4SM negril85-tutorial-model1

command line from Calibration 1

nice -20 4SM.4.08 -Process -Origin/UofUpsala
-DB/negril85/31_1_0_0/4_1/500_500/98.362_192.214/1_1
-Mis/Jamaica/Negril/Landsat/TM/UpsalaU/UTM_19_008/0.030_0.030/22_NOV_1990
-LS/0255.0/255.0/255.0/255.0
-cWL/0.500/0.599/0.500/0.500_AutoCAL
-M/@000001/00002/00003/00004
@CP00090.0/023.0/011.0/005.0
@CP00087.0/022.0/011.0/005.0
@CP00085.0/021.0/011.0/005.0
@CP00082.0/020.0/011.0/005.0
@CP00079.0/019.0/011.0/005.0
-LsM/163.1/080.4/113.6/096.7_AutoCAL
-LsM/156.9/091.4/113.6/156.7
-LsM/192.2/118.7/150.4/211.0_cLM=1.360
-Lsw/066.5/017.1/011.3/005.9_AutoCAL
-dLsw000.0/000.0/000.0/000.0
-Lw/0007.7/001.5/000.0/000.0_AutoCAL
-Lm/0001.0/001.0/001.0/255.0
-KK1_2_0.8271/Knir4.500/mask_3
-KK1_2_0.5900/Knir4.500/mask_3
-Z/MSL0.00/n_1/RLBgb1.000_1.000/mask_3
-B/tclNe/Bmin0/cLM1    .36
@deglint/vRbaD/GlintM25.0
-extract/v/mBPL1/mask_3
-calibrate/v/BdSNpzG/BDh_12_13_34
-Model/mask_3
-Smooth/5/Smart+

Run this script

Results of First Model

image_Z250 in channel_8 fairly nice results	image_B in channel_10 mostly dark bottoms, except along the beach
image_WZ in channel_6 Most shallow pixels exhibit a null bottom detection in the Red band	image_WR in channel_7 Most pixels in the 0-6 m depth range require a fairly strong smoothing

Negative bottom contrast

Negative bottom contrast occurs whenever Ls-Lsw<Lm
Quite often an image does not exhibit any negative bottom contrast
Here, with so much seagrass thriving on a terrigeneous bottom, negative bottom contrast cannot be ignored
see Syntax_Z
with negative bottom contrast enabled, bottoms are still modeled, even though their bottyom reflectance may be less than that of the water in the Blue bands
This can be risky where the image is noisy

image_Z250 in channel_8
fairly nice results

-Z/MSL0.00/n_1/RLBgb1.000_1.0/mask_3
negative bottom contrast disabled

-Z/MSL0.00/N_1/RLBgb1.000_1.0/mask_3
negative bottom contrast enabled

toto

toto