ผลิตภัณฑ์ MOD16A2 ผลิตโดย Numerical Terradynamic Simulation
Group NTSG,
University of Montana (UMT) ร่วมกับ NASA Earth Observing
System ดูรายละเอียดเพิ่มเติมเกี่ยวกับอัลกอริทึมที่ใช้ได้ที่เอกสารพื้นฐานทางทฤษฎีของอัลกอริทึม
Qiaozhen Mu, Maosheng Zhao, Steven W. Running and Numerical Terradynamic
Simulation Group (2014): MODIS Global Terrestrial Evapotranspiration
(ET) Product MOD16A2 Collection 5
[null,null,[],[[["\u003cp\u003eMOD16A2 V105 provides 8-day global terrestrial evapotranspiration data at 1km resolution from 2000-01-01 to 2014-12-27.\u003c/p\u003e\n"],["\u003cp\u003eEvapotranspiration (ET) is the combined evaporation and plant transpiration from the Earth's surface, and this dataset allows for the quantification of changes in climate, land use, and ecosystem disturbances.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes bands for ET, latent heat flux, potential evapotranspiration, potential latent heat flux, and quality control.\u003c/p\u003e\n"],["\u003cp\u003eMOD16A2 V105 is produced by the Numerical Terradynamic Simulation Group (NTSG) at the University of Montana in conjunction with NASA.\u003c/p\u003e\n"],["\u003cp\u003eThe data is freely available for use, sale, and redistribution without restrictions.\u003c/p\u003e\n"]]],[],null,["# MOD16A2: MODIS Global Terrestrial Evapotranspiration 8-Day Global 1km\n\nDataset Availability\n: 2000-01-01T00:00:00Z--2014-12-27T00:00:00Z\n\nDataset Provider\n:\n\n\n [Numerical Terradynamic Simulation Group, The University of Montana](https://www.ntsg.umt.edu/project/modis/mod16.php)\n\nCadence\n: 8 Days\n\nTags\n:\n[8-day](/earth-engine/datasets/tags/8-day) [evapotranspiration](/earth-engine/datasets/tags/evapotranspiration) [global](/earth-engine/datasets/tags/global) [mod16a2](/earth-engine/datasets/tags/mod16a2) [modis](/earth-engine/datasets/tags/modis) [water-vapor](/earth-engine/datasets/tags/water-vapor) \n\n#### Description\n\nThe MOD16A2 V105 product provides information about\n8-day global terrestrial evapotranspiration at 1km pixel resolution.\nEvapotranspiration (ET) is the sum of evaporation and plant transpiration\nfrom the Earth's surface to the atmosphere. With long-term ET\ndata, the effects of changes in climate, land use, and ecosystems\ndisturbances can be quantified.\n\nThe MOD16A2 product is produced by the Numerical Terradynamic Simulation\nGroup [NTSG](https://www.ntsg.umt.edu/),\nUniversity of Montana (UMT) in conjunction with NASA Earth Observing\nSystem. For more details about the algorithm used see the [algorithm\ntheoretical basis document](https://scholarworks.umt.edu/cgi/viewcontent.cgi?article=1267&context=ntsg_pubs).\n\n- The period of coverage is 8 days with the exception of the last period at the end of the year which is either 5 or 6 days. ET/PET units are 0.1mm/5-day for December 27-31 of 2001, 2002, 2003, 2005, 2006, 2007, 2009, 2010, and 0.1mm/6-day for December 26-31 of 2000, 2004, 2008 (leap years).\n\n\\*\\* For some pixels in African\nrainforest, the MODIS albedo data from MCD43B2/MCD43B3 have no\ncloud-free data throughout an entire year. As a result, pixels\nfor that year in all data bands are masked out.\n\n### Bands\n\n\n**Pixel Size**\n\n1000 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|---------|------------|-------|--------|-------|------------|------------------------------------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `ET` | kg/m\\^2 | -5\\* | 453\\* | 0.1 | meters | Evapotranspiration, aggregated for period of coverage. |\n| `LE` | J/m\\^2/day | -20\\* | 1671\\* | 10000 | meters | Latent heat flux, averaged daily over the period of coverage. |\n| `PET` | kg/m\\^2 | -8\\* | 793\\* | 0.1 | meters | Potential evapotranspiration, aggregated for period of coverage. |\n| `PLE` | J/m\\^2/day | -40\\* | 3174\\* | 10000 | meters | Potential Latent Heat Flux, averaged daily over the period ofcoverage. |\n| `ET_QC` | | | | | meters | ET quality control. |\n| Bitmask for ET_QC - Bit 0: MODLAND_QC bits - 0: Good quality (main algorithm with or without saturation) - 1: Other quality (back-up algorithm or fill values) - Bit 1: Sensor - 0: Terra - 1: Aqua - Bit 2: Dead detector - 0: Detectors 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: SCF_QC (five level confidence score) - 0: Main method used, best result possible (no saturation) - 1: Main method used, good and very usable (with saturation) - 2: Main method failed due to bad geometry, empirical algorithm used - 3: Main method failed due to problems other than geometry, empirical algorithm used - 4: Pixel not produced at all, value couldn't be retrieved ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n\\* estimated min or max value\n\n### Image Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|------------------|--------|---------------------------------------------------------------------------------------------------------------------------|\n| days_of_coverage | DOUBLE | Number of days covered by each image since the period of coverage for the last asset of the year can be of varying length |\n\n### Terms of Use\n\n**Terms of Use**\n\nAll NTSG data distributed through this [site](http://files.ntsg.umt.edu/)\nhas no restrictions on subsequent use, sale, or redistribution.\n\n### Citations\n\nCitations:\n\n- Qiaozhen Mu, Maosheng Zhao, Steven W. Running and Numerical Terradynamic\n Simulation Group (2014): MODIS Global Terrestrial Evapotranspiration\n (ET) Product MOD16A2 Collection 5.\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 dataset = ee.ImageCollection('MODIS/NTSG/MOD16A2/105')\n .filter(ee.Filter.date('2014-04-01', '2014-06-01'));\nvar evapotranspiration = dataset.select('ET');\nvar evapotranspirationVis = {\n min: 0,\n max: 300,\n palette:\n ['a50000', 'ff4f1a', 'f1e342', 'c7ef1f', '05fff3', '1707ff', 'd90bff'],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(evapotranspiration, evapotranspirationVis, 'Evapotranspiration');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_NTSG_MOD16A2_105) \n[MOD16A2: MODIS Global Terrestrial Evapotranspiration 8-Day Global 1km](/earth-engine/datasets/catalog/MODIS_NTSG_MOD16A2_105) \nThe MOD16A2 V105 product provides information about 8-day global terrestrial evapotranspiration at 1km pixel resolution. Evapotranspiration (ET) is the sum of evaporation and plant transpiration from the Earth's surface to the atmosphere. With long-term ET data, the effects of changes in climate, land use, and ecosystems disturbances can be quantified. ... \nMODIS/NTSG/MOD16A2/105, 8-day,evapotranspiration,global,mod16a2,modis,water-vapor \n2000-01-01T00:00:00Z/2014-12-27T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.ntsg.umt.edu/project/modis/mod16.php)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_NTSG_MOD16A2_105)"]]
