fTeffSum

Calculation of effective temperatures and temperature summation

• For a specfic vegetation period and phase, the corresponding phenological observations and daily temperatures are coupled.
• A vegetation period of summer crops only considers the year of interest. In contrast, a vegetation period of winter crops starts in the previous year on the DOY of sowing.
• Before the actual temperature summation, plant-specific base temperatures are substracted, negative temperatures are deleted and the remaining temperature values are weighted by a day length factor.

Source

https://github.com/EMRAgit/fPHASE/blob/master/function/fTeffSum.R

Parameters

• TEMP.GRID -> result from function fPhaseStation
• PHASE.STATION -> result from function fLoadTemp

Output

Shape file of phase-specific daily temperatures and temperature sums

• GRID_ID -> raster cell ID related to WEATHER_GRID_EPSG31467.shp
• LON -> Longitude (EPSG 4326)
• LAT -> Latitude (EPSG 4326)
• STATION -> ID of a phenological observation station
• YEAR -> year of observation
• PHASE -> DWD phase ID
• PLANT -> DWD crop type ID
• DATE -> date of a beginning phenological phase
• DOY -> day of the year of a beginning phenological phase
• DOY_start -> starting DOY, from which temperature sums are calculated
• T[1:365] -> daily temperatures [°C x 10] of the year of harvest
• T[-X:-1] -> only for winter crops: daily temperatures [°C x 10] of the year of sowing (-X=DOY-365) beginning with the DOY of sowing
• T_SUMS -> phase- and station-specific temperature sums