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### Add Background Data

This command will offer a selection of available background information. A set of transport and population data is provided for all GREAT-ER catchments (derived from the Digital Charts of the World, DCW). Selecting the DCW, Roads, Rail Roads, City Areas and City Names will be displayed for the whole country to which the catchments belong. The resolution of the DCW data is 1 : 1,000,000.

Furthermore, for most catchments monitoring and similar data (e.g. water quality classes) are available as background data.

You can select several background themes at the same time.