Data Characteristics
Area: Global
Dimensions: 3600 x 7200
rows/columns
File Size: ~35.5 MB
Resolution: 0.05 degree
(5600-meter)
Projection: Lat/Lon
Data Format: HDF-EOS
Science Data Sets (SDS HDF Layers): 13
The image above is a global 16-day composite
of the MODIS Enhanced Vegetation Index (EVI) included in the MOD13C1
product. The EVI values have been
pseudo-colored to represent biomass health across the globe using data
acquired between April 6- 21, 2000. Due to their simplicity, ease of
application, and widespread familiarity, vegetation indices have a wide range
of usage within the user community. Some of the more common applications may
include global biogeochemical and hydrologic modeling, agricultural
monitoring and forecasting, land-use planning, land cover characterization,
and land cover change detection.
V005 Change Points of Interest:
Phased production for improved temporal frequency (produced every 8 days using the last 16-days of acquisitions)
Replaced NDVI_QA and EVI_QA with one VI_QA Science Data Set
Reduced file volume by using internal compression
Product Description
Global MODIS vegetation
indices are designed to provide consistent spatial and temporal comparisons
of vegetation conditions. Blue, red, and near-infrared reflectances, centered
at 470-nanometers, 648-nanometers, and 848-nanometers, respectively, are used
to determine the MODIS daily vegetation indices.
The MODIS Normalized
Difference Vegetation Index (NDVI) complements NOAA's Advanced Very High
Resolution Radiometer (AVHRR) NDVI products and provides continuity for
historical applications. The MODIS NDVI product contains atmospherically
corrected bi-directional surface reflectances masked for water, clouds, and
cloud shadows. Another MODIS index, the Enhanced Vegetation Index or EVI,
uses the blue band to remove residual atmospheric contamination caused by
smoke and sub-pixel thin clouds. The EVI also uses feedback adjustment to
minimize canopy background variations and to enhance vegetation sensitivity
from sparse to dense vegetation conditions.
Global MOD13C1 data are cloud-free
spatial composites of the gridded 16-day 1-kilometer MOD13A2, and are
provided as a level-3 product projected on a 0.05 degree (5600-meter)
geographic Climate Modeling Grid (CMG). Cloud-free global coverage is achieved by replacing clouds with the
historical MODIS time series climatology record.
Vegetation indices are
used for globally monitoring vegetation conditions and are used in products
displaying land cover and land cover changes. These data may be used as input
for modeling global biogeochemical and hydrologic processes and global and
regional climate. These data also may be used for characterizing land surface
biophysical properties, including land cover.
Version-5
MODIS/Terra Vegetation Indices products are Validated Stage 2, meaning that
accuracy has been assessed over a widely distributed set of locations and
time periods via several ground-truth and validation efforts.� Although there may be later improved
versions, these data are ready for use in scientific publications.
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science Center (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001