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NPP anomaly maps
Nowcasts and forecasts of Net Primary Productivity
(NPP) are generated using the MODIS MOD17 algorithm.
These vegetation production maps are designed
to provide an accurate regular measure of the
growth of the terrestrial vegetation. Production
is determined by first computing a daily net photosynthesis
value which is then composited over a 8 day interval
of observations over a year, to produce a Net
Primary Productivity (NPP) measure. Weekly forecasts
for the continental U.S. will be available soon.
Nowcast images of global NPP anomalies are available
on a monthly basis here
or click below to view.
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View
daily maps of GPP
Using TOPS and the Ecocast architecture, we currently
produce daily 8km nowcasts of Gross Primary Productivity
(GPP) for the conterminous U.S. These nowcasts
are produced using a variety of input datasets
including daily temperature, humidity, rainfall,
and solar radiation. Current efforts are focused
on the production of nowcasts, but forecasts of
GPP should be available by late 2004.
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Phenology models are currently
being implemented, and forecasts and nowcasts
of phenology will be available soon.
The phenology data will depict interannual variability
in phenology, as represented by the dates of onset
and offset of greenness. Onset is a general term
meant to include many types of growth phenomenon
such as budburst, leaf expansion, and grass greenup.
Offset refers to the end of the growing season,
including cessation of growth in conifers, leaf
abscission, and grass brownoff. Summations of
soil temperature, radiation, and precipitation
are used to model onset; photoperiod, drought
stress, and temperature are used to model offset.
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