Open Street Map B&W - Provided by Terrestris

OpenStreetMap WMS, provided by terrestris GmbH und Co. KG. Accelerated with MapProxy (http://mapproxy.org/) Credits (c) OpenStreetMap contributors (http://www.openstreetmap.org/copyright) (c) OpenStreetMap Data (http://openstreetmapdata.com) (c) Natural Earth Data (http://www.naturalearthdata.com) (c) ASTER GDEM 30m (https://asterweb.jpl.nasa.gov/gdem.asp) (c) SRTM 450m by ViewfinderPanoramas (http://viewfinderpanoramas.org/) (c) Great Lakes Bathymetry by NGDC (http://www.ngdc.noaa.gov/mgg/greatlakes/) (c) SRTM 30m by NASA EOSDIS Land Processes Distributed Active Archive Center (LP DAAC, https://lpdaac.usgs.gov/)