Find and document degenerate Delaunay triangulation in 3DEP

[echeipesh]

In #54 we're talking about using the PDAL provided no-cull option to "correctly" generate TINs in regions where the bounding box is inside the convex hull.

This issue is to find a boundary region in 3DEP dataset that misbehaves, producing incorrect TIN without reference points produced through the no-cull option. It would be helpful to have a specific case to center our discussions around.

Outcome:

• BBOX
• Raster of invalid region from the TIN
• Raster of valid region (with expanded bounded box that includes needed points)

[jpolchlo]

This issue is still outstanding. We need to examine a variety of 3DEP areas that contain reasonably-sized water bodies—the only areas allowed to have data voids. I've been trying to use WCS, but for whatever reason, it is failing to zoom in on the pointcloud when we try to look closer, so the voids are hard to discover. We can switch over to WMS or WMTS, though those services appear to fail at higher resolutions? (Is that correct, @pomadchin?)

Once we can properly inspect a pointcloud, we can extract such a region. See #54 for a description of the characteristics of the desired extent.

[pomadchin]

Yep, WMS and WMTS properly handle resolutions at this point.