The NASA MEaSUREs Vegetation Index and Phenology (VIP) global datasets were created using surface reflectance data from the Advanced Very High Resolution Radiometer (AVHRR) N07, N09, N11, and N14 datasets (1981 – 1999) and Moderate Resolution Imaging Spectroradiometer (MODIS) surface reflectance data (2000 - 2014). The VIP Vegetation Index (VI) product was developed to provide consistent measurements of the Normalized Difference Vegetation Index (NDVI) and modified Enhanced Vegetation Index (EVI2) spanning more than 30 years of data from multiple sensors. The EVI2 is a backward extension of AVHRR. Vegetation indices such as NDVI and EVI2 are useful for assessing the biophysical properties of the land surface, and are used to characterize vegetation phenology. Phenology tracks the seasonal life cycle of vegetation, and provides information on the biotic response to environmental changes. The VIPPHEN data product is provided globally at 0.05 degree (5600 meters (m)) spatial resolution in geographic (Lat/Lon) grid format. The data are stored in Hierarchical Data Format-Earth Observing System (HDF-EOS) file format. The VIPPHEN phenology product contains 26 Science Datasets (SDS) which include phenological metrics such as the start, peak, and end of season as well as the rate of greening and senescence. The product also provides the maximum, average, and background calculated VIs. The VIPPHEN SDS are based on the daily VIP product series and are calculated using a 3-year moving window average to smooth out noise in the data. A reliability SDS is included to provide context on the quality of the input data.
This V4 release is based on input daily data from AVHRR LTDR v4 (1981-1999) and MODIS C5 (2000-2014) data records and includes the following changes/additions: *Use of the new MODIS-based MOD44W Land water mask product, with many improvements in the wetlands, small lakes, rivers, and riparian classes; *Science changes; *Product files structural changes; *Improved Processing rules; *Additional VI byproducts
Data Identification Fields:
- EARTH SCIENCE
- PLANT PHENOLOGY
Acquisition Information Fields:
Earth Observation SatellitesNOAA-7
Earth Observation SatellitesNOAA-9
Earth Observation SatellitesNOAA-11
Earth Observation SatellitesNOAA-14
Earth Observation SatellitesTERRA
Temporal Information Fields:
Spatial Information Fields:
|Coverage Type||Zone Identifier||Geometry||Granule Representation|
Vegetation Index and Phenology Laboratory, Department of Electrical and Computer Engineering, University of Arizona
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This data center does not have any contact mechanisms listed.http://measures.arizona.edu/
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Land Processes Distributed Active Archive Center
U.S. Geological Survey, Earth Resources Observation and Science (EROS) Center
Sioux Falls, South Dakota 57198
M-F, 8 a.m. to 4 p.m. Central Time
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