Definition of GEDI lidar

Photonics Dictionary

GEDI lidar: The global ecosystem dynamics investigation (GEDI) lidar is a state-of-the-art spaceborne instrument designed to study Earth's forests and ecosystems in three dimensions. Developed by NASA, GEDI is part of the International Space Station (ISS) payload and is operated by NASA's Goddard Space Flight Center.

Lidar technology: Lidar (light detection and ranging) is a remote sensing technique that uses laser pulses to measure the distance to Earth's surface. GEDI lidar emits laser beams toward the Earth's surface and measures the time it takes for the laser pulses to reflect back, allowing it to precisely measure the height and structure of forests and vegetation.

Three-dimensional mapping: GEDI lidar provides detailed 3D maps of forest structure, including canopy height, canopy density, and vertical distribution of vegetation. This information is crucial for understanding ecosystem dynamics, carbon cycle processes, habitat structure, and biodiversity.

High precision and resolution: GEDI lidar has high precision and spatial resolution, allowing it to capture fine-scale details of forest structure and topography. It can measure vertical heights with an accuracy of a few centimeters and has a footprint size of about 25 meters on the ground.

Global coverage: GEDI lidar is mounted on the ISS, providing near-global coverage of Earth's forests between latitudes 51.6 degrees north and south. It scans the Earth's surface along the ISS orbit track, providing repeat observations over time to monitor changes in forests and ecosystems.

Scientific objectives: The primary scientific objectives of GEDI lidar include quantifying forest biomass, carbon storage, and forest disturbance; improving global carbon cycle models; assessing forest structure and dynamics; and supporting ecosystem management and conservation efforts.

Applications: GEDI data has a wide range of applications, including carbon accounting for climate change mitigation efforts, monitoring forest health and biodiversity, assessing deforestation and land-use change, and supporting forest management and conservation initiatives.

GEDI lidar represents a significant advancement in remote sensing technology for studying Earth's forests and ecosystems. Its high precision, global coverage, and 3D mapping capabilities provide valuable data for understanding and managing Earth's vital forest resources.