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Add a Custom Background Map to HydroDesktop

Jun 28, 2013 at 1:46 PM
I found the following undocumented feature in HydroDesktop quite interesting:

Adding the Finland "Peruskartta" topographic map layer
In the "Online Basemap" dropdown choose "Other"
Enter the url:{zoom}/{x}/{y}.jpg
map shows correctly.

Adding the U.S Geological Survey (USGS) topo maps:
In the "Online Basemap" dropdown choose "Other"
Enter the url:{zoom}/{y}/{x}

This works for many other (not all) base map layers that are available on the Internet and that use the "Google" or "TMS" pseudo-mercator projection tile scheme. The Url needs to contain the {zoom} {x} and {y} placeholders. This way almost any base map layer from the ArcGIS Online ( pages can be added to HydroDesktop. I tested this method with HydroDesktop 1.6.6 experimental version.