Phenology dataset
Description
The mean growing season period is defined by a satellite-derived phenology computed on the long-term average of 10-day MODIS NDVI data. The MODIS data preprocessing was done by BOKU University (Klisch and Atzberger, 2016) starting from MOD13A2 and MYD13A2 V006 16-day Global data at 1 km resolution. Phenology was extracted using the SPIRITS software (Eerens et al., 2014; Rembold et al., 2015) applied to the historical average of the smoothed NDVI over the period 2003-2016.
The following key parameters are retrieved for each pixel: number of growing seasons per year (i.e. one or two); start of season (SOS, occurring at the time at which NDVI reaches 25% of the ascending amplitude of the seasonal profile); time of maximum NDVI (TOM); start of senescence period (SEN, when NDVI drops below 75% of the descending amplitude); and end of the season (EOS, when NDVI drops below 35%).
Phenology timings: the value V in the image is expressed over a 3 years period, from dekads (i.e. ten-day periods) 1 to 108. This is done in order to treat the circular variable "dekad" as an ordinal variable (the mean of SOS cam be computed as the usual average).
Example for a season crossing the calendar year:
phenos1 = 30, last dekad of October, phenoe1 = 46, first dekad of April -> T = 46 - 36 = 10
Therefore, to get the timing T in the 1-36 dekad units (calendar year), one can use:
IF V <= 36 THEN T = V
IF 36 < V <= 72 THEN T = V -36
IF V > 72 THEN T = V - 72
To access the data, please, use the following links:
phenos1_v03.tif
Phenology: start of the season, first season
phenos2_v03.tif
Phenology: start of the season, second season
phenom1_v03.tif
Phenology: max of the season, first season
phenom2_v03.tif
Phenology: max of the season, second season
phenoe1_v03.tif
Phenology: end of the season, first season
phenoe2_v03.tif
Phenology: end of the season, second season
phenosen1_v03.tif
Phenology: start of senescence, first season
phenosen2_v03.tif
Phenology: start of senescence, second season
phenonseasons_v03.tif
Phenology: number of seasons (1 or 2)