
       ProjFalseEastingGeoKey: 500000.000000
       ProjFalseNorthingGeoKey: 0.000000
    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)
    Projection Linear Units: 9001/metre (1.000000m)

    Corner Coordinates:
    Upper Left    ( 623250.000,2702250.000)
    Lower Left    ( 623250.000,2511800.000)
    Upper Right   ( 847450.000,2702250.000)
    Lower Right   ( 847450.000,2511800.000)
    Center        ( 735350.000,2607025.000)
When I load this image into a uDig map the CRS indicated is WGS84 with no projection. 
The coordinates reported in the map window are EN and not Lat Long.

Is uDig attempting to reproject the image on the fly?

Do our geotiff's need some further tag to be recognized properly?

Any help would be appreciated,

Thanks,

Hugh


_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel


_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel

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