Reads phenological data out of a tsv-table containing the columns
‘DWD_STAT_ID’ (the ID of the phenological station),
‘STAT_NAME’ (the name of the phenological station),
‘STAT_LON’ (the longitude of the station),
‘STAT_LAT’ (the latitude of the station),
‘STAT_ALT’ (the altitude of the station),
‘BEGIN_OBS’ (the year the station started the observation),
‘END_OBS’ (the year the station stopped the observation),
‘NATURRAUM_ID’ (the id of the region),
‘PHASE_ID’ (the ID of the observed phase),
‘OBS_DAY’ (the julian day the observed phase starts),
‘OBS_YEAR’ (the year at which ‘OBS_DAY’ was observed),
‘CHECKED’ (a value determining wether the result was checked or not),
‘outlier’ (if result was checked, this value determines wether it was an outlier or not).
Such a dataset can be obtained at http://www.phenology.de.