[pdal] Attempting to filter out (1) Unclassified points flagged as Withheld

[Andrew Bell]

On Mon, Aug 2, 2021 at 5:39 PM Rose Phillips <RPhillips at linz.govt.nz> wrote:

> Hi pdal’ers
>
>
>
> These are my attempts to filter out (1) Unclassified Points flagged as
> withheld in LAS filers for further analyses.
>
> Any chance you guys can point to where I have gone wrong?
>
>
>
> pipelines I have tried using pdal 2.3.0: to filter out (1) unclassified
> points flagged as withheld;
>
>
>
> 1.
>
>
>
> {
>
>     "pipeline" : [
>
>     {
>
>         "type" : "readers.las",
>
>         "filename" : "input.las"
>
>     },
>
>                 {
>
>                                 "type":"filters.range",
>
>                                 "limits":"Classification![129:129]"
>
>                 },
>
>     {
>
>         "type" : "writers.las",
>
>         "a_srs" : "EPSG:2193+7839",
>
>         "filesource_id" : "0",
>
>         "filename" : "output.las"
>
>     }
>
>     ]
>
>   }
>

I think that this should filter out unclassified withheld points with LAS
1.2 and 1.3. With LAS 1.4, the withheld attribute is stored in the
"ClassFlags" dimension, so you'll need to use boolean logic with that
dimension and the "Classification" dimension to do what you want. You might
also use pdal info --enumerate to make sure that your data has the values
you think it does.

-- 
Andrew Bell
andrew.bell.ia at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/pdal/attachments/20210803/ca02ca08/attachment.html>