VIPPHEN_NDVI v004

Vegetation Index and Phenology (VIP) Phenology NDVI Yearly Global 0.05 Deg CMG


PI: Kamel Didan

Description

The 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 meter) 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.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionMEaSUREs VIP
DOI10.5067/MEaSUREs/VIP/VIPPHEN_NDVI.004
File Size1.2 GB
Temporal ResolutionYearly
Temporal Extent1981-01-01 to 2014-12-31
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatHDF-EOS
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers26
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers

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 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 32767 0.01
Rate of Senescence Season 1 Rate of Senescence Season 1 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 32767 0.01
Max VI Season 1 Maximum Vegetation Index Season 1 NDVI 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 366 N/A
End of Season 2 End of Season 2 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Length of Season 2 Length of Season 2 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Day of Peak Season 2 Day of Peak Season 2 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Rate of Greening Season 2 Rate of Greening Season 2 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 32767 0.01
Rate of Senescence Season 2 Rate of Senescence Season 2 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 32767 0.01
Max VI Season 2 Maximum Vegetation Index Season 2 NDVI 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 366 N/A
End of Season 3 End of Season 3 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Length of Season 3 Length of Season 3 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Day of Peak Season 3 Day of Peak Season 3 Day 16-bit signed integer -2, -1 N/A 1 to 366 N/A
Rate of Greening Season 3 Rate of Greening Season 3 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 20000 0.01
Rate of Senescence Season 3 Rate of Senescence Season 3 NDVI/Day 16-bit signed integer -15000, -13000 N/A 0 to 20000 0.01
Max VI Season 3 Maximum Vegetation Index Season 3 NDVI 16-bit signed integer -15000, -13000 N/A -10000 to 10000 0.0001
Cumulative VI Cumulative Vegetation Index NDVI 16-bit signed integer -15000, -13000 N/A -10000 to 10000 0.001
Average VI Average Vegetation Index NDVI 16-bit signed integer -15000, -13000 N/A -10000 to 10000 0.0001
Background VI Background Vegetation Index NDVI 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.

Fill Values for VI and VI/Day

Value Description
-1300 Over land
-1500 Over water

Reliability Legend

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

Product Quality

See the Algorithm Theoretical Basis Document (ATBD) and User Guide Section 6.7 for Quality Assurance information.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MEaSUREs/VIP/VIPPHEN_NDVI.004

About the Image

Vegetation Index and Phenology (VIP) Maximum Vegetation Index Season 1 data from the VIPPHEN_NDVI product across the globe, 2013.

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