| The purpose is to compare - NOOA's method operated in 4SM RLNmode
- with 4SM method in PANmode
As we have estimated spectral La, it is possible to operate NOAA's method where - Z=bias+slope*ln(Lsblue-Lablue)/ln(Lsgreen-Lagreen)
Slope : in 4SM slope is #1.0, no babbling! - this is because all BOA radiances are normalized to the range 0-200
Bias : it is to be estimated against some seatruth - in 4SM, we regress ZRLN against Z3 -which is taken to be seatruth-,
- and adjust the bias as desired
- depths over very brigher bottoms can only be overestimated in Stumpf's method
- depths over very darker bottoms can only be underestimated in Stumpf's method
- then what if the seatruth dataset does not represent the whole depth range over the whole bottom brightness range in a fair way?
- For RLN modeling
- -Z/MSL0.00/RLN_0.96_21.5/n_1/RLBgb1.220/mask_4
- this disables the PANmode and enables the RLNmode
- Enable the RLN mode and run the script
- parameters are: bias Mzero=0.96 and slope Mone=21.5
- they are set manually using a sea-truth regression or -ProfileAB/R/...
- Lm threshold parameter is enforced: only pixels with Lr[2]>=Lm[2] are modeled.
- tide correction is automatically disabled in RLNmode
- For RLN seatruth regression
- -RegressZZv/p/seatruth*depth_points_reproject_pruned/ZM/2_3/0_201/0_30_2.0/*
- and run the script
- See a comparison of the two methods; scatter plot compares computed depths
- I obtained these results in 2003
|
