This article needs to be updated. The reason given is: the article speaks of what it will do, when it's now nearing its end of life doi:10.1126/science.adf6250. Please help update this article to reflect recent events or newly available information. Last update: 2020-03-06(November 2022)
Global Ecosystem Dynamics Investigation (GEDI, pronounced /ˈdʒɛdaɪ/) is a NASA mission to measure how deforestation has contributed to atmospheric CO2 concentrations.[1][2] A full-waveform LIDAR was attached to the International Space Station to provide the first global, high-resolution observations of forest vertical structure. This will allow scientists to map habitats and biomass, particularly in the tropics, providing detail on the Earth's carbon cycle.[3]
Global Ecosystem Dynamics Investigation lidar (GEDI)
GEDI was competitively selected as a NASA Earth Ventures Instrument (EVI) mission in 2014. Cost-capped at $94 M, GEDI is led by the University of Maryland in collaboration with NASA Goddard Space Flight Center.[4]
Climate change is closely tied to that of the carbon cycle.[3] GEDI produces high resolution laser ranging observations of the 3D structure of the forests of Earth, which will provide answers to how deforestation has contributed to atmospheric CO2 concentrations, how much carbon forests will absorb in the future, and how habitat degradation will affect global biodiversity and the water cycle.[1] This, in turn, is also of value for weather forecasting, forest management, glacier and snowpack monitoring.[1] Overall, GEDI will help to better understand how the Earth behaves as a living system.
GEDI's LIDAR system provides precise geolocated elevation data that drastically improve global Digital Elevation Models (DEMs). Owing to the vast number of data points that GEDI is capable of collecting it will provide a stronger baseline for DEMs and remove more system errors compared to ICESat.[5]
It launched on 5 December 2018 on board a Falcon 9 and it is part of the SpaceX CRS-16 mission. It was mounted on the Japanese Experiment Module - Exposed Facility (JEM-EF) Kibo module for a two-year mission.[1][6] After three month, GEDI started collecting data for scientific use on March 25, 2019.[1] The mission is being led by Professor Ralph Dubayah of the University of Maryland. Once reaching the end of its two-year mission, GEDI will be removed from the JEM-EF and loaded into another Dragon Capsule trunk for disposal.[7]
Instrumentedit
The GEDI instrument is a geodetic-class, light detection and ranging (Lidar) laser system consisting of three lasers that produce eight parallel tracks of observations. Each laser fires 242 times per second and illuminates a 25 m spot (a footprint) on the surface over which 3D structure is measured. Each footprint is separated by 60 m along track, with an across-track distance of about 600 m between each of the eight tracks. GEDI is expected to produce about 10 billion cloud-free observations during its nominal 24-month mission length.[1][2][4]
Using an 80 cm telescope attached to the bottom of the instrument, GEDI will be able to receive the pulses of light that bounce back from the Earth' surface and collect information on the 3D structure of the area in question. Upon the optical bench, the instrument contains three Beam Dither Units (BDU), three beam expanders, three star trackers, and three HOMER lasers.[8] The three HOMER lasers built and installed on GEDI were built by D. Barry Coyle, Furqan L. Chiragh, and Erich A. Frese.
The GEDI instrumentation is designed to collect data between 51.6° N latitude and 51.6° S latitude. Within this area, GEDI gathers data from approximately four percent of the earth's surface, including both tropical and temperate forests.[9]
The LIDAR system can only operate effectively over relatively cloud free areas. Dense cloud cover blocks the laser pulses and prevents accurate measurements.[9]
GEDI uses an active across-track pointing system in order to help show area that is not normally covered due to the International Space Station's orbit pattern. These occur because the ISS is not maintained in a repeating orbit and can get stuck in orbital resonances that essentially repeat orbital tracks and result in large coverage gaps.[9]
Referencesedit
^ abcdefGEDI Ecosystem LIDAR. Home site. Accessed on 1 December 2018.
^ abNASA probe will reveal 3D architecture of forests from space. Richard Moss, New Atlas. 14 September 2014.
^ abNASA has a plan to take the most detailed scans of the world's forests ever. Pierre Bienaimé, Business Insider - UK. 3 March 2015.
^ abcDubayah, Ralph; Blair, James Bryan; Goetz, Scott; Fatoyinbo, Lola; Hansen, Matthew; Healey, Sean; Hofton, Michelle; Hurtt, George; Kellner, James; Luthcke, Scott; Armston, John (2020-06-01). "The Global Ecosystem Dynamics Investigation: High-resolution laser ranging of the Earth's forests and topography". Science of Remote Sensing. 1: 100002. Bibcode:2020SciRS...100002D. doi:10.1016/j.srs.2020.100002. ISSN 2666-0172.
November 13, 2023
global, ecosystem, dynamics, investigation, gedi, redirects, here, other, uses, gedi, disambiguation, this, article, needs, updated, reason, given, article, speaks, what, will, when, nearing, life, 1126, science, adf6250, please, help, update, this, article, r. GEDI redirects here For other uses see Gedi disambiguation This article needs to be updated The reason given is the article speaks of what it will do when it s now nearing its end of life doi 10 1126 science adf6250 Please help update this article to reflect recent events or newly available information Last update 2020 03 06 November 2022 Global Ecosystem Dynamics Investigation GEDI pronounced ˈ dʒ ɛ d aɪ is a NASA mission to measure how deforestation has contributed to atmospheric CO2 concentrations 1 2 A full waveform LIDAR was attached to the International Space Station to provide the first global high resolution observations of forest vertical structure This will allow scientists to map habitats and biomass particularly in the tropics providing detail on the Earth s carbon cycle 3 Global Ecosystem Dynamics Investigation lidar GEDI OperatorNASAManufacturerGoddard Space Flight CenterInstrument typeLIDARFunction3D structure of forestsMission duration2 yearsWebsitescience wbr nasa wbr gov wbr missions wbr gedi wbr Host spacecraftSpacecraftInternational Space StationLaunch date5 December 2018RocketFalcon 9 Block 5Launch siteCape Canaveral SLC 40The Principal Investigator is Ralph Dubayah at the University of Maryland The Deputy Principal Investigator amp Instrument Scientist is J Bryan Blair at NASA s Goddard Space Flight Center Contents 1 Overview 2 Instrument 3 ReferencesOverview editGEDI was competitively selected as a NASA Earth Ventures Instrument EVI mission in 2014 Cost capped at 94 M GEDI is led by the University of Maryland in collaboration with NASA Goddard Space Flight Center 4 Climate change is closely tied to that of the carbon cycle 3 GEDI produces high resolution laser ranging observations of the 3D structure of the forests of Earth which will provide answers to how deforestation has contributed to atmospheric CO2 concentrations how much carbon forests will absorb in the future and how habitat degradation will affect global biodiversity and the water cycle 1 This in turn is also of value for weather forecasting forest management glacier and snowpack monitoring 1 Overall GEDI will help to better understand how the Earth behaves as a living system GEDI s LIDAR system provides precise geolocated elevation data that drastically improve global Digital Elevation Models DEMs Owing to the vast number of data points that GEDI is capable of collecting it will provide a stronger baseline for DEMs and remove more system errors compared to ICESat 5 It launched on 5 December 2018 on board a Falcon 9 and it is part of the SpaceX CRS 16 mission It was mounted on the Japanese Experiment Module Exposed Facility JEM EF Kibo module for a two year mission 1 6 After three month GEDI started collecting data for scientific use on March 25 2019 1 The mission is being led by Professor Ralph Dubayah of the University of Maryland Once reaching the end of its two year mission GEDI will be removed from the JEM EF and loaded into another Dragon Capsule trunk for disposal 7 Instrument editThe GEDI instrument is a geodetic class light detection and ranging Lidar laser system consisting of three lasers that produce eight parallel tracks of observations Each laser fires 242 times per second and illuminates a 25 m spot a footprint on the surface over which 3D structure is measured Each footprint is separated by 60 m along track with an across track distance of about 600 m between each of the eight tracks GEDI is expected to produce about 10 billion cloud free observations during its nominal 24 month mission length 1 2 4 Using an 80 cm telescope attached to the bottom of the instrument GEDI will be able to receive the pulses of light that bounce back from the Earth surface and collect information on the 3D structure of the area in question Upon the optical bench the instrument contains three Beam Dither Units BDU three beam expanders three star trackers and three HOMER lasers 8 The three HOMER lasers built and installed on GEDI were built by D Barry Coyle Furqan L Chiragh and Erich A Frese The GEDI instrumentation is designed to collect data between 51 6 N latitude and 51 6 S latitude Within this area GEDI gathers data from approximately four percent of the earth s surface including both tropical and temperate forests 9 The LIDAR system can only operate effectively over relatively cloud free areas Dense cloud cover blocks the laser pulses and prevents accurate measurements 9 GEDI uses an active across track pointing system in order to help show area that is not normally covered due to the International Space Station s orbit pattern These occur because the ISS is not maintained in a repeating orbit and can get stuck in orbital resonances that essentially repeat orbital tracks and result in large coverage gaps 9 References edit a b c d e f GEDI Ecosystem LIDAR Home site Accessed on 1 December 2018 a b NASA probe will reveal 3D architecture of forests from space Richard Moss New Atlas 14 September 2014 a b NASA has a plan to take the most detailed scans of the world s forests ever Pierre Bienaime Business Insider UK 3 March 2015 a b GEDI Media Resources NASA Goddard Space Flight Center October 9 2018 Topography and Surface Deformation GEDI Retrieved 2020 02 25 Krebs Gunter GEDI Gunter s Space Page Retrieved August 22 2018 Launch GEDI Retrieved 2020 03 06 Instrument Overview GEDI Retrieved 2020 03 06 a b c Dubayah Ralph Blair James Bryan Goetz Scott Fatoyinbo Lola Hansen Matthew Healey Sean Hofton Michelle Hurtt George Kellner James Luthcke Scott Armston John 2020 06 01 The Global Ecosystem Dynamics Investigation High resolution laser ranging of the Earth s forests and topography Science of Remote Sensing 1 100002 Bibcode 2020SciRS 100002D doi 10 1016 j srs 2020 100002 ISSN 2666 0172 Retrieved from https en wikipedia org w index php title Global Ecosystem Dynamics Investigation amp oldid 1167960828, wikipedia, wiki, book, books, library,
