Data portal

The Data Portal is a web-based information system that gives access to GEMStat water quality data and allows to generate statistical and graphical visualisations of the data. The data can be visualised for single sampling sites, or aggregated at country or catchment level.

Map and table view Available stations can be shown in map or table view. By default, the system displays the available stations in map view. The view can be changed via the respective buttons in the upper menu bar.

Spatial aggregation Available data can be displayed as single sampling sites, or aggregated at country or catchment level. The aggregation can be switched via the respective buttons in the upper menu bar.

Map view navigation The zoom function can be easily controlled via the scroll wheel of the mouse or the zoom/pan button. Several stations can be simultaneously selected with the rectangle or the polygon tool. The latter allows a more precise selection.

By clicking the legend button, different overlays can be selected (catchments, countries, stations). In addition, you can choose between different base layers and hide the legend.

Filter function The filter bar on the left allows to filter the available stations using different filter conditions (e.g. parameters, station types, date range). The filter can be reset via the “clear filter” button.