[pdal] HeightAboveGround

[Andrew Bell]

Hi,

The dimension is created by the filter you reference using an algorithm. It
can be written to a LAS file using the "extra dimension" support of that
file format. See the "extra_dims" option here:
https://pdal.io/en/latest/stages/writers.las.html



On Thu, Jun 27, 2024 at 8:05 AM Schultz Schultz via pdal <
pdal at lists.osgeo.org> wrote:

> Hello,
>
> I am a beginner in pdal, python or any code based programs. I have worked
> with LiDAR point cloud but under terrascan/microstation in the past.
> Recently I have discovered this tool (PDAL) and I would like to learn to
> use it and to be able to create a complete classification pipeline. I have
> a problem though. I cannot understand how or where HeightAboveGround
> dimension is created. No matter what I did I could not see this dimension
> in a *.las file. Is it a virtual attribute(dimension)?, *.las file is not
> appropriate file type?...I have no idea. Hope that the question is not
> completely stupid. Any enlightenment will be well received. Thank you.
>
> Regards,
> S
>
> This is written on pdal website
> filters.hag_delaunay
> <https://pdal.io/en/2.7-maintenance/stages/filters.hag_delaunay.html#filters-hag-delaunay>
>
> The *Height Above Ground Delaunay filter* takes as input a point cloud
> with Classification set to 2 for ground points. It creates a new
> dimension, HeightAboveGround, that contains the normalized height values.
>
>
>
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>


-- 
Andrew Bell
andrew.bell.ia at gmail.com
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