[gdal-dev] The slowness of gdal_grid

[Even Rouault]

Ari,

the slowness of gdal_grid when fed with a big number of point features is a 
known issue. See ticket #2411. I had attached a patch to speed up the 
process. You could give it a try.

Le Friday 31 October 2008 08:09:11 Ari Jolma, vous avez écrit :
> I'm doing some laser scanning data -> geotiff interpolations and I'm
> finding that they take some time - the current run has been going on for
> ~20 hours now.
>
> The current run is for a 3 by 2 kilometer area, which I'm interpolating
> into a raster with 1 m x 1 m cells. The data is in PostGIS but it
> shouldn't matter:
>
> gdal_grid -a invdist:radius1=10:radius2=10 -txe 3350505 3353786 -tye
> 6692068 6694105 -outsize 3281 2037 -of GTiff -ot Float32 -l nummela
> PG:dbname=nummela nummela.tiff
> Grid data type is "Float32"
> Grid size = (3281 2037).
> Corner coordinates = (3350504.500000 6694105.500000)-(3353786.500000
> 6692067.500000).
> Grid cell size = (1.000000 1.000000).
> Source point count = 2588809.
> Algorithm name: "invdist".
> Options are
> "power=2.000000:smoothing=0.000000:radius1=10.000000:radius2=10.000000:angl
>e=0.000000:max_points=0:min_points=0:nodata=0.000000"
>
> Any ideas how to make things faster? I did a interpolation to 2 m x 2 m
> raster earlier, which was faster but not very fast either.
>
> Best regards,
>
> Ari
>
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