Le lundi 21 janvier 2013 20:15:42, Per Ohlson a écrit : > Hi, > I have two different geotiff-charts which have the same number of pixels, > and similar information when viewing in gdalinfo, but one misbehaves while > tiling. > For the problem chart, only the zoom levels 0-6 are tiled, but for the > correctly handled chart, zoom levels 4-11 are tiled. Both are around > 23000x15000 pixels and 72 dpi. > So, what decides the zoom levels? I thought it was pixels and dpi..
You probably don't give the whole context. From the gdalinfo output, I can tell that none of your geotiffs are tiled, or have overviews (precomputed zoom levels). So this may depend on the application that make use of them. > > gdalinfo on the working chart gives: > > Coordinate System is: > Size is 15108, 23181 > GEOGCS["WGS 84", > DATUM["WGS_1984", > SPHEROID["WGS 84",6378137,298.257223563, > AUTHORITY["EPSG","7030"]], > AUTHORITY["EPSG","6326"]], > PRIMEM["Greenwich",0], > UNIT["degree",0.0174532925199433], > AUTHORITY["EPSG","4326"]] > Origin = (167.635052101782918,-27.435225354710909) > Pixel Size = (0.000619744987014,-0.000517525434692) > Metadata: > AREA_OR_POINT=Area > Image Structure Metadata: > COMPRESSION=LZW > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left ( 167.6350521, -27.4352254) (167d38' 6.19"E, 27d26' 6.81"S) > Lower Left ( 167.6350521, -39.4319825) (167d38' 6.19"E, 39d25'55.14"S) > Upper Right ( 176.9981594, -27.4352254) (176d59'53.37"E, 27d26' 6.81"S) > Lower Right ( 176.9981594, -39.4319825) (176d59'53.37"E, 39d25'55.14"S) > Center ( 172.3166057, -33.4336039) (172d18'59.78"E, 33d26' 0.97"S) > Band 1 Block=15108x1 Type=Byte, ColorInterp=Red > Mask Flags: PER_DATASET ALPHA > Band 2 Block=15108x1 Type=Byte, ColorInterp=Green > Mask Flags: PER_DATASET ALPHA > Band 3 Block=15108x1 Type=Byte, ColorInterp=Blue > Mask Flags: PER_DATASET ALPHA > Band 4 Block=15108x1 Type=Byte, ColorInterp=Alpha > > gdalinfo on the problem chart gives: > Size is 15319, 23593 > Coordinate System is: > GEOGCS["WGS 84", > DATUM["WGS_1984", > SPHEROID["WGS 84",6378137,298.257223563, > AUTHORITY["EPSG","7030"]], > AUTHORITY["EPSG","6326"]], > PRIMEM["Greenwich",0], > UNIT["degree",0.0174532925199433], > AUTHORITY["EPSG","4326"]] > Origin = (176.502369113268770,-25.635284667174400) > Pixel Size = (0.000619910224237,-0.000526829594898) > Metadata: > AREA_OR_POINT=Area > Image Structure Metadata: > COMPRESSION=LZW > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left ( 176.5023691, -25.6352847) (176d30' 8.53"E, 25d38' 7.02"S) > Lower Left ( 176.5023691, -38.0647753) (176d30' 8.53"E, 38d 3'53.19"S) > Upper Right ( 185.999, -25.635) (185d59'55.59"E, 25d38' 7.02"S) > Lower Right ( 185.999, -38.065) (185d59'55.59"E, 38d 3'53.19"S) > Center ( 181.251, -31.850) (181d15' 2.06"E, 31d51' 0.11"S) > Band 1 Block=15319x1 Type=Byte, ColorInterp=Red > Mask Flags: PER_DATASET ALPHA > Band 2 Block=15319x1 Type=Byte, ColorInterp=Green > Mask Flags: PER_DATASET ALPHA > Band 3 Block=15319x1 Type=Byte, ColorInterp=Blue > Mask Flags: PER_DATASET ALPHA > Band 4 Block=15319x1 Type=Byte, ColorInterp=Alpha > > Regards > /Per > > > > Per Ohlson, M.Sc. E.E. > Nanight AB - http://www.nanight.se > Stockholm/Gothenburg, Sweden > [email protected] _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
