Survey: Hydrological information needs and limitations for habitat RS-monitoring

Annex for Biodiversa+ Habitat Pilot subtask report: Habitat condition indicators for monitoring. (2025) The file contains a spreadsheet of habitat monitoring survey results. In the survey, we mapped information needs and expected limitations for remote sensing (RS) -based monitoring of grassland and wetland habitats hydrological condition. The survey was answered by six pilot partners for their respective regions in the EU. The spreadsheet contains the following sections filled by each partner for each of the habitat types occurring in their region: Habitat Directive Annex 1 Habitat type Relevant season(s) for monitoring Required time window for observations to capture ecologically relevant hydrological events in the habitat (quick- versus longer term flooding, prolonged drought periods) Expected limitations for satellite-based monitoring (tree-cover, thick vegetation layer, high-resolution heterogeneity, small size of habitats) Relevancy of the suggested yearly RS-indicator metrics including the following: Moisture indices: Yearly mean, mean of specific season, wetness minimum, wetness maximum Inundation Number of inundated months or weeks Seasonally/constantly inundated area Ending time of flooding season Drought frequency over multiple years