Comprehensive Citywide Impervious Surfaces

The purpose of this layer is to provide an accurate representation of impervious surfaces in the City and County of Denver. This layer combines Stormwater Billing impervious surfaces with Planimetric impervious surfaces; allowing for a comprehensive, city-wide, impervious surface layer. This layer is a compilation of two independent sources of impervious surface data. The data is provided by both the City and County of Denver’s Wastewater Management Division-Customer Service (WMD-CS) and Kucera International Inc. The WMD-CS data represents areas digitized for all stormwater billing inspections after December 2002 and contains impervious surface delineations of each inspected property. These features are updated daily by WMD-CS field investigators and GIS personnel. The planimetric data, supplied by Kucera International Inc, defines the stereocompiled features of the DRCOG Denver Region Urbanized Project Area. The features were compiled from the Denver Regional Aerial Photography Project (DRAPP) 2016/2018/2020 Aerial Imagery Acquisition and Production. This 1"=100' scale imagery is comprised of 4-band RGBIR color orthoimagery with a GSD (Ground Sample Distance) of 0.5'. Imagery was collected with the Leica ADS40 and ADS80 digital sensors and processed with Leica XPro software. Imagery is projected in State Plane Coordinate System, Colorado central zone using the Lambert Conformal Conic map projection parameters. Horizontal and vertical datums are NAD83(11) and NAVD88(GEOID12A) respectively. The planimetric features are generally updated every two years.本图层旨在精准呈现丹佛市与丹佛县的不透水面分布状况。该图层整合了雨水计费不透水面数据与平面制图不透水面数据，可生成覆盖全市的综合不透水面图层。本图层由两份独立的不透水面数据源整合而成，数据分别由丹佛市及丹佛县废水管理部-客户服务处（WMD-CS）与库克拉国际公司（Kucera International Inc.）提供。WMD-CS数据集涵盖2002年12月后所有雨水计费巡检中数字化的区域，包含每处巡检物业的不透水面轮廓信息，该类要素由WMD-CS的现场调查人员与GIS技术人员每日更新维护。库克拉国际公司提供的平面制图数据，定义了丹佛地区委员会（DRCOG）丹佛区域城市化项目区的立体制图要素。此类要素源自丹佛区域航空摄影项目（DRAPP）2016、2018、2020年的航空影像采集与制作成果。该1英寸=100英尺比例尺的影像为4波段RGBIR彩色正射影像，地面采样距离（GSD, Ground Sample Distance）为0.5英尺。影像采用Leica ADS40与ADS80数字传感器采集，并通过Leica XPro软件进行后期处理。影像采用科罗拉多中央州平面坐标系，以兰勃特等角圆锥（Lambert Conformal Conic）投影参数进行投影。水平基准面与垂直基准面分别为NAD83(11)与NAVD88(GEOID12A)。平面制图要素通常每两年更新一次。