Dear Deborah,
the situation is a follows:
- Via WMS, unless you write your own outputformat geotiff you will
always get 8 bits as the raster goes through the rendering process
which does this transformation anyway
- Via WCS you might get the geotiff in 16 bits providing the input is
in 16 bits.
Alternative if you want to get WMS to return 16 bits geotiff is to do
(as in develop yourself) something similar to this DDS extension
http://docs.geoserver.org/latest/en/user/community/dds/index.html.
Regards,
Simone Giannecchini
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On Fri, Jun 29, 2012 at 6:22 PM, Pierce, Deborah Jean Violette
d...@mitre.org wrote:
Hi All,
We have some DTED elevation data (.dt files). We need to get the data into
GeoServer, and have GeoServer deliver this to our software as a INT16
GeoTiff. I've tried to do this various ways (importing the data as .dt data
as is into GeoServer, also tried converting .dt data into GeoTIFF file and
importing that into GeoServer). Unfortunately, every map GeoServer WMS sends
out is 8bit GeoTIFF, but we need elevation data as INT16. Specifically, the
GeoTIFF tag values I'd like to have in the map delivered by GeoServer are:
Tag PHOTOMETRIC_INTERPRETATION
GeoServer delivers a GeoTIFF tag value of 2
(RGB) - I'd prefer a value of 1 (BlackIsZero)
Tag RESOLUTION_UNIT
GeoServer delivers a GeoTIFF tag value of 1 (no
absolute unit of measurement) - I'd prefer a value of 2 (unit of measurement
inch)
Tag BITS_PER_SAMPLE
GeoServer delivers a GeoTIFF tag value of 8 (count=4) - I
need a value of 16 (count=1) to represent INT16
Tag SAMPLES_PER_PIXEL
GeoServer delivers a GeoTIFF tag value of 4 - I'd prefer a
value of 1
Tag SAMPLE_FORMAT
GeoServer doesn't include this tag - I'd prefer it to be
included and have a value of 2 (two's complement signed integer data)
FYI, the GetMapRequest I'm sending to GeoServer is:
DEBUG2
wms_get_map_request_url=http://localhost:8090/geoserver/ows?SERVICE=WMSLAYERS=mxr%3Adted2_w117_n35FORMAT=image%2FgeotiffHEIGHT=1300TRANSPARENT=TRUEBGCOLOR=0xFFREQUEST=GetMapWIDTH=1590BBOX=117.518473,35.337083,-117.076805,35.698195STYLES=VERSION=1.3.0
I setup this request using GeoTools version 8. Can anybody provide
information on how to get this to work? Any help would be very much
appreciated!
I'm using the following setup:
GeoServer 2.2 -beta1
- Build Information
Version2.2-beta1
Subversion Revision16907
Build Date05-Apr-2012 20:21
GeoTools Version8-SNAPSHOT (rev 38659)
Windows 7 (64bit)
Java 1.6
I'm using native JAI and JAI ImageIO 1.1 packages for processing the GeoTiff
delivered from GeoServer
The web container is the default (Jetty 6?)
Regards,
Debbie Pierce
MITRE Corporation
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