[pdal] Syntax for implementing new filters.hag relative to TIN

[James McClain]

Hello,

It isn't necessarily the case that the parameter will be low for any given
dataset.  For example, if you have a dataset with recognizable scan lines
with a relatively small distance between subsequent samples, but the scan
lines are relatively far apart.

A workable parameter-free approach would definitely be superior to what is
currently there, though.

Sincerely,
James McClain



On Mon, Nov 11, 2019 at 7:52 AM Andrew Bell <andrew.bell.ia at gmail.com>
wrote:

>
>
> On Mon, Nov 11, 2019, 06:12 Andrew Cunliffe <andrewmcunliffe at gmail.com>
> wrote:
>
>> Thanks for the help Andrew,
>>
>> Unfortunately this pipeline {"type": "filters.hag", "count": 4,
>> "delaunay": 'true'}, is still throwing exceptions (non-zero Python exit
>> code).
>>
>> I can imagine setting a larger count (e.g. 20-30) reduces the likelihood
>> that the point under consideration lies beyond the interpolated TIN
>> surface, but is it not possible to create a TIN from  ≥ 3 ground points?
>> (Shouldn't this be fine as long as all the non-ground points lie within the
>> extent of the triangle?)
>>
>
> Yes, but you have to choose the"right" points. I may be able to change
> things so that this parameter isn't necessary. If you can share your data,
> I'd love to use it as a test case and to experiment with the issue you're
> having.
>
>>
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-- 
James McClain
Software Developer
Azavea  |  990 Spring Garden Street, 5th Floor, Philadelphia, PA 19123
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