Il s'agit d'une collection de caractéristiques créée à partir des géométries des tables L2A dans LARSE/GEDI/GEDI02_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.
Empreinte mondiale des données de métriques d'altitude et de hauteur GEDI L2A – GEDI02_A
Dubayah, R., M. Hofton, J. Blair, J. Armston, H. Tang, S. Luthcke. GEDI L2A
Elevation and Height Metrics Data Global Footprint Level V002. 2021, distribué par NASA EOSDIS Land Processes DAAC. Consulté le AAAA-MM-JJ.
Il s'agit d'une collection de caractéristiques créée à partir des géométries des tables L2A dans LARSE/GEDI/GEDI02_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\u003eThis dataset provides a feature collection indexing the GEDI L2A data tables, covering the period from March 25, 2019, to January 1, 2023.\u003c/p\u003e\n"],["\u003cp\u003eEach feature represents the footprint of a GEDI L2A data table and includes its asset ID and temporal information.\u003c/p\u003e\n"],["\u003cp\u003eGEDI data, collected by the International Space Station, characterizes Earth's ecosystem structure and dynamics, focusing on the carbon cycle and biodiversity.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is publicly available and can be accessed through Google Earth Engine.\u003c/p\u003e\n"],["\u003cp\u003eThe GEDI instrument utilizes three lasers to sample eight ground transects, providing high-resolution 3D structural data of the Earth.\u003c/p\u003e\n"]]],[],null,["# GEDI L2A table index\n\nDataset Availability\n: 2019-03-25T00:00:00Z--2024-11-29T00:00:00Z\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://lpdaac.usgs.gov/products/gedi02_av002/)\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 L2A tables in\n[LARSE/GEDI/GEDI02_A_002](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_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://lpdaac.usgs.gov/documents/986/GEDI02_UserGuide_V2.pdf)\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 L2A table collection Ids |\n| time_start | STRING | GEDI L2A table start time in the ISO 8601 format |\n| time_end | STRING | GEDI L2A 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 L2A Elevation and Height Metrics Data Global Footprint Level - GEDI02_A\n Dubayah, R., M. Hofton, J. Blair, J. Armston, H. Tang, S. Luthcke. GEDI L2A\n Elevation and Height Metrics Data Global Footprint Level V002. 2021,\n distributed by NASA EOSDIS Land Processes DAAC. Accessed YYYY-MM-DD.\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/GEDI02_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_GEDI02_A_002_INDEX) \n[GEDI L2A table index](/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_A_002_INDEX) \nThis is a feature collection created from the geometries of L2A tables in LARSE/GEDI/GEDI02_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/GEDI02_A_002_INDEX, elevation,forest-biomass,gedi,larse,nasa,table,tree-cover,usgs \n2019-03-25T00:00:00Z/2024-11-29T00:00:00Z \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://lpdaac.usgs.gov/products/gedi02_av002/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/LARSE_GEDI_GEDI02_A_002_INDEX)"]]
