[gdal-dev] Improvements in GDAL Grid 2.01 vs 1.11.2 report
nicolas.cadieux at archeotec.ca
nicolas.cadieux at archeotec.ca
Wed Dec 16 10:13:25 PST 2015
Hi,
I have been using Gdal_Grid to interpolate LiDAR files. I use the NN
algorithm. I order to reduce any border effect, I have been stitching
all of my files together creating one big file.
This created problems. The first being the GDAL_Grid had a 16mb buffer
and needed to recalculate the quad tree for each work buffer. I was
instructed to increase the buffer and to recompile Gdal_grid.
These are the result for creating a NN raster using a 3 x 3 search
radius for 517 127 949 points.
Gdal 1.11.2 with 16mb buffer: no results. I pulled the plug after 3
week of processing. (I had about 2 1/2 months to go!).
Gdal 1.11.2 recompiled with a 1.5GB buffer: 4h46 min
Gdal 2.1.0 dev released 2015/99/99 (downloaded binaries. This version
now has no need to recalculate the quad tree for each work buffer: 1h22min.
This is on a Intel i7 extreme edition with 6 core + hyper threading
turned on. 64GB of ram, SSD drive.
Both files look the same (will report back if not) except for the fact
that the Gdal 2.1.0 version has no data values in the file (and the
1.11.2 version has -32768) so that is an added extra bonus.
Thanks for you work.
Nicolas Cadieux
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