>
>
> It is not completely surprising. If there are no repeateable patterns in
> the
> uncompressed stream, deflate can result in (a bit) larger files. You might
> want
> to try with -co INTERLEAVE=BAND added to see if it improves things. But
> generally DEFLATE is not appropriate for aerial imagery.
>
The "bit" larger files are typically about double the size of the
uncompressed one!
I know deflate isn't as well suited, but I'm experimenting with a whole
bunch of different settings to see what sticks.
======
I'm now trying to get the four band into GeoServer (regular GeoTIFF), but
it's not having it. I've created it the same way as the 3 band:
> gdal_merge -q -o rgbi.tif -of GTiff -co TILED=YES -co BIGTIFF=YES -co
> COMPRESS=JPEG -co JPEG_QUALITY=25 -co BLOCKXSIZE=512 -co BLOCKYSIZE=512
> --optfile tiff_list.txt
(low compression for testing). No pyramids yet.
The first thing I notice is that the 4 band is *smaller* (118MB) than the 3
band (164MB).
The gdalinfo for the four band:
Driver: GTiff/GeoTIFF
Files: rgbi.tif
Size is 8000, 24000
Coordinate System is:
PROJCS["OSGB 1936 / British National Grid",
[brevity removed]
Origin = (419000.000000000000000,240000.000000000000000)
Pixel Size = (0.125000000000000,-0.125000000000000)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
COMPRESSION=JPEG
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 419000.000, 240000.000) ( 1d43'22.27"W, 52d 3'27.49"N)
Lower Left ( 419000.000, 237000.000) ( 1d43'22.87"W, 52d 1'50.38"N)
Upper Right ( 420000.000, 240000.000) ( 1d42'29.76"W, 52d 3'27.37"N)
Lower Right ( 420000.000, 237000.000) ( 1d42'30.39"W, 52d 1'50.26"N)
Center ( 419500.000, 238500.000) ( 1d42'56.32"W, 52d 2'38.88"N)
Band 1 Block=512x512 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=512x512 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=512x512 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=512x512 Type=Byte, ColorInterp=Alpha
----
The GeoServer logs contain an error (WMS GetMap request):
2013-11-20 17:56:07,498 ERROR [org.geoserver.ows] -
java.lang.RuntimeException: javax.imageio.IIOException: Unsupported Image
Type
at
com.sun.media.jai.imageioimpl.ImageReadOpImage.computeTile(ImageReadOpImage.java:706)
at
com.sun.media.jai.util.SunTileScheduler.scheduleTile(SunTileScheduler.java:904)
at javax.media.jai.OpImage.getTile(OpImage.java:1129)
....
Caused by: javax.imageio.IIOException: Unsupported Image Type
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(Unknown Source)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(Unknown Source)
at
it.geosolutions.imageioimpl.plugins.tiff.TIFFJPEGDecompressor.decodeRaw(TIFFJPEGDecompressor.java:278)
Ideally I'm looking to have one source file which can be symbolised as not
just RGB, but also as any number of false-colour possibilities.
Any suggestions anyone? I'm stumbling into new (for me) territory here.
Thanks,
Jonathan
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