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Pennsylvania Valley Segment Statistics 2019

2025 - The Pennsylvania State University


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REST: https://imagery.pasda.psu.edu/arcgis/rest/services/pasda/DEP_Geomorphon_2019/MapServer
WMS: https://imagery.pasda.psu.edu/arcgis/services/pasda/DEP_Geomorphon_2019/MapServer/WMSServer?SERVICE=WMS&request=getcapabilities
ADDITIONAL RESOURCES
n/a
ABSTRACT
This dataset contains polygon shapefiles of segmented valley bottoms derived from the dataset “Pennsylvania Valley Bottom Polygons 2019”. Valley bottoms were segmented at 200 m intervals, and for each segment the following parameters were calculated and included: DrArea: Upstream drainage area (square meters) ValLength: Valley length (meters) StrLength: Total length of streams (meters) ValWidth: Average valley width, calculated as area divided by valley length (meters) StrWidth: Average total stream width, calculated as stream area divided by stream length (meters) AreaRatio: Stream area divided by area of valley (dimensionless) LngthRatio: Stream length divided by length of valley (dimensionless) Cnfinement: Stream-valley confinement ratio, a confinement index calculated as the length of the stream contact with valley walls divided by the total valley wall length (dimensionless) The calculations in this dataset derive from the datasets “Pennsylvania Valley Bottom Polygons 2019”, “Pennsylvania Stream Polygons 2019”, “Pennsylvania 3m lidar flow accumulation 2019”, and “Pennsylvania Stream Valley Intersections 2019”. To clean the dataset, valley segments were removed where: the valley length or stream length was less than 100 m; where the stream length to valley length ratio was less than 0.75, or where valley wall length divided by valley length was greater than 3. This project was funded by the Pennsylvania Department of Environmental Protection (PADEP) through its Water Program. April 2025.