treetops: Change the way threshold kernels deal with obliterated tops.

rskelly / treetops

Tree Top and Crown Delineation from Canopy Height Rasters

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treetops: Change the way threshold kernels deal with obliterated tops. #22

Closed rskelly closed 7 years ago

rskelly commented 7 years ago

Instead of simply deleting treetops on successive iterations with larger kernels:

The first kernel locates maxima as currently.
The second (etc.) kernel assigns the ID of a secondary top within the kernel to the primary top.
All tops are maintained as seeds for crown delineation.
Crowns are optionally merged based on the associations between primary treetop IDs and the associated secondary IDs.

rskelly commented 7 years ago

Parent ID assigned to subsumed tops by 9bb0f69. Crowns are delineated for all tops and can be merged in post-processing using the parent IDs. A top takes on the parent ID of its largest parent, which might be an issue if >2 thresholds are used.