[Gdal-dev] I/O Performance issues with ENVI data format
sjahputerao at missouri.edu
Wed Mar 7 10:51:28 EST 2007
I have a C++ program that conducts UTM reprojection and resampling of
large images before creating the pansharpened multispectral images.
Initially, I was using GTiff format for the pansharpened image. For
16Kx16K panchromatic image (and its corresponding multispectral), it
took me about 50 minutes to finish the process. Then I tried using ENVI
format as a solution to the 4 GB limit of GTiff. The whole process
(using the same input images) now take more than 3 hours to complete.
Both programs were built using the release mode with the same
optimization options in VC.Net.
Both trials were run on the same machine with XP-SP2. Any idea why the
disk I/O with the ENVI format is much slower compared to the disk I/O
with the GTiff format?
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