Thank you, Daniele, I will stick to full 32 bits then.
In principle, I would be happy to help out with coding, but for now
consider myself too much a beginner in geoserver/java etc. to dive into
it. Maybe later ;-)
But I will open a JIRA ticket.
Thanks again,
Jeroen
On 13-Mar-20 16:53, Daniele Romagnoli wrote:
Hi Jeroen,
I'm not 100% sure that the underlying pure java imageio-ext TIFF
reader (the core lib providing TIFFs I/O in GeoServer) is supporting
half precision float number (so what GDAL reports as a Float32
datatype with only 16 bits being used).
...
Ok. After having investigated a bit on the topic I think that the 16
bits Float has been defined to support the HALF data type used by
OpenEXR file format, as TIFF Technical Note 3 so it's not part of the
official TIFF 6.0 specification.
Taking a deeper look at the current TIFF Reader java code I see that
the parts parsing the SampleFormat TAG (ID 339) and BitsPerSample (ID
258) are not supporting this specific new use case.
So I would say that the current version of GeoServer is not supporting
this file format.
You may want to open a JIRA in GeoServer (and a ticket in imageio-ext
<https://github.com/geosolutions-it/imageio-ext> project, too) to
report that.
Code contributions or funding to get it implemented would be more than
welcomed, though.
Hope this helps.
Regards,
Daniele
On Tue, Mar 10, 2020 at 3:11 PM Jeroen van Gent
<[email protected] <mailto:[email protected]>> wrote:
Dear group,
I have generate some 'half-precision' floating point GeoTiffs that
I want to server in GeoServer (v2.15.2). I also apply an SLD color
style.
However, when requesting the GeoTiff layer wthrough WMS I get
wrong colors (tiles take the color of the maximum value in the
color range). If a create the files as 32 bit, all goes fine.
Can GeoServer handle 16 bit float GeoTiffs?
Here is a gdalinfo example:
|Driver:GTiff/GeoTIFFFiles:5p_tropomi_so2vcd_epsg3857_20200304_res0.01.tiffSizeis36084,36124CoordinateSystemis:PROJCS["WGS
84 / Pseudo-Mercator",GEOGCS["WGS
84",DATUM["WGS_1984",SPHEROID["WGS
84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["X",EAST],AXIS["Y",NORTH],EXTENSION["PROJ4","+proj=merc
+a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0
+k=1.0 +units=m +nadgrids=@null +wktext
+no_defs"],AUTHORITY["EPSG","3857"]]Origin=(-20026376.390000000596046,20048966.100000001490116)PixelSize=(1110.000000000000000,-1110.000000000000000)Metadata:AREA_OR_POINT=AreaImageStructureMetadata:COMPRESSION=DEFLATE
INTERLEAVE=BAND
CornerCoordinates:UpperLeft(-20026376.390,20048966.100)(179d54'
0.00"W, 85d 3'36.00"N) Lower Left (-20026376.390,-20048673.900)
(179d54' 0.00"W,85d3'35.19"S) Upper Right
(20026863.610,20048966.100) (179d54'15.76"E, 85d
3'36.00"N)LowerRight(20026863.610,-20048673.900)(179d54'15.76"E,
85d 3'35.19"S) Center ( 243.610, 146.100) ( 0d 0' 7.88"E,0d0'
4.72"N) Band 1 Block=256x256 Type=Float32, ColorInterp=Gray NoData
Value=-999 Overviews: 18042x18062, 9021x9031, 4511x4516,
2256x2258, 1128x1129, 564x565, 282x283 Image Structure Metadata:
NBITS=16|
Thank you.
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Regards,
Daniele Romagnoli
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Please make sure you read the following two resources before posting to this
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If you want to request a feature or an improvement, also see this:
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