[GRASS-user] Problem with Lidar Tools

[Markus Neteler]

On Fri, Oct 30, 2009 at 1:43 PM, kaipi <mapcollect at gmx.net> wrote:
> I am quite new to Grass and need to generate a DSM from Lidar data. Here is
> my workflow so far:
...
> v.lidar.edgedetection classifies the data into cat 1 and cat 2 (=Terrain or
> Edge ?). This seams to work.

Since you use 6.3 there is some confusion which has been fixed in 6.4 and
later.  A minute ago I have backported the correction for numbering of
terrain classification which is correctly as follows:

TERRAIN = 1
EDGE = 2
UNKNOWN = 3

(see also
http://grass.osgeo.org/grass64/manuals/html64_user/v.lidar.edgedetection.html
)

> The next step is v.lidar.growing. This tool
> should classify into 4 categories: TERRAIN SINGLE PULSE, TERRAIN DOUBLE
> PULSE, OBJECT SINGLE PULSE or OBJECT DOUBLE PULSE. But this does not happen.
> The cats still remain the same (cat1 and cat2) and the output looks
> identical to the output from v.lidar.edgedetection. v.lidar.growing seams to
> have no effect.
> Am I doing something wrong ?

Would you mind to update to 6.4? We have made a couple of fixes since 6.3.
If the problem persists, we could check it.

Markus