MODIS Level 3 Tile h09v07 Yucatan Peninsula May 1, 2007
Data Characteristics
Area: ~10 degrees x 10 degrees lat/long
Dimensions: 1200 x 1200 rows/columns
File Size: ~ 9 MB
Resolution: 1 kilometer
Projection: Sinusoidal
Data Format: HDF-EOS
Science Data Sets (SDS HDF Layers): 12
The MYD13A2 images shown are samples
of the MODIS/Aqua Vegetation Indices 16-Day L3 Global 1km SIN Grid. The NDVI
and EVI have been pseudo-colored to represent the biomass health of the Yucatan
Peninsula using tile h09v07 from May 1 – 16, 2007. 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, starting with day 009 of every year)
Replaced NDVI_QA and EVI_QA with one VI_QA Science Data Set and added a general QA overview band called “Pixel Reliability.”
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 469-nanometers, 645-nanometers, and 858-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 time series historical applications. MODIS also includes a new Enhanced Vegetation Index (EVI) that
minimizes canopy background variations and maintains sensitivity over dense
vegetation conditions. The EVI also
uses the blue band to remove residual atmosphere contamination caused by
smoke and sub-pixel thin cloud clouds. The MODIS NDVI and EVI products are computed from atmospherically
corrected bi-directional surface reflectances that have been masked for
water, clouds, heavy aerosols, and cloud shadows.
Global
MYD13A2 data are provided every 16 days at 1-kilometer spatial resolution as
a gridded level-3 product in the Sinusoidal projection. VI production is phased between Terra and Aqua acquisitions, with Terra beginning on Day 001 and Aqua beginning on Day 008.
Vegetation
indices are used for global monitoring of 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 and processes, including primary
production and land cover conversion.
Version-5 MODIS/Aqua
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