The publication on actual canopy scenarios from the fifth phase of the Radiation Transfer Model Inter-comparison (RAMI) exercise is now available.
This document summarizes the main outcomes of the workshop on Radiative Transfer Modelling support to Earth Observation (EO) metrology and Cal/Val activities held the 7-9 June 2023 in Varese (IT). RAdiation transfer Model Intercomparison (RAMI) offers a long-term framework to benchmark models designed to simulate radiative transfer at or near the Earth's terrestrial surface as well as at the top-of-atmosphere.
This initiative has been instrumental in supporting rigorous Radiative Transfer Model (RTM) evaluation to support EO activities. With new-generation radiometers on board the Copernicus Sentinel platforms delivering data with unprecedented radiometric accuracy (often close to 2%), current retrieval methods and validation protocols should be carefully reviewed to make sure that they fully benefit from this improved accuracy of the delivered Level 1 Top of Atmosphere (ToA) data.
This updated Privacy Statement provides information about the processing and the protection of your personal data in the context of the workshop "RAMI workshop on Radiative Transfer Modelling support to EO metrology and Cal/Val activities".
The submission of results phase has been extended to 30 November 2022. However, we also request you to register your model for participation before the 10 October 2022.
A set of RAMI-V scenes in OBJ format are available at the link: https://dart.omp.eu/index.php#/doc in the sections "Actual canopies" and "Abstract canopies".
They are the result of the transcription of the information contained in the original RAMI-V pages carried out by the DART Team during their participation to RAMI-V. These files are to be considered as additional support to the RTM community and should not be considered in substitution of the information listed in the original pages describing the individual scenes.
Physical units appearing in Molecular Absorption section have been fixed as follow:
A new initiative dedicated to the benchmarking of coupled surface-atmosphere radiative transfer models.
The file RAMI5list.txt containing the list of experiments has been fixed for HET28_DIS_D2D scene as it contained one missing testcase. (md5 sum)
The second announcement regarding the new initiative dedicated to the benchmarking of coupled surface-atmosphere radiative transfer models. RAMI4ATM will be publicly opened in April 2022.
A new version (v2) of HET51_WWO_TLS scene has been obtained from the Wytham Woods 3D model: you can find more information here. This archive contains all the files needed to built HET51 version 2 (v2) scene. They can also be accessed individually on the presentation page.
We decided to extend the opening submission phase up to 30 November 2021.
HET08_OPS_WIN background reflectance is lambertian in RAMI-V, in contrast with the anysotropic properties assumed in RAMI-4. The description of the scene contained some refuse and has been updated in the "Spectral Properties" section only. Please, apologize for the misleading message in previous version of the page.
It is now considering submissions for its second special issue, Radiation Transfer Modeling With Radiation Transfer Model Intercomparison Vegetation Canopies. It aims to publish results related to the RAMI-V phase and is open to scientists who directly participate in RAMI-V, but also to those who use RAMI-I to RAMI-V vegetation canopies to model various RS data in other spectral and other research domains. Manuscripts may be submitted starting July 1, 2021 and through June 30, 2022: submission instructions here.
It is a new archive that includes all files needed to setup RAMI-V scenes and experiments, and a "readme.txt" file listing summary tables of the scenes, bands, measurements and other informations which can be useful to run your RAMI-V phase. A full list of experiment names is also included. (md5 sum).
An early announcement regarding the new initiative dedicated to the benchmarking of coupled surface-atmosphere radiative transfer models. RAMI4ATM will thus extend the RAMI to the simulation of satellite observations.
HET50_SAV_PRE: to improve performances of 3D codes the grassy part of the scene has been arranged in ~15k boxes hierarchically organized as
Two additional files are then released for the models which can benefit from this rearrangement: grass_grid.zip. Please see also the comment on the head of the ".def" version, which includes a note on the ".obj" version (point 4). Apart of this reorganization, with respect to the first issue of the scene (specifically grass.all.def), there is no change with respect the 200k plants to be instantiated which is still completely valid. For what concerns the overstorey, we found that some boxes (172 of 48847) produced warnings. They are listed in the file linked list_tree_warning.txt and we advise to comment them in the corresponding tree plant files, given you get the same issue.
As possible issues could arise with energy consevation at scene boundaries due to the sloping ground of the current implementation of the Wytham Wood forest, we decided to put this experiment in "stand-by". A further notice will follows as soon as the modified scenario will be issued.
HET09 and HET15: BEPE spectral properties were fixed for both the birchstand scenes. The corresponding files of the spectral properties, marked as _v2.txt, is now more explicit with respect to the properties of the different trees and additional comments were added
HET09 birchstand scene a typo was corrected in the definition of the BEPE leaf (the keyword “ssphere” was used instead of the correct “sphere”).
HET07 pinestand summer some broken links in the table related to "tree structure" description have been fixed.
