This section describes the basic terminology and concepts used in the ALG software package.
Term | Description |
---|---|
Spectrally-dependent variables that define the light scattering and absorption processes within a planetary atmosphere as function of key input atmospheric variables, illumination conditions and observation geometry. Read more... | |
Attribute for RTM input variables that defines the system-independent types of values: INTEGER, FLOAT, STRING. | |
Array that replaces runtime computation through access and interpolation of its stored values. LUTs are defined by their grid points (also called "nodes") and output variables. A LUT grid point is a vector with the key input parameters/variables values that were input to run the computationally-expensive RTM. A LUT output variable is the generated output of process run at a given grid point. | |
Data file containing the necessary input parameters and variables that defines the generation of an atmospheric LUT through the execution of an RTM. | |
Attribute for RTM input variables that defines whether the variable is discrete (i.e., only admits a, typically INTEGER, value within a given discrete set) or continuous (i.e., admits any, typically FLOAT, value within a defined range). | |
Computer implementation of the numerical solution of a radiative transfer equation.. | |
Data file containing the software configuration parameters necessary to operate the ALG software package. | |
Continuous range of wavelengths in which the output LUT variables are defined (e.g., 500-780 nm). LUT output variables can be composed of one or more
(non-contiguous) spectral bands. | |
Acquisition of a given wavelength range by a remote sensing instrument and defined by its wavelength barycentre and FWHM width
(e.g., Sentinel-3/OLCI channel #1 is centred at 400 nm and has a FWHM width of 15 nm). | |
Attribute for RTM input variables that defines whether the variable can vary its value (dynamic) or is fixed (static) within an atmospheric LUT. | |
Attribute for RTM input variables that control the access of a variable to Basic, Medium or Advanced users |