[gdal-dev] help with gdaladdo overviews resolution

Imran Rajjad rajjad at gmail.com
Sat Jan 1 04:52:43 EST 2011


Hi list,

I`m trying to add overview to a geotiff files that is to be served
through geoserver's image mosaic plugin. I have generated overview of
the file but I`m not sure about what resoltuions to put in the
plugin's properties files.

this is my gdalinfo result of the file

D:\data\coverages>gdalinfo gt1.tif
Driver: GTiff/GeoTIFF
Files: gt1.tif
Size is 11765, 10031
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.2572235630016,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]
Origin = (74.288700237628234,31.564984425149991)
Pixel Size = (0.000002286186497,-0.000002286186497)
Metadata:
  AREA_OR_POINT=Area
  TIFFTAG_SOFTWARE=ERDAS IMAGINE
  TIFFTAG_XRESOLUTION=1
  TIFFTAG_YRESOLUTION=1
  TIFFTAG_RESOLUTIONUNIT=1 (unitless)
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (  74.2887002,  31.5649844)
Lower Left  (  74.2887002,  31.5420517)
Upper Right (  74.3155972,  31.5649844)
Lower Right (  74.3155972,  31.5420517)
Center      (  74.3021487,  31.5535181)
Band 1 Block=11765x1 Type=Byte, ColorInterp=Red
  Overviews: 5883x5016, 2942x2508, 1471x1254, 736x627
  Metadata:
    LAYER_TYPE=athematic
Band 2 Block=11765x1 Type=Byte, ColorInterp=Green
  Overviews: 5883x5016, 2942x2508, 1471x1254, 736x627
  Metadata:
    LAYER_TYPE=athematic
Band 3 Block=11765x1 Type=Byte, ColorInterp=Blue
  Overviews: 5883x5016, 2942x2508, 1471x1254, 736x627
  Metadata:
    LAYER_TYPE=athematic



previously this is how I added over views
D:\data\coverages>gdaladdo -r average gt1.tif 2 4 8 16


now I have to give a resolution for the imagic mosiac plugin for each
overview, is there anyway I can find the pixel resultion for each
overview.

regards,
Imran


-- 
I.R


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