Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF
Version 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) ürünü, 500 metre (m) piksel
çözünürlüğünde üretilen, yıl sonu boşlukları doldurulmuş 8 günlük birleşik veri kümesidir. MOD16 veri ürünü koleksiyonu için kullanılan algoritma, Penman-Monteith denkleminin mantığına dayanır. Bu denklemde, günlük meteorolojik yeniden analiz verilerinin yanı sıra bitki örtüsü özelliği dinamikleri, albedo ve arazi örtüsü gibi MODIS uzaktan algılama veri ürünlerinin girişleri yer alır.
İki Evapotranspirasyon katmanının (ET ve PET) piksel değerleri, bileşik dönemdeki sekiz günün toplamıdır. İki Latent Heat katmanının (LE ve PLE) piksel değerleri ise bileşik dönemdeki sekiz günün ortalamasıdır. Her yılın son edinme dönemi, yıla bağlı olarak 5 veya 6 günlük birleşik bir dönemdir.
0: İyi kalite (ana algoritma, doygunluklu veya doygunluksuz)
1: Diğer kalite (yedek algoritma veya doldurma değerleri)
Bit 1: Sensör
0: Terra
1: Aqua
Bit 2: Ölü dedektörü
0: Algılayıcılar, 1. ve 2. kanalların% 50'si için uygun görünüyor.
1: Çalışmayan algılayıcılar, %50'den fazla bitişik algılayıcı alımına neden oldu
3-4. bitler: Bulut durumu
0: Belirgin bulutlar YOK (açık)
1: Önemli bulutlar VARDI
2: Pikselde karışık bulut var
3: Bulut durumu tanımlanmamış, açık olduğu varsayılıyor
5-7. bitler: SCF_QC 5 seviyeli güven kalite puanı
0: Kullanılan ana (RT) yöntem, mümkün olan en iyi sonuç (doygunluk yok)
1: Doygunlukla kullanılan ana (RT) yöntem. İyi, çok kullanışlı
2: Ana (RT) yöntemi, kötü geometri nedeniyle başarısız oldu, deneysel algoritma kullanıldı
3: Geometri dışındaki sorunlar nedeniyle ana (RT) yöntemi başarısız oldu, deneysel algoritma kullanıldı
4: Pixel hiç üretilmedi, değer alınamadı (Olası nedenler: hatalı L1B verileri, kullanılamayan MOD09GA verileri)
Kullanım Şartları
Kullanım Şartları
LP DAAC aracılığıyla edinilen MODIS verileri ve ürünleri, sonraki kullanım, satış veya yeniden dağıtım açısından herhangi bir kısıtlamaya tabi değildir.
Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF Sürüm 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) ürünü, 500 metre (m) piksel çözünürlüğünde üretilen, yıl sonu boşlukları doldurulmuş 8 günlük birleşik veri kümesidir. MOD16 veri ürünü koleksiyonu için kullanılan algoritma, Penman-Monteith denkleminin mantığına dayanır ve aşağıdaki girişleri içerir:
[null,null,[],[[["\u003cp\u003eThe MOD16A2GF V6.1 product provides 8-day global evapotranspiration and latent heat flux data at 500m resolution from 2000 to 2023.\u003c/p\u003e\n"],["\u003cp\u003eIt's based on the Penman-Monteith equation, utilizing MODIS and meteorological data to estimate total and potential evapotranspiration/latent heat flux.\u003c/p\u003e\n"],["\u003cp\u003eThe data is gap-filled to provide year-round coverage and includes quality control flags.\u003c/p\u003e\n"],["\u003cp\u003eThis NASA dataset is freely available for use, sale, and redistribution without restrictions via the LP DAAC.\u003c/p\u003e\n"],["\u003cp\u003eUsers can access and analyze the dataset through Google Earth Engine.\u003c/p\u003e\n"]]],["The NASA MODIS MOD16A2GF Version 6.1 dataset provides 8-day composite data of evapotranspiration (ET) and latent heat flux (LE) at a 500-meter resolution, available from 2000-01-01 to 2024-12-26. It uses the Penman-Monteith equation and includes MODIS-sensed data. Data values represent eight-day totals for ET and potential ET, and daily averages for LE and potential LE. Access is through Google Earth Engine with examples available. The data is freely available for any use, sale, or redistribution.\n"],null,["# MOD16A2GF.061: Terra Net Evapotranspiration Gap-Filled 8-Day Global 500m\n\nDataset Availability\n: 2000-01-01T00:00:00Z--2024-12-26T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MOD16A2GF.061)\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) [modis](/earth-engine/datasets/tags/modis) [nasa](/earth-engine/datasets/tags/nasa) [water-vapor](/earth-engine/datasets/tags/water-vapor) \n\n#### Description\n\nThe Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF\nVersion 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) product is a\nyear-end gap-filled 8-day composite dataset produced at 500 meter (m) pixel\nresolution. The algorithm used for the MOD16 data product collection is\nbased on the logic of the Penman-Monteith equation, which includes inputs of\ndaily meteorological reanalysis data along with MODIS remotely sensed data\nproducts such as vegetation property dynamics, albedo, and land cover.\n\nThe pixel values for the two Evapotranspiration layers (ET and PET) are the\nsum of all eight days within the composite period, and the pixel values for\nthe two Latent Heat layers (LE and PLE) are the average of all eight days\nwithin the composite period. The last acquisition period of each year is a\n5 or 6-day composite period, depending on the year.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/931/MOD16_User_Guide_V61.pdf)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/93/MOD16_ATBD.pdf)\n\n- [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MOD16A2GF)\n\n### Bands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|---------|--------------|--------|-------|-------|------------|------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `ET` | kg/m\\^2/8day | -32767 | 32700 | 0.1 | meters | Total evapotranspiration |\n| `LE` | J/m\\^2/day | -32767 | 32700 | 10000 | meters | Average latent heat flux |\n| `PET` | kg/m\\^2/8day | -32767 | 32700 | 0.1 | meters | Total potential evapotranspiration |\n| `PLE` | J/m\\^2/day | -32767 | 32700 | 10000 | meters | Average potential latent heat flux |\n| `ET_QC` | | | | | meters | Evapotranspiration quality control flags |\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 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: SCF_QC 5-level confidence quality score - 0: Main (RT) method used, best result possible (no saturation) - 1: Main (RT) method used with saturation. Good, very usable - 2: Main (RT) method failed due to bad geometry, empirical algorithm used - 3: Main (RT) method failed due to problems other than geometry, empirical algorithm used - 4: Pixel not produced at all, value couldn't be retrieved (possible reasons: bad L1B data, unusable MOD09GA data) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n### Terms 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\n### Citations\n\nCitations:\n\n- Please visit\n [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data)\n for information on citing LP DAAC datasets.\n\n### DOIs\n\n- \u003chttps://doi.org/10.5067/MODIS/MOD16A2GF.061\u003e\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/061/MOD16A2GF')\n .filter(ee.Filter.date('2022-01-01', '2022-05-01'));\nvar evapotranspiration = dataset.select('ET');\nvar evapotranspirationVis = {\n min: 0,\n max: 300,\n palette: [\n 'ffffff', 'fcd163', '99b718', '66a000', '3e8601', '207401', '056201',\n '004c00', '011301'\n ],\n};\nMap.setCenter(0, 0, 2);\nMap.addLayer(evapotranspiration, evapotranspirationVis, 'Evapotranspiration');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MOD16A2GF) \n[MOD16A2GF.061: Terra Net Evapotranspiration Gap-Filled 8-Day Global 500m](/earth-engine/datasets/catalog/MODIS_061_MOD16A2GF) \nThe Terra Moderate Resolution Imaging Spectroradiometer (MODIS) MOD16A2GF Version 6.1 Evapotranspiration/Latent Heat Flux (ET/LE) product is a year-end gap-filled 8-day composite dataset produced at 500 meter (m) pixel resolution. The algorithm used for the MOD16 data product collection is based on the logic of the Penman-Monteith equation, which includes inputs ... \nMODIS/061/MOD16A2GF, 8-day,evapotranspiration,global,modis,nasa,water-vapor \n2000-01-01T00:00:00Z/2024-12-26T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MOD16A2GF.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD16A2GF.061)\n- [https://doi.org/10.5067/MODIS/MOD16A2GF.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD16A2GF)"]]
