RGM Extended Version (RGM2) is an extended RGM in optical and thermal ranges. RGM2 runs in Windows OS. Newly developed codes include single scattering lidar signals and transmittance calculations.
For large scenes, new scene sub-division methodology is created in RGM2 for BRF calculations:
generating large virtual vegetated scene with DEM;
dividing scene into sub-scenes;
running RGM per sub-scene with corrections of shadowing effect and multiple scattering;
merging BRF of sub-scenes to obtain the large scene BRF.
NOTE: Sub-division was not used for small abstract canopies. Lidar return signals are single collided waveform. The footprint is the same of the whole scene instead of 50m.
Reference
An extended 3-d radiosity graphics combined model for studying thermal emission directionality of crop canopy
Kallel A., An extended 3-d radiosity graphics combined model for studying thermal emission directionality of crop canopy (2007), IEEE Transactions of Geoscience and Remote Sensing, 45, 2900-2918, DOI: 10.1109/TGRS.2007.902272.
A realistic structure model for large-scale surface leaving radiance simulation of forest canopy and accuracy assessment
Huang, H., Chen, M. and Liu, Q., A realistic structure model for large-scale surface leaving radiance simulation of forest canopy and accuracy assessment (2009), International Journal of Remote Sensing, 30(20), 5421-5439, DOI: 10.1080/01431160903130911.
