MOD13Q1 V6.1 प्रॉडक्ट, हर पिक्सल के आधार पर वेजिटेशन इंडेक्स (वीआई) की वैल्यू देता है. इसमें वनस्पति की दो मुख्य परतें होती हैं.
पहला इंडेक्स, नॉर्मलाइज़्ड डिफ़रेंस वेजिटेशन इंडेक्स (एनडीवीआई) है. इसे मौजूदा नैशनल ओशनिक ऐंड ऐटमॉस्फ़ेरिक ऐडमिनिस्ट्रेशन-ऐडवांस वेरी हाई रिज़ॉल्यूशन रेडियोमीटर (एनओएए-एवीएचआरआर) से मिले एनडीवीआई के लिए, कंटिन्यूटी इंडेक्स कहा जाता है. वनस्पति की दूसरी लेयर, बेहतर वनस्पति सूचकांक (ईवीआई) है. यह कैनोपी के बैकग्राउंड में होने वाले बदलावों को कम करता है. साथ ही, घनी वनस्पति की स्थितियों में संवेदनशीलता बनाए रखता है.
ईवीआई, नीले बैंड का इस्तेमाल करके धुएं और सब-पिक्सेल वाले पतले बादलों की वजह से, वायुमंडल में मौजूद प्रदूषण को भी हटाता है. MODIS NDVI और EVI प्रॉडक्ट, वायुमंडल के हिसाब से सही किए गए दो दिशाओं वाले सर्फ़ेस रिफ़्लेक्टेंस से कैलकुलेट किए जाते हैं. इन्हें पानी, बादलों, भारी ऐरोसॉल, और बादलों की परछाइयों के लिए मास्क किया गया है.
MOD13Q1 V6.1 प्रॉडक्ट, हर पिक्सल के आधार पर वेजिटेशन इंडेक्स (वीआई) वैल्यू देता है. इसमें वनस्पति की दो मुख्य परतें होती हैं. पहला इंडेक्स, नॉर्मलाइज़्ड डिफ़रेंस वेजिटेशन इंडेक्स (एनडीवीआई) है. इसे नैशनल ओशिऐनिक ऐंड एट्मॉस्फ़ियरिक एडमिनिस्ट्रेशन-ऐडवांस वेरी हाई रिज़ॉल्यूशन रेडियोमीटर …
[null,null,[],[[["\u003cp\u003eThe MOD13Q1 V6.1 product provides Vegetation Index (VI) values, including NDVI and EVI, at a 250m resolution.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset offers global coverage and is derived from atmospherically corrected surface reflectances.\u003c/p\u003e\n"],["\u003cp\u003eIt includes quality indicators, surface reflectance bands, and observation geometry information.\u003c/p\u003e\n"],["\u003cp\u003eThe data is freely available for use, sale, and redistribution through the LP DAAC.\u003c/p\u003e\n"],["\u003cp\u003eMOD13Q1 data is accessible through Google Earth Engine for analysis and visualization.\u003c/p\u003e\n"]]],["The MOD13Q1 V6.1 dataset, provided by NASA LP DAAC at the USGS EROS Center, offers 16-day global vegetation data from 2000-02-18 to 2025-02-02. Key components include the Normalized Difference Vegetation Index (NDVI) and the Enhanced Vegetation Index (EVI), calculated at 250-meter pixel resolution. The data, accessible via Earth Engine with the code snippet `ee.ImageCollection(\"MODIS/061/MOD13Q1\")`, is atmospherically corrected and masked for water, clouds, and aerosols. The data has no restrictions on its use, sale or distribution.\n"],null,["# MOD13Q1.061 Terra Vegetation Indices 16-Day Global 250m\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/MOD13Q1.061)\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) \nmod13q1 \n\n#### Description\n\nThe MOD13Q1 V6.1 product provides a Vegetation Index (VI)\nvalue at a per pixel basis. There are two primary vegetation layers.\nThe first is the Normalized Difference Vegetation Index (NDVI)\nwhich 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 second vegetation layer\nis the Enhanced Vegetation Index (EVI) that minimizes canopy background\nvariations and maintains sensitivity over dense vegetation conditions.\nThe EVI also uses the blue band to remove residual atmosphere contamination\ncaused by smoke and sub-pixel thin cloud clouds. The MODIS NDVI\nand EVI products are computed from atmospherically corrected bi-directional\nsurface reflectances that have been masked for water, clouds, heavy\naerosols, and cloud shadows.\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\n250 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Wavelength | Description |\n|-------------------|-------|--------|-------|--------|------------|----------------------|----------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `NDVI` | | -2000 | 10000 | 0.0001 | meters | None | Normalized Difference Vegetation Index |\n| `EVI` | | -2000 | 10000 | 0.0001 | meters | None | Enhanced Vegetation Index |\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 | 645nm | Red surface reflectance |\n| `sur_refl_b02` | | 0 | 10000 | 0.0001 | meters | 858nm | NIR surface reflectance |\n| `sur_refl_b03` | | 0 | 10000 | 0.0001 | meters | 469nm | Blue surface reflectance |\n| `sur_refl_b07` | | 0 | 10000 | 0.0001 | meters | 2130nm/2105 - 2155nm | MIR surface reflectance |\n| `ViewZenith` | deg | 0 | 18000 | 0.01 | meters | None | View zenith angle |\n| `SolarZenith` | deg | 0 | 18000 | 0.01 | meters | None | Solar zenith angle |\n| `RelativeAzimuth` | deg | -18000 | 18000 | 0.01 | meters | None | Relative azimuth angle |\n| `DayOfYear` | | 1 | 366 | | meters | None | Julian day of year |\n| `SummaryQA` | | | | | meters | None | Quality reliability of VI pixel |\n| Bitmask for SummaryQA - Bits 0-1: VI quality (MODLAND QA Bits) - 0: Good data, use with confidence - 1: Marginal data, useful but look at detailed QA for more information - 2: Pixel covered with snow/ice - 3: Pixel is cloudy ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\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/MOD13Q1.061\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/MOD13Q1')\n .filter(ee.Filter.date('2018-01-01', '2018-05-01'));\nvar ndvi = dataset.select('NDVI');\nvar ndviVis = {\n min: 0,\n max: 8000,\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_MOD13Q1) \n[MOD13Q1.061 Terra Vegetation Indices 16-Day Global 250m](/earth-engine/datasets/catalog/MODIS_061_MOD13Q1) \nThe MOD13Q1 V6.1 product provides a Vegetation Index (VI) value at a per pixel basis. There are two primary vegetation layers. The first is the Normalized Difference Vegetation Index (NDVI) which is referred to as the continuity index to the existing National Oceanic and Atmospheric Administration-Advanced Very High Resolution Radiometer ... \nMODIS/061/MOD13Q1, 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/MOD13Q1.061](https://doi.org/https://doi.org/10.5067/MODIS/MOD13Q1.061)\n- [https://doi.org/10.5067/MODIS/MOD13Q1.061](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_061_MOD13Q1)"]]
