يتم توفير بيانات مؤشرات الغطاء النباتي من مقياس الطيف التصويري ذي الدقة المتوسطة (MODIS) على القمر الصناعي Aqua (MYD13A3) الإصدار 6.1 شهريًا بدقة مكانية تبلغ كيلومترًا واحدًا (كم) كمنتج من المستوى 3 مقسّم إلى مربعات في الإسقاط الجيبي. عند إنشاء هذا المنتج الشهري، تستوعب الخوارزمية جميع منتجات MYD13A2 التي تتداخل مع الشهر وتستخدم متوسطًا زمنيًا مرجّحًا.
يتم توفير بيانات مؤشرات الغطاء النباتي (MYD13A3) الإصدار 6.1 من مقياس الطيف التصويري ذي الدقة المتوسطة (MODIS) على القمر الصناعي Aqua شهريًا بدقة مكانية تبلغ كيلومترًا واحدًا (كم) كمنتج من المستوى 3 مقسّم إلى مربّعات في الإسقاط الجيبي. عند إنشاء هذا المنتج الشهري، تستوعب الخوارزمية جميع منتجات MYD13A2 التي تتداخل مع الشهر وتستخدم …
[null,null,[],[[["\u003cp\u003eMYD13A3 V6.1 provides monthly vegetation indices (NDVI, EVI) at 1km resolution derived from NASA's Aqua MODIS sensor.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the globe from July 2002 to October 2024 and includes quality indicators and surface reflectance bands.\u003c/p\u003e\n"],["\u003cp\u003eIt's freely available for use, sale, and redistribution with attribution to the LP DAAC.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore and analyze the dataset through Google Earth Engine.\u003c/p\u003e\n"]]],[],null,["# MYD13A3.061 Aqua Vegetation Indices Monthly L3 Global 1 km SIN Grid\n\nDataset Availability\n: 2002-07-01T00:00:00Z--2025-07-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MYD13A3.061)\n\nCadence\n: 1 Month\n\nTags\n:\n[aqua](/earth-engine/datasets/tags/aqua) [evi](/earth-engine/datasets/tags/evi) [global](/earth-engine/datasets/tags/global) [modis](/earth-engine/datasets/tags/modis) [monthly](/earth-engine/datasets/tags/monthly) [nasa](/earth-engine/datasets/tags/nasa) [ndvi](/earth-engine/datasets/tags/ndvi) [usgs](/earth-engine/datasets/tags/usgs) [vegetation](/earth-engine/datasets/tags/vegetation) [vegetation-indices](/earth-engine/datasets/tags/vegetation-indices) \n\n#### Description\n\nThe Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation\nIndices (MYD13A3) Version 6.1 data are provided monthly at 1 kilometer (km)\nspatial resolution as a gridded Level 3 product in the sinusoidal\nprojection. In generating this monthly product, the algorithm ingests all\nthe MYD13A2 products that overlap the month and employs a weighted temporal\naverage.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/621/MOD13_User_Guide_V61.pdf)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/104/MOD13_ATBD.pdf)\n\n- [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/61/MYD13A3)\n\n### Bands\n\n\n**Pixel Size**\n\n1000 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Wavelength | Description |\n|-------------------|-------|--------|-------|--------|------------|-------------|--------------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `NDVI` | | -2000 | 10000 | 0.0001 | meters | None | Monthly NDVI average |\n| `EVI` | | -2000 | 10000 | 0.0001 | meters | None | Monthly EVI average |\n| `DetailedQA` | | | | | meters | None | VI Quality indicators |\n| Bitmask for DetailedQA - Bits 0-1: VI quality (MODLAND QA Bits) - 0: VI produced with good quality - 1: VI produced, but check other QA - 2: Pixel produced, but most probably cloudy - 3: Pixel not produced due to other reasons than clouds - Bits 2-5: VI usefulness - 0: Highest quality - 1: Lower quality - 2: Decreasing quality - 4: Decreasing quality - 8: Decreasing quality - 9: Decreasing quality - 10: Decreasing quality - 12: Lowest quality - 13: Quality so low that it is not useful - 14: L1B data faulty - 15: Not useful for any other reason/not processed - Bits 6-7: Aerosol Quantity - 0: Climatology - 1: Low - 2: Intermediate - 3: High - Bit 8: Adjacent cloud detected - 0: No - 1: Yes - Bit 9: Atmosphere BRDF correction - 0: No - 1: Yes - Bit 10: Mixed Clouds - 0: No - 1: Yes - Bits 11-13: Land/water mask - 0: Shallow ocean - 1: Land (nothing else but land) - 2: Ocean coastlines and lake shorelines - 3: Shallow inland water - 4: Ephemeral water - 5: Deep inland water - 6: Moderate or continental ocean - 7: Deep ocean - Bit 14: Possible snow/ice - 0: No - 1: Yes - Bit 15: Possible shadow - 0: No - 1: Yes ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n| `sur_refl_b01` | | 0 | 10000 | 0.0001 | meters | 620-670nm | Surface reflectance band 1 (red) |\n| `sur_refl_b02` | | 0 | 10000 | 0.0001 | meters | 841-876nm | Surface reflectance band 2 (near-infrared) |\n| `sur_refl_b03` | | 0 | 10000 | 0.0001 | meters | 459-479nm | Surface reflectance band 3 (blue) |\n| `sur_refl_b07` | | 0 | 10000 | 0.0001 | meters | 2105-2155nm | Surface reflectance band 7 (mid-infrared) |\n| `ViewZenith` | deg | 0 | 18000 | 0.01 | meters | None | View zenith angle of VI Pixel |\n| `SolarZenith` | deg | 0 | 18000 | 0.01 | meters | None | Sun zenith angle of VI pixel |\n| `RelativeAzimuth` | deg | -18000 | 18000 | 0.01 | meters | None | Relative azimuth angle of VI pixel |\n| `SummaryQA` | | | | | meters | None | Quality reliability of VI pixel |\n\n**SummaryQA Class Table**\n\n| Value | Color | Description |\n|-------|-------|---------------------------------------------------------|\n| 0 | None | Good Data: use with confidence |\n| 1 | None | Marginal Data: useful, but look at other QA information |\n| 2 | None | Snow/Ice: target covered with snow/ice |\n| 3 | None | Cloudy: target not visible, covered with cloud |\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 [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/MYD13A3.061\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/MYD13A3')\n .filter(ee.Filter.date('2020-01-01', '2023-05-01'));\nvar ndvi = dataset.select('NDVI');\nvar ndviVis = {\n min: 0,\n max: 9000,\n palette: [\n 'ffffff', 'ce7e45', 'df923d', 'f1b555', 'fcd163', '99b718', '74a901',\n '66a000', '529400', '3e8601', '207401', '056201', '004c00', '023b01',\n '012e01', '011d01', '011301'\n ],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(ndvi, ndviVis, 'NDVI');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_061_MYD13A3) \n[MYD13A3.061 Aqua Vegetation Indices Monthly L3 Global 1 km SIN Grid](/earth-engine/datasets/catalog/MODIS_061_MYD13A3) \nThe Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation Indices (MYD13A3) Version 6.1 data are provided monthly at 1 kilometer (km) spatial resolution as a gridded Level 3 product in the sinusoidal projection. In generating this monthly product, the algorithm ingests all the MYD13A2 products that overlap the month and employs ... \nMODIS/061/MYD13A3, aqua,evi,global,modis,monthly,nasa,ndvi,usgs,vegetation,vegetation-indices \n2002-07-01T00:00:00Z/2025-07-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MYD13A3.061](https://doi.org/https://doi.org/10.5067/MODIS/MYD13A3.061)\n- [https://doi.org/10.5067/MODIS/MYD13A3.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MYD13A3)"]]
