[GRASS-user] Processing LiDAR data in GRASS GIS

[Benjamin Ducke]

On 05/03/2013 01:18 PM, Hamish wrote:
> jr.morreale wrote:
>> Then what would be the limit for grass7 with 4gb of ram, no
>> topology/database ? Can it handle billions of points ?
>

In my experience, it can (even GRASS 6), if:

a) you rasterize the input data directly (r.in.xyz,
as suggested by Hamish).

b) your file system supports files > 4GB (which really
just about anything except a VFAT formatted USB drive
should these days)

and

c) (in case you want to export the results for use
with another GIS) your GDAL has a GeoTIFF driver
that has 64 bit BigTIFF support enabled.

To save storage space, use single precision
floating point data if you can.

Best,

Ben

> I don't really know to be honest. Try the experimental approach
> and keep an eye on `top`, and let us know the results. :) See the
> grass wiki FAQ for a hint on adding temporary swap space on Linux
> if you need it.
>
> r.in.xyz can handle many billions of points without trouble for
> non-exotic statistical aggregations; memory use there is more a
> matter of raster region size and you can do multi-pass if memory
> is an issue on a really really huge region.
>
>
> Hamish
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-- 
Dr. Benjamin Ducke, M.A.
{*} Geospatial Consultant
{*} GIS Developer

   benducke at fastmail.fm