Bergen Hill once stood tall in Brooklyn, before developers had it carted away for fill to make the Atlantic Docks of Red Hook.  Looking at historic maps from 1775, 1837 and 2004 cartographer Eymund Diegel determined that the hill, which was in the...

This map contains community group research (Gowanus Canal Conservancy / Public Lab) on finding stream restoration opportunities in the Gowanus Watershed. It uses hydrological surface flow modeling by Eymund Diegel. This map looks at alternative...

Bernard Ratzer was a military surveyor who mapped the Gowanus marshes and farms in 1766. The map was calibrated to 2004 New York City digital base map data by Eymund Diegel, urban planner, using surviving common remnant street intersections (Red...

2013 Sandy Flood saline impacted tree survey by Eymund Diegel for the NYC Parks Department Text on map: "Gowanus / Red Hook Flood Impacts:  Post Sandy Flood Tree Leaf Out Percentages. Trees impacted by salt water ponding and salt water...

Sandy essentially flooded anyone who built on the former tidal marshes.  Map Explanation by mapmaker Eymund Diegel: Red lines are the upland Sandy flood lines (minus part the Fort Defiance Island area which is missing dry non flood area during...