Blank Geotiff

[Norman Barker]

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]On
Behalf Of Dominic Lowe
Sent: Thursday, May 19, 2005 3:31 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] Blank Geotiff


I've just set up a mapserver WCS  that doesn't seem to want to serve
GeoTiffs...

The WCS is working fine for png/jpeg but whenever I request a Geotiff I
just get back a blank (grey..) screen. 0kb are returned. However I am
sure the GDAL GTiff driver is being recognised as there is no error
message.

i.e.
If I request a "png" I get an image.
If I request a "geotiff" I get a null grey screen.
If I request a "banana" I get an error message.

I've configured GDAL with --with-libtiff=internal and
--with-geotiff=internal. Mapserver is configured --without-tiff (so it
will use the GDAL drivers).

However I have also tried to compile GDAL with external libtiff and
libgeotiff libraries but it doesn't seem to make any difference to the
result..

Output format is declared as:
OUTPUTFORMAT
    NAME Geotiff
    DRIVER "GDAL/GTiff"
    MIMETYPE "image/tiff"
    IMAGEMODE BYTE
    EXTENSION "tif"
END

Any thoughts?

Regards
Dominic

Hi Dominic,

I think you definition should be
    OUTPUTFORMAT
        NAME Geotiff
        DRIVER "GDAL/GTiff"
        MIMETYPE "image/tiff"
        IMAGEMODE FLOAT32
        EXTENSION "tif"
    END

since your data is floating point if I remember correctly.

Norman Barker

Drop me an email, or phone if you have any problems.