[GRASS-dev] [EXTERNAL] [GRASS GIS] #3560: r.in.lidar: error to open valid LAZ file

Newcomb, Doug doug_newcomb at fws.gov
Wed May 9 13:14:02 PDT 2018


On Wed, May 9, 2018 at 4:02 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Wed, May 9, 2018 at 9:37 PM, Newcomb, Doug <doug_newcomb at fws.gov>
> wrote:
> > On Wed, May 9, 2018 at 3:21 PM, Markus Neteler <neteler at osgeo.org>
> wrote:
> >>
> >> Doug,
> >>
> >> On Wed, May 9, 2018 at 9:17 PM, Newcomb, Doug <doug_newcomb at fws.gov>
> >> wrote:
> >> > Markus,
> >> > Liblas reads LAS version 1.2 , which is limited to 4.2 billion points.
> >>
> >> I see. But "count" states 297.683.873 which is way less points?
> >
> > Good question
> >
> >> > You have to compile liblas with an older version of laszip .
> >>
> >> Uhm, why an _older_ version?
> >
> > The API to LASzip changed with version 3.   I use LASzip 2.2.0 compiled
> with
> > liblas from 2013 and have no problems so far.   https://laszip.org/ The
> most
> > recent version of 3  was for version 1.4 of the LAS spec.
> >
> > You need to compile current pdal and current  liblas with different
> versions
> > of the Laszip library .
>
> On that machine is PDAL-1.7.0 (wit patches) which requires laszip 3.2.x.
>
> So, to compile liblas with an older laszip would be tricky.
>

On the machine I am using for this  , I have compiled the old laszip as the
system laszip library and compile but do not install the newer one.  I then
point pdal to the directory with the newer version when compiling it.  So
far, that seems to work.


>
> > pdal used to output version 1.2 of las data by default . I t worked fine
> for
> > me at version 1.6 . I have not checked if that is the case with version
> > 1.7.1 .  1.7 had a bug which required a quick bugfix to 1.7.1, by the
> way. (
> > I do not recall the bug off of the top of my head.)
>
> The solution would be the implementation of r.in.pdal:
> https://trac.osgeo.org/grass/ticket/3515


>
> to get rid of liblas which is not developed any more.


> And/or package laz-perf.... sigh, so many hours already spent on
> packaging...
>
> Markus
>
>
Doug

-- 
Doug Newcomb
USFWS
551F Pylon Dr
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov
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