On 21 November 2013 21:23, Rahkonen Jukka <jukka.rahko...@mmmtike.fi> wrote:
> I would try if it makes difference to save result from gdal_merge first
> into uncompressed tiff and compress it with deflate in a separate run.
>
>
Yep, that worked. Although that's unfeasible for the full dataset; I don't
have enough diskspace for an uncompressed version.
Also, doing that (deflate, level 9), the tiled version was about 15%
smaller than the untiled version.
Thanks!
Jonathan
> Jukka Rahkonen
>
> ------------------------------
>
> Jonathan Moules <jonathanmou...@warwickshire.gov.uk> wrote:
>
>
>
> 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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