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

[Andrew Cunliffe]

Can anyone help with the syntax to calculate HAG (height above ground)
relative to an interpolated surface (following James McClain’s
contribution, #2520 <https://github.com/PDAL/PDAL/pull/2520>)?


I’ve tried:

{

    "type": "filters.hag",

    "delaunay": True

},



But the output HAG is clearly still being computed relative to the nearest
neighbour, rather than an interpolated surface as desired.  I’ve tried
*"delaunay_fan":
True*, and also including *“count”: 4* arguments, and have been looking
through GitHub (which led me to “delauney” rather "delaunay_fan") but still
haven’t succeeded.


What am I missing?


Thanks,

Andy
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