MYD17A2H V6.1 총 일차 생산성 (GPP) 제품은 500m 해상도의 누적 8일 컴포지트입니다. 이 제품은 방사선 사용 효율성 개념을 기반으로 하며, 데이터 모델의 입력으로 사용하여 육상 에너지, 탄소, 물 순환 과정, 식물의 생지화학을 계산할 수 있습니다. 문서: 사용자 …
[null,null,[],[[["\u003cp\u003eThe MYD17A2H V6.1 dataset provides an 8-day composite of Gross Primary Productivity (GPP) at 500m resolution, derived from the MODIS Aqua satellite.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset utilizes the radiation-use efficiency concept to estimate GPP, which can be used to model terrestrial energy, carbon, water cycles, and vegetation biogeochemistry.\u003c/p\u003e\n"],["\u003cp\u003eData is freely available for use, sale, and redistribution, covering the period from 2021-01-01 to 2024-11-24.\u003c/p\u003e\n"],["\u003cp\u003eKey data layers include GPP, Net Photosynthesis (PsnNet), and a quality control layer (Psn_QC).\u003c/p\u003e\n"],["\u003cp\u003eUsers can access and analyze this dataset through Google Earth Engine, a cloud-based platform for geospatial data analysis.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2021-01-01T00:00:00Z--2025-08-21T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MYD17A2H.061)\n\nCadence\n: 8 Days\n\nTags\n:\n [8-day](/earth-engine/datasets/tags/8-day) [aqua](/earth-engine/datasets/tags/aqua) [global](/earth-engine/datasets/tags/global) [gpp](/earth-engine/datasets/tags/gpp) [modis](/earth-engine/datasets/tags/modis) [nasa](/earth-engine/datasets/tags/nasa) [photosynthesis](/earth-engine/datasets/tags/photosynthesis) [plant-productivity](/earth-engine/datasets/tags/plant-productivity) [productivity](/earth-engine/datasets/tags/productivity) [psn](/earth-engine/datasets/tags/psn) [usgs](/earth-engine/datasets/tags/usgs) \nmyd17a2 \n\nDescription \nThe MYD17A2H V6.1 Gross Primary Productivity (GPP) product\nis a cumulative 8-day composite with a 500m resolution. The product\nis based on the radiation-use efficiency concept and can be potentially\nused as inputs to data models to calculate terrestrial energy,\ncarbon, water cycle processes, and biogeochemistry of vegetation.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/972/MOD17_User_Guide_V61.pdf)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/95/MOD17_ATBD.pdf)\n\n- [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MYD17A2H)\n\nBands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|----------|------------|-------|------|--------|------------|----------------------------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `Gpp` | kg\\*C/m\\^2 | 0 | 3000 | 0.0001 | meters | Gross primary production |\n| `PsnNet` | kg\\*C/m\\^2 | -3000 | 3000 | 0.0001 | meters | Net photosynthesis; GPP minus the maintenance respiration (MR) |\n| `Psn_QC` | | | | | meters | Quality control bits |\n| Bitmask for Psn_QC - Bit 0: MODLAND QC bits - 0: Good quality - 1: Other quality - Bit 1: Sensor - 0: Terra - 1: Aqua - Bit 2: Dead detector - 0: Detectors apparently fine for up to 50% of channels 1, 2 - 1: Dead detectors caused \\\u003e50% adjacent detector retrieval - Bits 3-4: Cloud state - 0: Significant clouds NOT present (clear) - 1: Significant clouds WERE present - 2: Mixed cloud present on pixel - 3: Cloud state not defined, assumed clear - Bits 5-7: 5-level confidence quality score - 0: Very best possible - 1: Good, very usable, but not the best - 2: Substandard due to geometry problems - use with caution - 3: Substandard due to other than geometry problems - use with caution - 4: Couldn't retrieve pixel (NOT PRODUCED AT ALL - non-terrestrial biome) - 7: Fill Value ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\nTerms of Use\n\n**Terms of Use**\n\nMODIS data and products acquired through the LP DAAC\nhave no restrictions on subsequent use, sale, or redistribution.\n\nCitations \nCitations:\n\n- Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)\n for information on citing LP DAAC datasets.\n\nDOIs\n\n- \u003chttps://doi.org/10.5067/MODIS/MYD17A2H.061\u003e\n\nExplore with Earth Engine **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\nCode Editor (JavaScript) \n\n```javascript\nvar dataset = ee.ImageCollection('MODIS/061/MYD17A2H')\n .filter(ee.Filter.date('2021-01-01', '2021-05-01'));\nvar gpp = dataset.select('Gpp');\nvar gppVis = {\n min: 0.0,\n max: 600.0,\n palette: ['bbe029', '0a9501', '074b03'],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(gpp, gppVis, 'GPP');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MYD17A2H) \n[MYD17A2H.061: Aqua Gross Primary Productivity 8-Day Global 500m](/earth-engine/datasets/catalog/MODIS_061_MYD17A2H) \nThe MYD17A2H V6.1 Gross Primary Productivity (GPP) product is a cumulative 8-day composite with a 500m resolution. The product is based on the radiation-use efficiency concept and can be potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. Documentation: User's ... \nMODIS/061/MYD17A2H, 8-day,aqua,global,gpp,modis,nasa,photosynthesis,plant-productivity,productivity,psn,usgs \n2021-01-01T00:00:00Z/2025-08-21T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MYD17A2H.061](https://doi.org/https://doi.org/10.5067/MODIS/MYD17A2H.061)\n- [https://doi.org/10.5067/MODIS/MYD17A2H.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MYD17A2H)"]]
