Produkt MOD13A2 V6.1 zawiera 2 wskaźniki wegetacji: znormalizowany różnicowy wskaźnik wegetacji (NDVI) i ulepszony wskaźnik wegetacji (EVI).
Wskaźnik NDVI jest nazywany wskaźnikiem ciągłości w stosunku do wskaźnika NDVI pochodzącego z danych z radiometru NOAA-AVHRR (National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer). Wskaźnik EVI ma większą czułość w regionach o dużej biomasie.
Algorytm tego produktu wybiera najlepszą dostępną wartość piksela ze wszystkich danych uzyskanych w ciągu 16 dni. Kryteria to niskie chmury, niski kąt widzenia i najwyższa wartość NDVI/EVI.
Produkt MOD13A2 V6.1 zawiera 2 wskaźniki wegetacji: znormalizowany różnicowy wskaźnik wegetacji (NDVI) i ulepszony wskaźnik wegetacji (EVI). NDVI jest nazywany indeksem ciągłości w stosunku do dotychczasowego NDVI pochodzącego z danych z radiometru NOAA-AVHRR. Wskaźnik EVI ma większą czułość…
[null,null,[],[[["\u003cp\u003eThe MOD13A2 V6.1 product provides Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) data at a 1 kilometer resolution globally.\u003c/p\u003e\n"],["\u003cp\u003eData is collected every 16 days and spans from February 18, 2000 to November 16, 2024.\u003c/p\u003e\n"],["\u003cp\u003eThe product includes quality assessment bands for cloud cover and other factors affecting data reliability.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is provided by NASA LP DAAC at the USGS EROS Center and is freely available for use, sale, or redistribution.\u003c/p\u003e\n"],["\u003cp\u003eUsers can access and analyze this dataset through the Google Earth Engine platform.\u003c/p\u003e\n"]]],["The MOD13A2 V6.1 dataset from NASA LP DAAC at the USGS EROS Center offers 16-day global vegetation indices (NDVI and EVI) at 1km resolution from 2000-02-18 to 2025-02-02. Data selection criteria include low clouds, low view angle, and highest NDVI/EVI values. Users can access data using `ee.ImageCollection(\"MODIS/061/MOD13A2\")` in Earth Engine and download it without usage restrictions. The dataset includes bands for surface reflectance and quality indicators.\n"],null,["# MOD13A2.061 Terra Vegetation Indices 16-Day Global 1km\n\nDataset Availability\n: 2000-02-18T00:00:00Z--2025-07-28T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/MODIS/MOD13A2.061)\n\nCadence\n: 16 Days\n\nTags\n:\n [16-day](/earth-engine/datasets/tags/16-day) [evi](/earth-engine/datasets/tags/evi) [global](/earth-engine/datasets/tags/global) [modis](/earth-engine/datasets/tags/modis) [nasa](/earth-engine/datasets/tags/nasa) [ndvi](/earth-engine/datasets/tags/ndvi) [terra](/earth-engine/datasets/tags/terra) [usgs](/earth-engine/datasets/tags/usgs) [vegetation](/earth-engine/datasets/tags/vegetation) [vegetation-indices](/earth-engine/datasets/tags/vegetation-indices) \nmod13a2 \n\n#### Description\n\nThe MOD13A2 V6.1 product provides two Vegetation Indices (VI): the Normalized\nDifference Vegetation Index (NDVI) and the Enhanced Vegetation Index (EVI).\nThe NDVI is referred to as the continuity index to the existing National\nOceanic and Atmospheric Administration-Advanced Very High Resolution\nRadiometer (NOAA-AVHRR) derived NDVI. The EVI has improved sensitivity over\nhigh biomass regions.\n\nThe algorithm for this product chooses the best available\npixel value from all the acquisitions from the 16-day period. The criteria\nused are low clouds, low view angle, and the highest NDVI/EVI value.\n\nDocumentation:\n\n- [User's Guide](https://lpdaac.usgs.gov/documents/103/MOD13_User_Guide_V6.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/MOD13A2)\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 | 16-day NDVI average |\n| `EVI` | | -2000 | 10000 | 0.0001 | meters | None | 16-day 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| `DayOfYear` | Julian Day | 1 | 366 | | meters | None | Day of year 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/MOD13A2.061\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/MOD13A2')\n .filter(ee.Filter.date('2018-01-01', '2018-05-01'));\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_MOD13A2) \n[MOD13A2.061 Terra Vegetation Indices 16-Day Global 1km](/earth-engine/datasets/catalog/MODIS_061_MOD13A2) \nThe MOD13A2 V6.1 product provides two Vegetation Indices (VI): the Normalized Difference Vegetation Index (NDVI) and the Enhanced Vegetation Index (EVI). The NDVI is referred to as the continuity index to the existing National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer (NOAA-AVHRR) derived NDVI. The EVI has improved sensitivity ... \nMODIS/061/MOD13A2, 16-day,evi,global,modis,nasa,ndvi,terra,usgs,vegetation,vegetation-indices \n2000-02-18T00:00:00Z/2025-07-28T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/MODIS/MOD13A2.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD13A2.061)\n- [https://doi.org/10.5067/MODIS/MOD13A2.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD13A2)"]]
