The USGS is a science organization that provides impartial information on the health of our ecosystems and environment, the natural hazards that threaten us, the natural resources we rely on, the impacts of climate and land-use change, and the core science systems that help us provide timely, relevant, and useable information. http://www.usgs.gov/
Data depicts topographic Change in Philadelphia during the last century. Specifically, for the Frankford 7.5-minute quadrangle, which includes the Wissinoming neighborhood, and the Germantown 7.5-minute quadrangle, which includes the Logan and Feltonville neighborhoods. Data is derived from a variety of sources and estimates elevation change based on raster cells.
|Created||December 8, 2014|
|License||License Not Specified|