Thanks for all your help again,
I now have
Driver: GTiff/GeoTIFF
Files: sh98.tif
Size is 4000, 4000
Coordinate System is:
PROJCS["OSGB 1936 / British National Grid",
GEOGCS["OSGB 1936",
DATUM["OSGB_1936",
SPHEROID["Airy 1830",6377563.396,299.3249646000043,
AUTHORITY["EPSG","7001"]],
AUTHORITY["EPSG","6277"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4277"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",49],
PARAMETER["central_meridian",-2],
PARAMETER["scale_factor",0.9996012717],
PARAMETER["false_easting",400000],
PARAMETER["false_northing",-100000],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AUTHORITY["EPSG","27700"]]
Origin = (290000.000000000000000,390000.000000000000000)
Pixel Size = (2.500000000000000,-2.500000000000000)
Metadata:
TIFFTAG_IMAGEDESCRIPTION=1:25000 TILE SH98
TIFFTAG_DATETIME=2006:09:12 16:00:12
TIFFTAG_COPYRIGHT=ORDNANCE SURVEY CROWN COPYRIGHT 2005
TIFFTAG_XRESOLUTION=254
TIFFTAG_YRESOLUTION=254
TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
AREA_OR_POINT=Area
Image Structure Metadata:
COMPRESSION=DEFLATE
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 290000.000, 390000.000) ( 3d39'16.05"W, 53d23'42.34"N)
Lower Left ( 290000.000, 380000.000) ( 3d39'3.53"W, 53d18'18.85"N)
Upper Right ( 300000.000, 390000.000) ( 3d30'14.80"W, 53d23'49.50"N)
Lower Right ( 300000.000, 380000.000) ( 3d30'3.42"W, 53d18'25.98"N)
Center ( 295000.000, 385000.000) ( 3d34'39.45"W, 53d21'4.25"N)
Band 1 Block=512x512 Type=Byte, ColorInterp=Palette
Overviews: 4000x4000, 2000x2000, 1000x1000, 500x500, 250x250, 125x125, 63x63,
32x32
Color Table (RGB with 256 entries)
0: 89,72,73,255
...
The while process I followed was
1) Took the raw TIF images
2) Added a .PRJ file for each image
3) Added the World file for each
4) Ran gdal_translate for each file
for file in `ls *tif`
do
gdal_translate -of GTiff -co "TILED=YES" -co "COMPRESS=DEFLATE" -co
"BLOCKXSIZE=512" -co "BLOCKYSIZE=512" -a_srs "EPSG:27700" $file out/$file
done
5) Ran a gdaladdo for each file in 'out'
for file in `ls *tif`
do
gdaladdo -r nearest $file 1 2 4 8 16 32 64 128
done
6) Added them to Geoserver (2.2 RC1) using ImageMosaic
Anything I have missed?
Russ
On 3 Aug 2012, at 09:24, Simone Giannecchini
<simone.giannecch...@geo-solutions.it> wrote:
> Ciao Russel,
> one thing, if you check the block size it is still not optimal as it
> is 4000x2 which means that your geotiff are saved on disk in stripes
> as large as the image itself but only 2 pixel tall.
> This is bad for performance as you'll end up reading much more data
> than needed for many requests.
> I would suggest to retile your geotiff images (with deflate
> compression) using a tile size (block size) of 256 or 512 pixels.
>
> Regards,
> Simone Giannecchini
> ==
> Our support, Your Success! Visit http://opensdi.geo-solutions.it for
> more information.
> ==
>
> Ing. Simone Giannecchini
> @simogeo
> Founder/Director
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
> fax: +39 0584 962313
> mob: +39 333 8128928
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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