4SM WV2 buck island reef WL tide USVI

It takes a good seatruth dataset for one to embark on such refinement
A co-registered DTM is best
Regressing non-smoothed depth estimates against smoothed DTM is unfair
Not all the scatter is caused by noise in depth estimates, by far
I think this Lidar DTM has been heavily smoothed
I've got a lot to do, and I stand to learn a lot

Reference vs Final
from 0 to 5m wZ=5 : Red against Purple, Blue, Green and Yellow
from 0 to 9 m wZ=4 : Yellow against Purple, Blue, and Green
from 0 to 30 m wZ=3 : Green against Purple and Blue

Turbid plumes
dZ=100*(ZC-ZR)/ZR
Coral heads and mounds
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About tide correction
Water column corrected view
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June 10th 2013

Bottom typing by NOAA from aerial photos
in Kruse, 2003

Reference vs Final

4SM Reference Blind test Smoothed RMSE=1.68 m (N=339508, 0-30m)	4SM Final Parameters adjusted Smoothed RMSE=1.34 m (N=339485, 0-30m)
	Final: N=8.5 million pixels a tide height of 0.4 m has been added to ground truth depths depths are binned into 1 m classes
	coral heads and mounds coral heads are deglinted and smart-smoothed correctly coral heads are so dark that yellow and red bands are extinct: they are modeled by the 3 bands case: wZ=3 their computed depth is commonly overestimated by several meters this shows in the 4-10 m depth range in the above plot I can't think of a way to counter that in 4SM