.. _plugin-bsdf-rtls:

Ross-Thick Li-Sparse reflection model (:monosp:`rtls`)
--------------------------------------------------------

.. pluginparameters::

 * - f_iso
   - |spectrum| or |texture|
   - :math:`f_{iso}`. Default: 0.209741
   - |exposed| |differentiable|

 * - f_geo
   - |spectrum| or |texture|
   - :math:`f_{geo}`. Default: 0.081384
   - |exposed| |differentiable|

 * - f_vol
   - |spectrum| or |texture|
   - :math:`f_{vol}`. Default: 0.004140
   - |exposed| |differentiable|

 * - h
   - |float|
   - :math:`h`. Default: 2.f
   - |exposed|

 * - r
   - |float|
   - :math:`r`. Default: 1.f
   - |exposed|

 * - b
   - |float|
   - :math:`b`. Default: 1.f
   - |exposed|

The RTLS plugin implement the Ross-Thick, Li-Sparse model proposed by
(Strahler et al, 1999) for the MODIS operational the BRDF model Version 5.0

Default parameters for :math:`f_k` parameters are taken from the RAMI4ATM
benchmark test cases defined by the JRC, for measures done using the Sentinel-2A
MSI band 8A spectral region (centered around 865nm):
https://rami-benchmark.jrc.ec.europa.eu