Thanks Andrea,
I followed your suggestions and found that Geoserver 2.2 displays
rasters with negative values successfully. So I will upgrade.
However, there were issues displaying a raster that had both negative
and positive values. Using the standard 'raster' style the raster was
displayed but the values had been stretched from -9/18 to 0/255. The
actual data values were lost. I tried a three color gradient over
negative values, zero and positive values however this resulted in a
failure to display the raster.
I will open a bug report for this issue.
Thanks again,
Abe.
<http://www.pacioos.org>
On 9/25/2012 10:25 PM, Andrea Aime wrote:
On Wed, Sep 26, 2012 at 5:16 AM, Richard (Abe) Coughlin
<ra...@hawaii.edu <mailto:ra...@hawaii.edu>> wrote:
Do raster cells in Geoserver have to contain positive values?
When I try to publish a GeoTiff store for a bathymetry grid with
negative depth values Geoserver tells me 'Could not list layers
for this store, an error occurred retrieving them: Unable to
acquire a reader for this coverage with format: GeoTIFF'.
When I change all the values to positive values a store can be
generated and publishable.
Seems like Geoserver can't handle negative raster cell values? At
least with GeoTiffs.
I'm using Geoserver 2.0.2.
I'm not aware of any such limitation, but the GeoServer version you
are using is old.
Can you try out 2.2.0 and if the problem persist, open a bug report on
jira.codehaus.org <http://jira.codehaus.org>
attaching a sample tiff that you cannot open?
Cheers
Andrea
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