Instruments
Active Optical
Scene Generator
The Scene Generator Module is in charge of simulating the link between the emitted flux of the active system (that is simulated in the Instrument module), with the measured flux of the scene .
As this is an active instrument, and the instrument characterisation is done in the instrument module, the Scene Generator shall model the inputs necessary to calculate the energy in the Instrument Module. These inputs are the ground echo simulation (albedo and transmission through the atmosphere), and the atmospheric return on the aerosols, clouds and molecules.
The simulation flow of the Scene Generator Module is shown in the diagram below:
Biblos.COTS This is Biblos COTS package with installation script. Script installs libraries:- kissFFT- boost- netcdf- zlib- hdf5- eigen
Biblos.Resampling The Resampling Block interpolates the input external image to the Scene Generator Module to the observation are as calculated by the Geometry Module. The external input image to this Block is either an image in Top-of-Canopy (TOC) reflectances or an image in the biophysical parameter. The output of the Block is the same (TOC or bio/geophysical parameter), resampled to the lat/lon grid defined in the geometry AOCS/Instrument coupling Block matrix. Input image should have a finer resolution than the observation area grid with already applied sampling factor. For each detector element, the Instrument Projection algorithm projects the pixel array onto the imaging area. The energy received depends on the Instantaneous Field Of View (IFOV) and pixel dimensions. In BIBLOS a constant nominal pixel size is considered. There is no attenuation considered due to pixel size. In the following equation, size_pixel is considered equal to size_ref.
Biblos.Commons This is a package common for all the Blocks and Modules. Commons contain helper functions e.g. for reading NetCDF or parsing XML files as well as Blocks and Modules interfaces.
Tool: Tiff to NetCDF converter BIBLOS works with NetCDF format for the images. This is a tool to convert Tiff to NetCDF. It is external to BIBLOS, the user shall convert the image offline. THe package includes an executable, a README file (with instructions) and an example auxiliary file.