The COST Action 725 Establishing a European Phenological Data Platform for Climatological Applications aims to scope these problems. The basic objective is to build a reference data set of selected plant species and phases which have been observed in European countries over a common reference period, using the BBCH code.
The second goal is to assess and harmonise the different observations rules and propose a common reference manual for phenological observations including rules for quality checks. Further on a working group is developing applications methods for analysis of phenological data, especially for this above mentioned reference data set, including mapping, phenological calendars, trend analyses, and relationships between climate data, satellite images and phenological observations.