This layer shows a grid of the UTM system (Universe Transverse Mercator)

This layer shows the borders of Luxembourg's jurisdictions

This layer contains the official orthophotos covering the national territory of Luxemburg, and that have been produced following a surveying flight in summer 2016 under the responsibility of the administration du cadastre et de la topographie.

This layer shows the borders of Luxembourg's electoral districts

The macroinvertebrates are sampled according to the French method IBGN ( indice biologique global normalisé , agences de l' eau 2000). The results allow to classify the surface water bodies into 5 classes : high - good - moderate - poor - bad. Macroinvertebrates are sensitive to the hydromorphology, organic pollution , biological continuity , water regime and acidification. The Macroinvertebrates are one out of four biological parameters of the ecological status of surface water.