The satellite- derived phenology is computed on the long-term average of 10-day MODIS NDVI data produced by BOKU University starting from MOD13A2 and MYD13A2 V006 16-DAY Global data at 1 km resolution. Phenology was extracted using the SPIRITS software applied to the historical average of the smoothed NDVI over the period 2003-2016. For each pixel, start of the season is retrieved, occuring at the time at which NDVI grows above the 25% the ascending amplitude of the seasonal profile.
Meroni, Michele (2026): Global land surface phenology - Start of the season. European Commission, Joint Research Centre [Dataset] doi: 10.2905/JRC.9G7G6Q0 PID: http://data.europa.eu/89h/jrc-10112-10010
Agricultural monitoringASAPland surface phenologySOSstart of season
Tiff file containg value V which is expressed over a 3 years period, from 1 to 108 dekads (i.e. ten day periods). This is done to be able to treat the circular variable dekad as an ordinal variable. To get the timing T in the 1-36 dekad units (calendar year): i)if value V is smaller or eaual with 36, then T=V, ii) if value V is larger than 36 and smaller or equal with 72, then T= V-36,and iii)if value V is larger than 72, then T=V-72.
Tiff file containg value V which is expressed over a 3 years period, from 1 to 108 dekads (i.e. ten day periods). This is done to be able to treat the circular variable dekad as an ordinal variable. To get the timing T in the 1-36 dekad units (calendar year): i)if value V is smaller or eaual with 36, then T=V, ii) if value V is larger than 36 and smaller or equal with 72, then T= V-36,and iii)if value V is larger than 72, then T=V-72.
