Add 'binmode' to writers.gdal to support non-interpolated rasters #3215

[hobu]

No description provided.

[hobu]

Here's the distinction in count between "bin" mode and "distance" mode. In distance mode, writers.gdal interpolates to the range, and this includes counting points that influence that. In bin mode, it only counts points that are inside the bin. The latter is useful for stuff like lasgrid operations and rasterization of categorical data like Classification.

[adamsteer]

this is fantastic - directly useful, especially thinking about some old forest canopy structure work. Thanks!