4sm-demonstration-4

4SM demonstrator step 0

Archiver

Remove/erase all image_specific files and directories
1. apart from a few shapefiles
2. apart from the 4SM script
3. apart from the following directories
  1. /4sm.calls/...
  2. /data/...
  3. /seatruth/...
  4. /OPF/...

4SM demonstrator step 1

Create database structure

write PCIDSK header file in FILE format
write void U8, U16, S16 and R32 channels

4SM demonstrator step 2

Importer

Import the raw data from /data/... for all bands into raw data channels

4SM demonstrator step 3

Importer

Ensure that raw radiance is >=1 for all data pixels
Create a Panchromatic band (if appropriate),
1. and write it in place of designated band

4SM demonstrator step 4

Scaler

Scale the raw spectral data to the 8 bits range 0-255
1. for image display purpose only
2. and write into designated U8 channels

4SM demonstrator step 5

AutoCalibrator

create a mask in designated channel
1. map all NoData pixels to 239 in the special effects mask
2. use Lsw.shp shapefile to extract spectral deep water radiance Lsw
3. use LsM.shp shapefileb to extract spectral radiance LsM of bright bare soil like bright beach sand
4. use glint.sh to extract the sea-surface glint regressions for all pairs of bands
5. use various other shapefiles to populate the special effects mask as required

4SM demonstrator step 6

AutoCalibrator

Now that the special effect mask is available
1. extract calibration data from the image
2. then produce and display a provisory commandline in textfile AutoCAL.txt
3. then produce and display a provisory AutoCalibration plot

4SM demonstrator step 7

Importer

Import seatruth DTM, if available

4SM demonstrator step 8

Extractor

Perform a proper extraction of calibration data from the image

4SM demonstrator step 9

Calibrator

Produce and display the image_specific optical calibration plot
1. for bands NIR, RED, GREEN and BLUE
2. for specified value of the ratio K_i/K_j
3. at specified wavelengths WL_i and WL_j

4SM demonstrator step 10

Typer
not using the panchromatic band

Use training site shapefiles to extract and display bottom type signatures
Write bottom type signatures text file

4SM demonstrator step 11

Modeling
Bottom typing
Seatruth evidence

not using the panchromatic band yet

Now that all parameters and bottom type signatures are specified

Modeler: process the image
1. Classify: during this run, also arrange to classify bottom types "on the fly"
2. CalibratePan: during this run, also arrange to extract/optimize the optical calibration of the panchromatic band "on the fly"
Modal_filter: then run a Modal_filter on the bottom types map and write it to specified channel
Seatruth: then compute the seatruth difference image ZRecorded+Htide-ZComputed
1. and display a seatruth evidence plot

4SM demonstrator step 12
as of step 12, 4SM now uses the panchromatic band

At this stage, the processing is finished

retrieved depth image is available for viewing
bottom typing image is available for viewing
the optical calibration of the panchromatic band has been estimated

Now that we have secured
proper results and seatruth evidence,

we take a chance that results
might be improved thanks to the panchromatic band

Calibrator

Compute and display a calibration plot involving the panchromatic band
1. that's for bands NIR, PAN, GREEN and BLUE
2. for specified value of the ratio K_i/K_j
3. at specified wavelengths WL_i and WL_j

4SM demonstrator steps 13 to 16

Modeling
Bottom typing
Seatruth evidence

using the panchromatic band

exactly the same as step 11, except for the panchromatic band
Now that all parameters and bottom type signatures are specified

Modeler: process the image
1. Classify: during this run, also arrange to classify bottom types "on the fly"
Modal_filter: then run a Modal_filter on the bottom types map and write it to specified channel
Seatruth: then compute the seatruth difference image ZRecorded+Htide-ZComputed
1. and display a seatruth evidence plot

e tutto finito May 2nd 2014