I’m trying to perform atmospheric corrections on a non supported satellite image formatted as a three layers Uint16 tiff, according to OpticalCalibration help (OpticalCalibration — Orfeo ToolBox 8.1.2 documentation).
The three layers correspond to RGB channels (Digital Numbers) of an optical sensor and I’m using the otbcli_OpticalCalibration function called by command line.
I can set all geometric, radiometric and atmospheric parameters correctly, but it seems is not possible to set the values of the wavelengths (or wavebands) of the three channels.
As a consequence, otbcli_OpticalCalibration use the same selfdefined WL value for all the bands (i.e. 0.65 microns) and, therefore, the atmospheric correction is wrong.
Is it possible to set the proper WL/WB values for the different layers in someway?
PS:
the mapla GUI of OpticalCalibration app doesn’t have a box where indicates the image wavebands.
I’m using OTB 8.1.2 for Windows 10 (64 bit)
Thank you in advance for your attention.
Paolo
Below I annexed the printout of the otbcli_OpticalCalibration run.
otbcli_OpticalCalibration -in \IMG_RGB.tif -level toc -acqui.day 24 -acqui.month 5 -acqui.year 2020 -acqui.sun.elev 64.7496 -acqui.sun.azim 148.636 -acqui.view.elev 87.7811 -acqui.view.azim 37.1722 -acqui.gainbias gainbias.txt -acqui.solarilluminations solarirradiance.txt -out provaTOC_TiffRGB_CMD.tif
2023-08-23 09:57:16 (INFO): Loading metadata from official product
2023-08-23 09:57:16 (WARNING): The SensorTransform factory could not find a compatible Sensor Transform
2023-08-23 09:57:16 (WARNING): The SensorTransform factory could not find a compatible Sensor Transform
2023-08-23 09:57:16 (WARNING): The SensorTransform factory could not find a compatible Sensor Transform
2023-08-23 09:57:16 (INFO) OpticalCalibration:
File: IMG_RGB.tif
Sensor unknown!
Additional parameters are necessary, please provide them (cf. documentation)!
2023-08-23 09:57:16 (INFO) OpticalCalibration: Default RAM limit for OTB is 256 MB
2023-08-23 09:57:16 (INFO) OpticalCalibration: GDAL maximum cache size is 811 MB
2023-08-23 09:57:16 (INFO) OpticalCalibration: OTB will use at most 8 threads
2023-08-23 09:57:16 (INFO) OpticalCalibration: Using Acquisition gain from the user file (per band): [9.75, 9.82, 10.96]
2023-08-23 09:57:16 (INFO) OpticalCalibration: Using Acquisition biases from the user file (per band): [0, 0, 0]
2023-08-23 09:57:16 (INFO) OpticalCalibration: Compute Top of Canopy reflectance
2023-08-23 09:57:16 (WARNING) OpticalCalibration: No relative spectral response found, using default response (constant between 0.3 and 1.0┬╡m)
2023-08-23 09:57:17 (INFO) OpticalCalibration: Atmospheric correction parameters compute by 6S :
AtmosphericCorrectionParameters (000001F0C69985F0)
Atmospheric pressure : 1030
Water vapor amount : 2.5
Ozone amount : 0
Aerosol model : 0
Aerosol optical : 0.2
AtmosphericRadiativeTerms (000001F0C86DB960)
3 channels:
Channel 0 :
Intrinsic Atmospheric Reflectance : 0.0529803
Shperical Albedo of the Atmosphere : 0.092017
Total Gaseous Transmission : 0.931485
Atmosphere Downward Transmittance : 0.922395
Atmosphere Upward Transmittance : 0.928683
Upward Diffuse Transmittance : 0.0621766
Upward Direct Transmittance : 0.866507
Rayleigh Upward Diffuse Transmittance : 0.0729438
Aerosols Upward Diffuse Transmittance : 0
Wavelength : 0.65
Channel 1 :
Intrinsic Atmospheric Reflectance : 0.0529803
Shperical Albedo of the Atmosphere : 0.092017
Total Gaseous Transmission : 0.931485
Atmosphere Downward Transmittance : 0.922395
Atmosphere Upward Transmittance : 0.928683
Upward Diffuse Transmittance : 0.0621766
Upward Direct Transmittance : 0.866507
Rayleigh Upward Diffuse Transmittance : 0.0729438
Aerosols Upward Diffuse Transmittance : 0
Wavelength : 0.65
Channel 2 :
Intrinsic Atmospheric Reflectance : 0.0529803
Shperical Albedo of the Atmosphere : 0.092017
Total Gaseous Transmission : 0.931485
Atmosphere Downward Transmittance : 0.922395
Atmosphere Upward Transmittance : 0.928683
Upward Diffuse Transmittance : 0.0621766
Upward Direct Transmittance : 0.866507
Rayleigh Upward Diffuse Transmittance : 0.0729438
Aerosols Upward Diffuse Transmittance : 0
Wavelength : 0.65
2023-08-23 09:57:17 (INFO) OpticalCalibration: Clamp values between [0, 100]
2023-08-23 09:57:17 (INFO): Estimated memory for full processing: 7744.24MB (avail.: 256 MB), optimal image partitioning: 31 blocks
2023-08-23 09:57:17 (INFO): File provaTOC_TiffRGB_CMD.tif will be written in 32 blocks of 9999x163 pixels
Writing provaTOC_TiffRGB_CMD.tif…: 100% [**************************************************] (8s)