{ "culture": "en-US", "name": "", "guid": "", "catalogPath": "", "snippet": "The purpose of this dataset is to help assess the impervious surfaces in the county, particularly for commercial and industrial parcels. Such assessment can be useful for storm water modeling and management, storm water fee assessment, planning, build-out analysis, mapping, and overlaying with other datasets as needed.\n\nThe collection of aerial photography and production of an ortho quality DEM and orthophotography was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS analysis. Orthophotography along with DEM data typically provides an accurate base for digitally representing geographic features upon which a GIS is built. The Virginia Geographic Information Network Division (VGIN) is the lead public agency in the Commonwealth for spatial data and GIS. VGIN's mission is to facilitate the cost-effective development and use of spatial data, GIS, and related technologies in organizations throughout the Commonwealth.\n\nLevel: \nOwner: \nUpdated: \nFrequency:", "description": "

Polygon feature class showing impervious features in Prince William County. Impervious surfaces limit natural infiltration rates into the ground. When impervious surfaces data is collected by contractors, they use a 200 square foot minimum area threshold. The initial impervious features were compiled from 1' resolution imagery collected in leaf-off conditions in March 2011 by Sanborn. Since then additional features have been added from As-Built Plans. The Source and Date of the features are indentified in the Source and Update field of each feature. Impervious surfaces (pavement, buildings, structures, includes compressed areas such as dirt roads, also pools)<\/SPAN><\/P>

In the spring of 2017, the Commonwealth of Virginia, through the Virginia Geographic Information Network Division (herein referred to as VGIN) of the Virginia Information Technologies Agency (VITA) contracted with Fugro Geospatial, Inc. to provide aerial data acquisition, ground control, aerial triangulation and development of statewide ortho quality DEM and digital orthophotography data. The Virginia Base Mapping Program (VBMP) update project is divided into three collection phases: In 2017, Fugro flew the eastern third of Virginia at one foot resolution, with options for localities and other interested parties to upgrade resolution or purchase other optional products through the state contract. The middle third of Virginia will be flown in 2018 and the western third in 2019. Ortho products are 1-foot resolution statewide with upgrades to 6-inch resolution tiles and 3-inch resolution tiles in various regions within the project area. The Virginia Base Mapping project encompasses the entire land area of the Commonwealth of Virginia over 4 years. The State boundary is buffered by 1000'. Coastal areas of the State bordering the Atlantic Ocean or the Chesapeake Bay are buffered by 1000' or the extent of man-made features extending from shore. This metadata record describes the generation of new Digital Terrain Model (DTM) and contours generated at 2-foot intervals. All products are being delivered in the North American Datum of 1983 (1986), State Plane Virginia North. The vertical datum was the North American Vertical Datum of 1988 (NAVD88) using GEOID12B.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "summary": "The purpose of this dataset is to help assess the impervious surfaces in the county, particularly for commercial and industrial parcels. Such assessment can be useful for storm water modeling and management, storm water fee assessment, planning, build-out analysis, mapping, and overlaying with other datasets as needed.\n\nThe collection of aerial photography and production of an ortho quality DEM and orthophotography was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS analysis. Orthophotography along with DEM data typically provides an accurate base for digitally representing geographic features upon which a GIS is built. The Virginia Geographic Information Network Division (VGIN) is the lead public agency in the Commonwealth for spatial data and GIS. VGIN's mission is to facilitate the cost-effective development and use of spatial data, GIS, and related technologies in organizations throughout the Commonwealth.\n\nLevel: \nOwner: \nUpdated: \nFrequency:", "title": "Impervious", "tags": [ "PWC", "Prince William", "Virginia", "Prince William County", "VA", "Commonwealth of Virginia", "NOVA", "Driveways", "Paved Surfaces", "Buildings", "Parking Lots", "planningCadastre", "Impervious", "imageryBaseMapsEarthCover", "environment", "Northern Virginia", "Roads" ], "type": "", "typeKeywords": [], "thumbnail": "", "url": "", "minScale": 500000, "maxScale": 5000, "spatialReference": "", "accessInformation": "Prince William County Department of Information Technology (DoIT), Geographic Information Systems (GIS) Division, Fugro, Inc:", "licenseInfo": "

  1. Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations.<\/SPAN><\/P><\/LI>

  2. All data Pursuant to Section 54.1-402, paragraph C of the Code of Virginia which is quoted below, since the data was not created, nor is it maintained under the supervision of a licensed land surveyor. \u201cAny determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvements to real property or for flood plain determination.\u201d<\/SPAN><\/P><\/LI>

  3. This data is for reference purposes only and should not be used for design work.<\/SPAN><\/P><\/LI>

  4. Prince William County hereby disclaims any and all liability or responsibility for any damage, injury, loss, claim, or lawsuit arising from any error, inaccuracy or other problem with either the digital maps contained with digital data delivery or digital data delivered. The User hereby releases the County, its officers, agents and all employees and volunteers, from all liability, damage, claims, injuries or suits arising from any such error, inaccuracy or problem. Furthermore, the User agrees to indemnify and hold harmless the County and its officers, agents and all employees and volunteers, from any and all claims, liability damages, injuries and suits arising from the use of the digital maps and data therein or thereon by the User, its employees or assignees, or by any third parties.<\/SPAN><\/P><\/LI>

  5. Prince William County reserves the right to deny access to certain datasets.<\/SPAN><\/P><\/LI>

  6. The digital maps and data provided hereunder are provided \"as is\" and the County expressly disclaims all warranties, UCC and otherwise, express or implied including warranties as to accuracy of the digital maps, data and merchantability and fitness for a particular purpose, and further expressly disclaims responsibility for all incidental, consequential or special damages arising out of or in connection with the use or performance of the digital maps and data.<\/SPAN><\/P><\/LI>

  7. User acknowledges this disclaimer of warranty and expressly waives all warranties express or implied and waives any right of claim for damages incidental, consequential or special, arising out of or in connection with the use or performance of the digital maps and data.<\/SPAN><\/P><\/LI><\/OL><\/DIV><\/DIV><\/DIV>" }