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... > Instruments > Earth Remote Sensing Instruments > Active Remote Sensing > Altimeters > Lidar/Laser Altimeters > GEDI

Preferred term

GEDI  

Definition

  • GEDI is a full-waveform lidar instrument that makes detailed measurements of the 3D structure of the Earth’s surface. Lidar is an active remote sensing technology (the laser version of radar) which uses pulses of laser light to measure 3D structure. The light is reflected by the ground, vegetation and any clouds and is then collected by GEDI’s telescope. These photons are then directed towards detectors, converting the brightness of the light to an electronic voltage which is then recorded as a function of time in 1 ns (15 cm) intervals. Time is converted to range (a distance) by multiplying by the speed of light. The recorded voltage as a function of range is the full-waveform. More Information: https://gedi.umd.edu/ (en)

Broader concept

Change note

  • 2018-08-30 07:13:50.0 [tstevens] Insert Concept add broader relation (GEDI [5218fe2e-bea7-4654-bc54-7b9ec5503b60,368103] - Lidar/Laser Altimeters [ec76ff59-7450-48a0-9152-7c3531e609fd,349079]);
  • 2018-08-30 07:15:36.0 [tstevens] insert AltLabel (id: null category: primary text: Global Ecosystem Dynamics Investigation language code: en); insert Definition (id: null text: GEDI is a full-waveform lidar instrument that makes detailed measurements of the 3D structure of the Earth’s surface. Lidar is an active remote sensing technology (the laser version of radar) which uses pulses of laser light to measure 3D structure. The light is reflected by the ground, vegetation and any clouds and is then collected by GEDI’s telescope. These photons are then directed towards detectors, converting the brightness of the light to an electronic voltage which is then recorded as a function of time in 1 ns (15 cm) intervals. Time is converted to range (a distance) by multiplying by the speed of light. The recorded voltage as a function of range is the full-waveform. language code: en);
  • 2018-12-03 11:21:41.0 [sritz] insert WeightedRelation (id: null related concept uuid: 93c5d18c-be62-46c4-9545-42f73a854d85 relationship type: null relationship value: null generated by: null);
  • 2018-12-03 11:22:36.0 [sritz] update WeightedRelation (Platform-Instrument); update WeightedRelation (1);
  • 2020-01-03 19:12:48.0 [sritz] update Definition (GEDI is a full-waveform lidar instrument that makes detailed measurements of the 3D structure of the Earth’s surface. Lidar is an active remote sensing technology (the laser version of radar) which uses pulses of laser light to measure 3D structure. The light is reflected by the ground, vegetation and any clouds and is then collected by GEDI’s telescope. These photons are then directed towards detectors, converting the brightness of the light to an electronic voltage which is then recorded as a function of time in 1 ns (15 cm) intervals. Time is converted to range (a distance) by multiplying by the speed of light. The recorded voltage as a function of range is the full-waveform. More Information: https://gedi.umd.edu/);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/5218fe2e-bea7-4654-bc54-7b9ec5503b60

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