[Gdal-dev] GTOPO30 and max value

[Markus Neteler]

On Wed, May 30, 2007 at 08:41:34PM -0400, Frank Warmerdam wrote:
>  Markus Neteler wrote:
> > Frank, it looks like this:
> > cat W100N40.HDR
> > BYTEORDER      M
> > LAYOUT       BIL
> > NROWS         6000
> > NCOLS         4800
> > NBANDS        1
> > NBITS         16
> > BANDROWBYTES         9600
> > TOTALROWBYTES        9600
> > BANDGAPBYTES         0
> > NODATA        -9999
> > ULXMAP        -99.99583333333334
> > ULYMAP        39.99583333333333
> > XDIM          0.00833333333333
> > YDIM          0.00833333333333
> 
>  Markus,
> 
>  You can add the "PIXELTYPE SIGNEDINT" line in the .hdr to force
>  interpretation of the file as signed rather than unsigned integers.

Excellent! Now it works

gdalinfo -mm W100N40.DEM
Driver: EHdr/ESRI .hdr Labelled
...
Band 1 Block=4800x1 Type=Int16, ColorInterp=Undefined
  Min=-9999.000 Max=6710.000   Computed Min/Max=1.000,6710.000
  Minimum=-9999.000, Maximum=6710.000, Mean=-6078.800, StdDev=5044.200
  NoData Value=-9999

Thanks,
Markus

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ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler
ITC -> since 1 March 2007 Fondazione Bruno Kessler
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