LESS¶

3D Radiative Transfer Model

Version 3.0.0rc1

Welcome to LESS - 3D radiative transfer model supporting CPU, NVIDIA OptiX and cross-vendor Vulkan GPU.

This tutorial will start from basic concepts and guide you from shallow to deep using the less3d Python package to complete various remote sensing simulation tasks. LESS can run all public simulation functions on a regular CPU, compatible cross-vendor GPU or NVIDIA GPU. The three backends use the same set of API and result formats; the default Scene() selects the available backends based on the current machine. All examples use built-in sample data and require no additional downloads.

If you have any questions, please contact jianboqi@126.com

Preparation¶

Basic simulation¶

Spectrum and angle¶

Active remote sensing¶

11 - LiDAR Point cloud simulation

Radiation field and flux¶

11b - Uplink and downlink irradiance map (IrradianceMap)

Thermal infrared and physiological processes¶

Advanced features¶

Sample data¶

This tutorial uses two built-in 3D plant models:

Model	File	Description
European Ash (FREX)	`FREX.obj`	Deciduous tree, containing two components `leaves` and `stem_branch`
Corn (Maize)	`maize.obj`	Corn plant, single component

Get the sample data path:

import less

# Automatically decompress to a temporary directory and return the file path
tree_mesh = less.examples.asset_path("FREX.obj")
maize_mesh = less.examples.asset_path("maize.obj")