[pdal] Performance Question

[Dan Mullins]

Thanks for the reply and information. I'll do my best to keep it general
and avoid free solutioning.

I've read the addon section about a dozen times and can't wrap my head
around it. In the example, "~/entwine/addons/autzen/smrf" looks like a
file, but I don't know what's in it. Is there documentation on how to
create your own addon?

Dan


On Tue, May 21, 2024 at 7:58 AM Howard Butler <howard at hobu.co> wrote:

>
>
> On May 21, 2024, at 1:57 AM, Dan Mullins via pdal <pdal at lists.osgeo.org>
> wrote:
>
> Hello -
>
> We would like to store our data (points + point specific data) in an
> Entwine point cloud. We've been testing a subset (~35m points) and noticed
> some strange performance. When we give the reader.ept a polygon, the
> response time for just X/Y/Z data is really fast. It returns ~15k points in
> 1s. When we create the ept with our additional data attributes (8 total),
> it slows down to 6s. Is this expected? If so, are there ways to improve the
> performance?
>
>
> Extra byte dimensions in LAZ are poorly compressed, so it might be that
> you're simply fetching a lot more bytes. Maybe it makes more sense to use
> EPT Addons https://pdal.io/en/latest/stages/writers.ept_addon.html instead
> of extra byte dimensions.
>
> Can we pick which columns of data we want returned?
>
>
> Selective access and decompression is something that's possible but not
> yet implemented.
>
> Howard
>
> PS, do note that you are going to quite quickly move from
> help-us-with-open-source-software to
> consult-with-us-to-tell-us-how-to-exploit-this-software-the-best with this
> topic.
>
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