[pdal] Colorization filter slow?

[Howard Butler]

Thomas,

Thanks for the great test case. The first issue is that the TIFF is striped instead of tiled. The way PDAL uses GDAL to fetch pixel information is indeed not so smart in that scenario, and it is part of the penalty we see.

Here's my baseline output with your TIFF and LAZ file.

> [hobu at pyro knudsen (las-srs-read-in-initialize)]$ time ~/dev/git/pdal/bin/pdal pipeline striped.xml
> 
> real	2m30.110s
> user	1m46.660s
> sys	0m42.637s

I tiled the TIFF with

> $ gdal_translate orto_6173_727.tif orth-tiled.tif -co TILED=YES

and I get the following output:

> [hobu at pyro knudsen (las-srs-read-in-initialize)]$ time ~/dev/git/pdal/bin/pdal pipeline -i tiled.xml
> 
> real	0m35.574s
> user	0m33.586s
> sys	0m1.068s

I will work on the PDAL part of it and get back to you.

Thanks again!

Howard