I got myself in a tangle today working with LandSat 5 data - I know this
should be the easiest thing in the world right?
RasterSymbolizer lets you select a number of channels (4,5,1 generally
match with RGB for a "true color" image). But here is where I run into
trouble - the data is in the range 0.0 to 1.1 (with -Infinite as NO_DATA).
I had hoped that setting this up in the geoserver layer definition, and
then using SLD to select out the bands would magically work.
Ran into a couple problems:
* In the resulting visual NO_DATA is not respected as transparent .. tried
also in a layer group
* I was not sure I need to transform the data from each band (remember 0.0
- 1.0 float) to 0 to 256. We cannot do a colormap entry on each band ... so
I am a bit stuck.
Exploring the problem with a single band (and color map) we can map no data
to a transparent color just fine - but this does not get me a full color
image :(
Having a look at geometry transformations to see if we can stage a decent
RGB channel before letting SLD have a crack at it:
* BandMerge lets me combine several bands into a resolution image
* Reclassify could be used to remap the 0.0f to 1.0f range to 0 to 256
integers expected by SLD
Putting these two ideas together (as a geometry transformation) may work -
but I wanted to check before proceeding.
------------------------------------------------------------------------------
Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
_______________________________________________
Geoserver-users mailing list
Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users
