[pdal] filter.crop option "ogr"

[Howard Butler]

What does your pipeline look like?

> On Mar 31, 2025, at 9:11 AM, Roland Spielhofer via pdal <pdal at lists.osgeo.org> wrote:
> 
> Thanks Howard for clarifying this.
> The reason why I am trying to use filters.crop is the following:
> I am trying to find the max(z) in each of a number of polygons.
> I found
> https://stackoverflow.com/questions/75907829/can-pdal-be-used-to-find-the-max-point-in-each-of-a-set-of-polygons
> that exactly describes what I want to do, but I do not have the WKT geometries.
>  
> When I use the filters.assign and filters.expression workflow, I get only one single point, not one per polygon.
>  
> Is there a difference how filters.crop works compared to filters.assign/filters.expression that effects the outcome of filters.locate?
>  
> Regards,
> Roland
>  
> Gesendet: Montag, 31. März 2025 um 15:43
> Von: "Howard Butler" <howard at hobu.co>
> An: "Roland Spielhofer" <rspiel at gmx.net>
> CC: pdal at lists.osgeo.org
> Betreff: Re: [pdal] filter.crop option "ogr"
> Roland,
>  
> This feature is a 2.9.0+ thing, which has not been released yet.
>  
> https://pdal.io/en/2.8.4/stages/filters.crop.html doesn't show any 'ogr' option. You can achieve a similar outcome by using filters.assign to label points and filters.expression to cull them https://pdal.io/en/2.8.4/workshop/manipulation/clipping/clipping.html#workshop-clipping
>  
> Howard
> 
> On Mar 31, 2025, at 8:40 AM, Roland Spielhofer via pdal <pdal at lists.osgeo.org> wrote:
> 
> Hi,
> I am trying to use the option "ogr" in filters.crop.
>  
> ...
> {
>         "type":"filters.crop",
>         "ogr":{
>             "type":"ogr",
>             "datasource": ["Buffers.shp"],
>             "drivers":"ESRI Shapefile"
>         }
>      },
> ...
>  
> When doing so, I get
> "PDAL: filters.crop: Unexpected argument 'ogr'."
>  
> My version:
> (lidar) Q:\.....\PDAL>pdal --version
> --------------------------------------------------------------------------------
> pdal 2.8.4 (git-version: Release)
> --------------------------------------------------------------------------------
> on Windows/Conda
>  
> Is "ogr" already included in v2.8.4?
>  
> Thanks!
> Roland
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