Il s'agit d'une collection d'entités créée à partir des géométries des tables L4A dans LARSE/GEDI/GEDI04_A_002. Chaque caractéristique est une empreinte polygonale d'une table source avec son ID d'élément et ses codes temporels de début et de fin.
La mission GEDI (Global Ecosystem Dynamics Investigation) vise à caractériser la structure et la dynamique des écosystèmes pour permettre une quantification et une compréhension radicalement améliorées du cycle du carbone et de la biodiversité de la Terre. L'instrument GEDI, fixé à la Station spatiale internationale (ISS), collecte des données à l'échelle mondiale entre les latitudes 51,6° N et 51,6° S avec la résolution la plus élevée et l'échantillonnage le plus dense de la structure tridimensionnelle de la Terre. L'instrument GEDI se compose de trois lasers produisant un total de huit transects au sol, qui échantillonnent instantanément huit empreintes d'environ 25 mètres espacées d'environ 60 mètres le long de la trajectoire.
GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1.
Dubayah, R.O., J. Armston, J.R. Kellner, L. Duncanson, S.P. Healey,
P.L. Patterson, S. Hancock, H. Tang, J. Bruening, M.A. Hofton, J.B. Blair,
and S.B. Luthcke. 2022. ORNL DAAC, Oak Ridge, Tennessee, États-Unis.
doi:10.3334/ORNLDAAC/2056
Il s'agit d'une collection de caractéristiques créée à partir des géométries des tables L4A dans LARSE/GEDI/GEDI04_A_002. Chaque entité géographique est une empreinte polygonale d'une table source avec son ID d'actif et ses codes temporels de début et de fin. Pour en savoir plus, veuillez consulter le guide de l'utilisateur. La mission GEDI (Global Ecosystem Dynamics Investigation) vise à caractériser la structure des écosystèmes…
[null,null,[],[[["\u003cp\u003eProvides a feature collection indexing the GEDI L4A Footprint Level Aboveground Biomass Density dataset (Version 2.1).\u003c/p\u003e\n"],["\u003cp\u003eCovers the period from April 18, 2019, to June 9, 2022, and is globally available between 51.6° N and 51.6° S latitudes.\u003c/p\u003e\n"],["\u003cp\u003eEnables analysis of Earth's carbon cycle and biodiversity by characterizing ecosystem structure and dynamics with high-resolution LiDAR data.\u003c/p\u003e\n"],["\u003cp\u003eIncludes polygon footprints of source tables with asset IDs and timestamps, allowing access to the original GEDI L4A data.\u003c/p\u003e\n"],["\u003cp\u003eDataset is publicly available and offered without restrictions on use and distribution.\u003c/p\u003e\n"]]],[],null,["# GEDI L4A table index\n\nDataset Availability\n: 2019-04-18T00:00:00Z--2024-11-28T00:00:00Z\n\nDataset Provider\n:\n\n\n [Indexing: Google and USFS Laboratory for Applications of Remote Sensing in Ecology (LARSE)](https://www.fs.usda.gov/)\n\n\n [NASA GEDI mission, accessed through the USGS LP DAAC](https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1.html)\n\nTags\n:\n[elevation](/earth-engine/datasets/tags/elevation) [forest-biomass](/earth-engine/datasets/tags/forest-biomass) [gedi](/earth-engine/datasets/tags/gedi) [larse](/earth-engine/datasets/tags/larse) [nasa](/earth-engine/datasets/tags/nasa) [table](/earth-engine/datasets/tags/table) [tree-cover](/earth-engine/datasets/tags/tree-cover) [usgs](/earth-engine/datasets/tags/usgs) \n\n#### Description\n\nThis is a feature collection created from the geometries of L4A tables in\n[LARSE/GEDI/GEDI04_A_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002). Each feature is\na polygon footprint of a source table with its asset id and start/end\ntimestamps.\n\nPlease see [User Guide](https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1.html)\nfor more information.\n\nThe Global Ecosystem Dynamics Investigation [GEDI](https://gedi.umd.edu/)\nmission aims to characterize ecosystem structure and dynamics to enable\nradically improved quantification and understanding of the Earth's carbon cycle\nand biodiversity. The GEDI instrument, attached to the International Space\nStation (ISS), collects data globally between 51.6° N and 51.6° S\nlatitudes at the highest resolution and densest sampling of the\n3-dimensional structure of the Earth. The GEDI instrument consists of three\nlasers producing a total of eight beam ground transects, which instantaneously\nsample eight \\~25 m footprints spaced approximately every 60 m along-track.\n\n| Product | Description |\n|--------------------|---------------------------------------------------------------------------------------------------|\n| L2A Vector | [LARSE/GEDI/GEDI02_A_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_A_002) |\n| L2A Monthly raster | [LARSE/GEDI/GEDI02_A_002_MONTHLY](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_A_002_MONTHLY) |\n| L2A table index | [LARSE/GEDI/GEDI02_A_002_INDEX](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_A_002_INDEX) |\n| L2B Vector | [LARSE/GEDI/GEDI02_B_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_B_002) |\n| L2B Monthly raster | [LARSE/GEDI/GEDI02_B_002_MONTHLY](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_B_002_MONTHLY) |\n| L2B table index | [LARSE/GEDI/GEDI02_B_002_INDEX](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_B_002_INDEX) |\n| L4A Biomass Vector | [LARSE/GEDI/GEDI04_A_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002) |\n| L4A Monthly raster | [LARSE/GEDI/GEDI04_A_002_MONTHLY](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002_MONTHLY) |\n| L4A table index | [LARSE/GEDI/GEDI04_A_002_INDEX](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002_INDEX) |\n| L4B Biomass | [LARSE/GEDI/GEDI04_B_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_B_002) |\n\n### Table Schema\n\n**Table Schema**\n\n| Name | Type | Description |\n|------------|--------|--------------------------------------------------|\n| table_id | STRING | GEDI L4A table collection Ids |\n| time_start | STRING | GEDI L4A table start time in the ISO 8601 format |\n| time_end | STRING | GEDI L4A table end time in the ISO 8601 format |\n\n### Terms of Use\n\n**Terms of Use**\n\nThis dataset is in the public domain and is available\nwithout restriction on use and distribution. See [NASA's\nEarth Science Data \\& Information Policy](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-information-policy)\nfor additional information.\n\n### Citations\n\nCitations:\n\n- GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1.\n Dubayah, R.O., J. Armston, J.R. Kellner, L. Duncanson, S.P. Healey,\n P.L. Patterson, S. Hancock, H. Tang, J. Bruening, M.A. Hofton, J.B. Blair,\n and S.B. Luthcke. 2022. ORNL DAAC, Oak Ridge, Tennessee, USA.\n [doi:10.3334/ORNLDAAC/2056](https://doi.org/10.3334/ORNLDAAC/2056)\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar rectangle = ee.Geometry.Rectangle([\n -111.22, 24.06, -6.54, 51.9\n]);\n// Filter index by date and location\nvar filter_index = ee.FeatureCollection(\n 'LARSE/GEDI/GEDI04_A_002_INDEX').filter(\n 'time_start \u003e \"2020-10-10T15:57:18Z\" && time_end \u003c \"2020-10-11T01:20:45Z\"')\n .filterBounds(rectangle);\n\nMap.addLayer(filter_index);\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/LARSE/LARSE_GEDI_GEDI04_A_002_INDEX) \n[GEDI L4A table index](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002_INDEX) \nThis is a feature collection created from the geometries of L4A tables in LARSE/GEDI/GEDI04_A_002. Each feature is a polygon footprint of a source table with its asset id and start/end timestamps. Please see User Guide for more information. The Global Ecosystem Dynamics Investigation GEDI mission aims to characterize ecosystem structure ... \nLARSE/GEDI/GEDI04_A_002_INDEX, elevation,forest-biomass,gedi,larse,nasa,table,tree-cover,usgs \n2019-04-18T00:00:00Z/2024-11-28T00:00:00Z \n-51.6 -180 51.6 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.fs.usda.gov/)\n- [](https://doi.org/https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1.html)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/LARSE_GEDI_GEDI04_A_002_INDEX)"]]
