MODIS/Terra Vegetation Indices 16-Day L3 Global 250m SIN Grid V061

Description

The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) Vegetation Indices (MOD13Q1) Version 6.1 data are generated every 16 days at 250 meter (m) spatial resolution as a Level 3 product. The MOD13Q1 product provides 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 (NOAA-AVHRR) derived NDVI. The second vegetation layer is the Enhanced Vegetation Index (EVI), which has improved sensitivity over high biomass regions. The algorithm chooses the best available pixel value from all the acquisitions from the 16 day period. The criteria used is low clouds, low view angle, and the highest NDVI/EVI value. Along with the vegetation layers and the two quality layers, the HDF file will have MODIS reflectance bands 1 (red), 2 (near-infrared), 3 (blue), and 7 (mid-infrared), as well as four observation layers. Validation at stage 3 (https://landweb.modaps.eosdis.nasa.gov/cgi-bin/QA_WWW/newPage.cgi?fileName=maturity) has been achieved for all MOD13 vegetation products. Further details regarding product validation for the MOD13Q1 data product is available from the MODIS land team validation site (https://landval.gsfc.nasa.gov/ProductStatus.php?ProductID=MOD13). Improvements/Changes from Previous Versions * The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the period 2012 - 2017. * A polarization correction has been applied to the L1B Reflective Solar Bands (RSB).

Resources

Name Format Description Link
21 The Application for Extracting and Exploring Analysis Ready Samples (AρρEEARS) offers a simple and efficient way to perform data access and transformation processes. https://appeears.earthdatacloud.nasa.gov/
20 LP DAAC Data Pool provides direct access to available products via HTTPS. https://e4ftl01.cr.usgs.gov/MOLT/MOD13Q1.061/
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FMODIS%2FMOD13Q1.061
21 Access data via Open-source Project for a Network Data Access Protocol. https://opendap.cr.usgs.gov/opendap/hyrax/MOD13Q1.061/contents.html
21 The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products. https://lpdaac.usgs.gov/
33 The Algorithm Theoretical Basis Document (ATBD) describes the physical and mathematical algorithms for the product. https://lpdaac.usgs.gov/documents/104/MOD13_ATBD.pdf
21 The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc. https://doi.org/10.5067/MODIS/MOD13Q1.061
20 Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data. https://search.earthdata.nasa.gov/search/granules?p=C1748066515-LPCLOUD
33 The technical information in the User's Guide enables users to interpret and use the data products. https://lpdaac.usgs.gov/documents/621/MOD13_User_Guide_V61.pdf
21 Further details regarding MODIS land product validation for the MOD13 data products are available from the MODIS Land Team Validation site. https://modis-land.gsfc.nasa.gov/ValStatus.php?ProductID=MOD13Q1
21 The File Specification provides a description of the product file including Scientific Data Sets and their attributes. https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/61/MOD13Q1
21 Validation at stage 3 has been achieved for the MODIS Vegetation Index product suite. https://modis-land.gsfc.nasa.gov/MODLAND_val.html
21 Quality Assessment provides information regarding the usability and usefulness of the data product. https://landweb.modaps.eosdis.nasa.gov/cgi-bin/QA_WWW/qaFlagPage.cgi?sat=terra&ver=C6
21 Browse image for Earthdata Search. https://cmr.earthdata.nasa.gov/browse-scaler/browse_images/granules/G2346280125-LPCLOUD?h=500&w=500

Tags

  • biosphere
  • national-geospatial-data-asset
  • ngda
  • vegetation
  • earth-science

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