Hello, Okay, all of that is well-taken. Thank you for your response.
> If you're not interested in the pixel values, using GDALSuggestedWarpOutput2() is a better fit. Yes, my question was worded a bit unclearly: I am essentially interested in retrieving warped tiles so the pixels are of primary interest. Thank you, James McClain On Fri, Feb 15, 2019 at 4:58 AM Even Rouault <even.roua...@spatialys.com> wrote: > On vendredi 15 février 2019 00:06:28 CET James McClain wrote: > > Hello, > > > > If I may, I would like to a few questions regarding how best to use the > > GDALWarp function ( > > > https://github.com/OSGeo/gdal/blob/master/gdal/apps/gdalwarp_lib.cpp#L748-L7 > > 70) and the datasets that it creates. > > > > In particular, I am experimenting with using such datasets to read warped > > extents on an on-demand basis and in a thread-safe way. > > > > I have found that the VRT output format is lazy with respect to > computation > > and allocation which is great for my use case, but it appears not to be > > thread safe with respect to reading from a single warped dataset from > > multiple threads. > > No single GDALDataset object of any driver should be used simultaneously > by > multiple threads (this extends to any GDAL/OGR class instance). If this > seems > to work for GTiff, you're just lucky, but that might just fail as well. > If you need to access a dataset from several threads, each one should have > its > own GDALDataset object (so this won't work for the MEM driver) > > > > > On a more meta level, are datasets created by GDALWarp the right approach > > (if I want to lazy get warped extents in a thread-safe manner) or should > I > > look elsewhere? > > If you're not interested in the pixel values, using > GDALSuggestedWarpOutput2() > is a better fit. > > Even > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev -- "I prayed for freedom for twenty years, but received no answer until I prayed with my legs." -- Frederick Douglass
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