20170404 10254500 1.0 FGDC CSDGM Metadata FALSE Impervious_2015_Delaware 448790.086700 481576.213400 4406247.708400 4435147.688200 1 002 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) NAD_1983_UTM_Zone_18N <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.3.0'><WKT>PROJCS["NAD_1983_UTM_Zone_18N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-75.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26918]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26918</WKID><LatestWKID>26918</LatestWKID></ProjectedCoordinateSystem> 20241111 20281600 20241202 18403600 ISO19139 150000000 5000 ArcGIS Metadata 1.0 2015 Impervious Surface - Delaware County, PA 2016-12-16 vector digital data William Stevens Delaware Valley Regional Planning Commission 190 N. Independence Mall West, 8th Floor Philadelphia PA 19106-1520 wstevens@dvrpc.org US 215-592-1800 William Stevens Manager, Office of Geographic Information Systems <DIV STYLE="text-align:Left;"><DIV><DIV>This dataset contains impervious landbase features updated using digital orthoimagery acquired in 2015 by the Delaware Valley Regional Regional Planning Commission (DVRPC) and its partners. This is an update of existing features originally captured in 2013 using 2010 orthoimagery. Additionally, estimated building heights were derived from high resolution normalized digital surface elevation data models generated from NIR LiDAR data using the highest hit method. Digital surface elevation models were derived from LiDAR data collected by Quantum Spatial and other vendors and compiled for delivery to USGS and its partners. The horizontal datum for this dataset is North American Datum, 1983, Geoid GRS 1980, and the data is projected in Lambert Conformal Conic StatePlane Pennsylvania South (FIPS 3702). Units are US Foot. The minimum size for building features is 200 square feet.Please note that since this data is an update to data originally created using 2010 aerial imagery, many of the features may not appear to be positionally accurate when used with newer imagery.Heights provided for 'Building' class impervious surface features are estimates of 90th and 50th percentile statistical distribution and should be considered approximate.Process Steps for Calculating Building Height Statistics:Normalized digital surface models (nDSM) and slope rasters were generated from 0.5-meter LiDAR data.Geodesic area was calculated (in square feet) for all features classified as ‘Building’.A negative 1 meter buffer was applied to all building features with an area greater than 200 square meters - applied in an effort to ensure nDSM input values were those corresponding to the building roof and not the adjacent ground.Zonal statistics (Spatial Analyst extension) were calculated on the buffered features for each nDSM raster (first multiplying each raster by 10 to maintain precision and then converting from floating point to integer raster) and slope raster (generated from each integerized nDSM raster). Zonal percentile statistics were also calculated on buffered features for each raster to obtain the 90th percentile building heights (HEIGHT_ESTIMATE field).All output statistics fields were joined to the original input feature class (with unit conversions applied, where necessary).A complete dataset, which includes the following fields that are populated with various statistical outputs generated during the building height estimation process, is available upon request:HEIGHT_PCT90 – 90th percentile value of all cells in the nDSM raster located within the building footprint.HEIGHT_PCT50 – median value of all cells in the nDSM raster located within the building footprint.HEIGHT_COUNT – total number of cells with tabulated values in the nDSM raster located within the building footprint.SLOPE_MEAN – average of all cells in the slope raster located within the building footprint.SLOPE_STD – standard deviation of all cells in the slope raster located within the building footprint.SLOPE_COUNT - total number of cells with tabulated values in the slope raster located within the building footprint.</DIV></DIV></DIV> Provide digitized impervious surface features using digital orthoimagery acquired in 2015 by the Delaware Valley Regional Regional Planning Commission (DVRPC) and its partners. Delaware Valley Regional Planning Commission (DVRPC) impervious surface DVRPC Pennsylvania Delaware County Impervious Surface Structures Building Footprints Building Heights Buildings Roads Driveways Parking Lots Sidewalks <DIV STYLE="text-align:Left;"><DIV><DIV>https://catalog.dvrpc.org/dvrpc_data_license.html</DIV></DIV></DIV> -76.13389 -75.354311 39.708297 40.251491 Esri ArcGIS 13.3.2.52636 1 -75.600499 -75.215229 40.066385 39.804658 Impervious_2015_Delaware Feature Class 0 OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. OBJECTID OID 4 10 0 Shape Feature geometry. Esri Coordinates defining the features. shape Geometry 8 0 0 CLASS CLASS String 10 0 0 Type of impervious surface captured. The ‘Road’ class contains all concrete, paved and compacted gravel roads that exceed 500 feet in length. The ‘Other’ class contains driveways less than 500 feet in length, sidewalks, patios, pools and other impervious surfaces greater than 200 square feet. The ‘Building’ class captures all permanent buildings greater than 200 square feet. HEIGHT_STD Standard deviation of all cell values in the nDSM raster located within the building footprint (NoData values excluded). HEIGHT_STD Double 8 38 8 HEIGHT_ESTIMATE height_estimate Integer 4 10 0 Estimated Building Height (value from HEIGHT_PCT90 field rounded to nearest foot). st_area(shape) st_area(shape) Double 0 0 0 st_perimeter(shape) st_perimeter(shape) Double 0 0 0 Enterprise Geodatabase Feature Class dataset EPSG 6.11(3.0.1) 0 Simple FALSE 0 TRUE FALSE 20241202 Delaware Valley Regional Planning Commission 190 N. Independence Mall West, 8th Floor Philadelphia PA 19106-1520 US 215-592-1800 William Stevens William Stevens