On 11-04-20 11:32 AM, Francisco José Reyes Peralta wrote:
Dear friends,
Using gdalinfo and my dataset i obtain the following data:
*Size: 35000, 20000*
*Pixel Size: 0.5, -0.5*
*Band 1 Block = 35000x1 Type=Byte, ColorInterp=Red*
*Overviews: 17500x10000, 8750x5000, 4375x2500, 2187x1250, 1093x625, 546x312,
273x156*
*Band 2 Block = 35000x1 Type=Byte, ColorInterp=Green*
*Overviews: 17500x10000, 8750x5000, 4375x2500, 2187x1250, 1093x625, 546x312,
273x156*
*Band 3 Block = 35000x1 Type=Byte, ColorInterp=Blue*
*Overviews: 17500x10000, 8750x5000, 4375x2500, 2187x1250, 1093x625, 546x312,
273x156*
How can I recognize my optimal blocksize to open a 250 MB ecw file in TILES
mode because if I read all the dataset I obtain an outofmemory exception.
Francisco,
I believe you will get the best performance reading it one scanline at a time
with all bands at once. There is a special optimized case in the driver for
this. But you would need to use the GDALDataset::RasterIO() method to read
all three bands at once instead of reading them each separately.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
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and watch the world go round - Rush | Geospatial Programmer for Rent
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