Description: Chesapeake Conservancy’s high-resolution land cover reclassed into three categories: restoration opportunity areas, conservation opportunity areas and flow path developed areas; clipped to the 35’ buffer zone of the enhanced flow path dataset by county. The land cover classes were reclassed as follows:High resolution land cover classFlow path 35’ buffer classWaterNo dataWetlandsRestoration opportunity areasTree CanopyConservation opportunity areasShrublandConservation opportunity areasLow VegetationRestoration opportunity areasBarrenRestoration opportunity areasStructuresDeveloped AreasImpervious SurfacesDeveloped AreasImpervious RoadsDeveloped AreasTree Canopy over StructuresDeveloped AreasTree Canopy over Impervious SurfacesDeveloped AreasTree Canopy over Impervious RoadsDeveloped AreasHigh-Resolution Land Cover: User Guide and Accuracy Assessment. Twelve land cover classes were mapped: 0 - Background,1 - Water, 2 - Wetlands, 3 - Tree Canopy, 4 - Shrubland, 5 - Low Vegetation, 6 - Barren, 7 - Structures, 8 - Impervious Surfaces, 9 - Impervious Roads, 10 - Tree Canopy over Structures, 11 - Tree Canopy over Impervious Surfaces, 12 - Tree Canopy over Impervious Roads. The complete class definitions and standards can be viewed here: http://goo.gl/THacggEnhanced Flow Paths: Documentation and Accuracy Assessment.
Service Item Id: 3454ea56e6cd427abbabedd6937a16f9
Copyright Text: Chesapeake Conservancy, Conservation Innovation Center, Chesapeake Bay Program, University of Vermont Spatial Analysis Laboratory
Description: The enhanced flow path dataset (water network) created from using the Chesapeake Conservancy's flow path analysis methodology, combining terrain/elevation data and the Chesapeake Conservancy’s high resolution land cover.The Lidar-derived digital elevation model (Statewide DCNR PAMAP 2006-2008 - Quality Level 3 LiDAR - 1 meter DEM) was hydro-conditioned (breached and filled) using the open-source software SAGA and ArcGIS Hydrology toolbox. Flow direction and Flow accumulation rasters were calculated to delineate flow paths. An accumulation threshold of 60 acres of upslope land was applied to identify a given pixel as a channel head; anything downstream of that channel head is identified as a flow path. The flow paths were then widened based on the total upslope area and the USGS regional curve equation for the Coastal Plain region of MD and VA. Large rivers and other open water features classified as “water” in the high resolution land cover dataset were added to the widened flow paths dataset. This final integration is the “enhanced flow path dataset.” Follow the link to see the Chesapeake Conservancy's PA stream mapping accuracy assessment.
Service Item Id: 3454ea56e6cd427abbabedd6937a16f9
Copyright Text: Chesapeake Conservancy, Conservation Innovation Center, Chesapeake Bay Program, University of Vermont Spatial Analysis Laboratory