MODIS Vegetation Indices Monthly L3 Global 0.05Deg (MOD13C2)
The MODIS Vegetation-Index (VI) products will provide consistent spatial and temporal comparisons of global vegetation conditions that will be used to monitor the Earth’s terrestrial photosynthetic vegetation activity in support of change detection and phenologic and biophysical interpretations. Two vegetation-index (VI) products are to be produced globally for land at launch. One is the standard normalized difference vegetation index (NDVI), which is referred to as the “continuity index” to the existing NOAA-AVHRR-derived NDVI. The other is an enhanced vegetation index (EVI) with improved sensitivity in high biomass regions and improved vegetation monitoring through a decoupling of the canopy background signal and a reduction in atmosphere influences. The two VIs complement each other in global vegetation studies and improve upon the extraction of canopy biophysical parameters.
The APDRC provides monthly 0.05° x 0.05° indices.
For information on how to cite LP DAAC data, please see their Data Citations page at https://lpdaac.usgs.gov/about/citing_lp_daac_and_data.
Version 6 (V6)
The snow cover algorithms and data sets are significantly revised in Version 6. Changes include:
Fractional Snow Cover has been replaced by Normalized Difference Snow Index (NDSI) snow cover. Fractional Snow Cover is no longer calculated;
The binary Snow-Covered Area (SCA) map has been discontinued;
Data screens designed to reduce snow detection errors have been revised and several new screens have been added;
Data screen results are provided in a new QA bit flag, including snow detection reversals and detections with increased uncertainty;
Basic pixel-level QA uses new criteria to indicate the overall quality of algorithm result;
Daily snow cover data sets include SDSs with pointers to the swaths used as the observation of the day.
See the MODIS Snow Cover Products User Guide to Collection 6 for additional details.
The sea ice extent and ice surface temperature algorithms and data sets are the same as Version 5. However, revisions and improvements for Version 6 to sea ice algorithm inputs—in particular, the L1B calibrated radiances, land and water mask, and cloud mask—have improved sea ice outputs as follows:
Revised calibration of thermal bands 31 and 32 decreased calculated brightness temperatures by about -0.01 K and improved accuracy for very cold scenes (especially below ~ -30°C);
The Version 6 land/water mask (stored in the MOD03 geolocation
product) increased the accuracy of water body and coastline maps;
Revisions to the cloud mask algorithm have increased the accuracy of cloud detection.
Version 5 (V5)
A conservative cloud mask is used exclusively.
Monthly snow products are available in a Climate Modeling Grid (CMG).
Fractional snow cover was added to MOD10_L2 and MOD10A1.
Sea Ice by Ice Surface Temperature (IST) and combined sea ice fields were removed from all sea ice products.
Browse images are available for all products.
V005 products use HDF compression making the file size much smaller.
For more information regarding the V005 changes, please visit the MODIS Land Collection 5 Changes Web site.
Normalize difference vegetation index (NDVI), Enhanced vegetation index (EVI), Standard deviation of NDVI and EVI
|Zonal||Global by 0.05 deg|
|Meridional||Global by 0.05 deg|
|Temporal||Feb 2000 to Jan 2017 by 1 month(s)|
|Acquired||Nov 25, 2014 (Updated Feb 2017)|
|Supplements||EOS Data Description (PDF)|