Vegetation Index and Phenology (VIP) Maximum Vegetation Index Season 1 data from the VIPPHEN_EVI2 product across the globe, 2013.
View full-size imageThe NASA Making Earth System Data Records for Use in Research Environments (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)/Terra MOD09 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.
Characteristic | Description |
---|---|
Collection | MEaSUREs VIP |
DOI | 10.5067/MEaSUREs/VIP/VIPPHEN_EVI2.004 |
File Size | 1.2 GB |
Temporal Resolution | Yearly |
Temporal Extent | 1981-01-01 to 2014-12-31 |
Spatial Extent | Global |
Coordinate System | Geographic Latitude and Longitude |
Datum | World Geodetic System (WGS84) |
File Format | HDF-EOS |
Geographic Dimensions | Global |
Characteristic | Description |
---|---|
Number of Science Dataset (SDS) Layers | 26 |
Columns/Rows | 7200 x 3600 |
Pixel Size | 5600 m |
SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
---|---|---|---|---|---|---|---|
Start of Season 1 | Start of Season 1 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
End of Season 1 | End of Season 1 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Length of Season 1 | Length of Season 1 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Day of Peak Season 1 | Day of Peak Season 1 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Rate of Greening Season 1 | Rate of Greening Season 1 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Rate of Senescence Season 1 | Rate of Senescence Season 1 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Max VI Season 1 | Maximum Vegetation Index Season 1 | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.0001 |
Start of Season 2 | Start of Season 2 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
End of Season 2 | End of Season 2 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Length of Season 2 | Length of Season 2 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Day of Peak Season 2 | Day of Peak Season 2 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Rate of Greening Season 2 | Rate of Greening Season 2 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Rate of Senescence Season 2 | Rate of Senescence Season 2 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Max VI Season 2 | Maximum Vegetation Index Season 2 | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.0001 |
Start of Season 3 | Start of Season 3 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
End of Season 3 | End of Season 3 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Length of Season 3 | Length of Season 3 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Day of Peak Season 3 | Day of Peak Season 3 | Day | 16-bit signed integer | -2, -1 | N/A | 1 to 1096 | N/A |
Rate of Greening Season 3 | Rate of Greening Season 3 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Rate of Senescence Season 3 | Rate of Senescence Season 3 | EVI2/Day | 16-bit signed integer | -15000, -13000 | N/A | 0 to 32767 | 0.01 |
Max VI Season 3 | Maximum Vegetation Index Season 3 | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.0001 |
Cumulative VI | Cumulative Vegetation Index | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.001 |
Average VI | Average Vegetation Index | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.0001 |
Background VI | Background Vegetation Index | EVI2 | 16-bit signed integer | -15000, -13000 | N/A | -10000 to 10000 | 0.0001 |
Number of Seasons | Number of Seasons | N/A | 16-bit signed integer | -2 | N/A | 0 to 3 | N/A |
Reliability | Reliability | N/A | 8-bit signed integer | -2, -1 | N/A | 0 to 6 | N/A |
HDF internal tags may have incorrect Valid Range.
Value | Description |
---|---|
-1300 | Over land |
-1500 | Over water |
Value | Description |
---|---|
0 | Excellent |
1 | Good |
2 | Acceptable |
3 | Marginal |
4 | Poor |
5 | Unreliable |
6 | Single Season |
-1 | Fill Value/No Data Over Land |
-2 | Fill Value/No Data Over Water |
See the Algorithm Theoretical Basis Document (ATBD) and User Guide Section 6.7 for Quality Assurance information.