[pdal] EPT points in polygon with the C++ API

[Howard Butler]

> On Feb 4, 2020, at 8:59 AM, Andrew Bell <andrew.bell.ia at gmail.com> wrote:
> 
> The PDAL EPT reader will do this for you.  See the `polygon` option.  The PDAL point-in-polygon algorithm seems to be better than most.  It's optimized for checking many points in a polygon.  I believe that the algorithm source is documented in the code.

Note that efficient polygon culling in the PDAL EPT reader is planned for release in PDAL 2.1. You'll need to build master from source if you need it just now.