Global Earth Observation and Monitoring
of the atmosphere


Terrain below site

Description:Percentage of terrain within 50 km radius from the site that lies at lower altitudes than the site itself based on GLOBE 30'' (arc-seconds) topography data. For an elevated site this percentage will be large (close to 100 %), while for sites within valleys or basins this percentage will be small. For sites within homogeneous terrain the percentage will be 50 %. Such sites can be assumed to be more representative for a larger area, while for sites in more complex terrain thermally-induced flow systems might influence the surface concentration field and introduce large heterogeneities.

Please contact Stephan Henne in case of any questions.