글로벌 생태계 역학 조사GEDI 미션은 생태계 구조와 역학을 특징지어 지구의 탄소 순환과 생물 다양성을 획기적으로 개선된 방식으로 정량화하고 이해하는 것을 목표로 합니다. 국제우주정거장 (ISS)에 부착된 GEDI 장비는 지구의 3차원 구조를 최고 해상도와 가장 밀도 높은 샘플링으로 위도 51.6°N과 51.6°S 사이에서 전 세계 데이터를 수집합니다. GEDI 장비는 총 8개의 빔 지상 트랜섹트를 생성하는 3개의 레이저로 구성되어 있으며, 이는 트랙을 따라 약 60m 간격으로 배치된 8개의 ~25m 풋프린트를 즉시 샘플링합니다.
GEDI L4A 지상 바이오매스 밀도 발자국 수준, 버전 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. 2022년. ORNL DAAC, Oak Ridge, Tennessee, USA.
doi:10.3334/ORNLDAAC/2056
LARSE/GEDI/GEDI04_A_002의 L4A 테이블 도형에서 생성된 특징 컬렉션입니다. 각 특징은 애셋 ID와 시작/종료 타임스탬프가 있는 소스 테이블의 다각형 발자국입니다. 자세한 내용은 사용자 가이드를 참고하세요. 글로벌 생태계 역학 조사(GEDI) 임무는 생태계 구조를 특징짓는 것을 목표로 합니다.
[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)"]]
