fPhaseStation

Coupling of year- and phase-specific observations and corresponding phenological stations

• A shape file of all available phenological stations is related to year- and phase-specific observations (output from function fImportPhenObs).
• During the coupling operation, the actual observed phase-specific days of the year (DOY) and the corresponding starting DOYs are determined.
• There are two options to determin starting DOYs (column "DOY_start"):
  • Summer crops -> DOY_start = 1
  • Winter crops -> for spring and summer phases of the current year -> DOY_start corresponds to the starting DOY of phase 10 observed in previous year

Source

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

Parameters

• PHENO.OBS -> Phenological observations resulting from function "fImportPhenObs()"
• IN.DIR -> directory with phenological stations' file
• PHENO.STATIONS -> ESRI shape file of all phenological stations
• PHASE -> DWD phase ID
• PLANT -> DWD crop type ID
• YEAR -> year of observation
• start.Phase=10 -> determining the starting phase
• start.Day=1 -> determining the starting DOY
• OL.RM -> removal of observation outliers using the interquartile range (IQR) criterion is TRUE or FALSE (default = TRUE)

Output

Spatial point object containing year and phase-specific phenological observations:

• STATION -> ID of a phenological observation station
• ID -> object ID
• X -> X coordinate (EPSG 31467)
• Y -> Y coordniate (EPSG 31467)
• GRID_ID -> IDs of grid cell polygone shape file
• QL -> DWD quality level
• YEAR -> year of observation
• PLANT -> DWD plant code
• PHASE -> DWD phase code
• DATE -> date of a beginning phenological phase
• QF -> quality flag
• DOY -> day of the year of a beginning phenological phase
• DOY_start -> starting DOY, from which temperature sums are calculated