Stormwater Modeling Impervious Land Cover Type

Task4_ImperviousUpdate2022 - this feature class represents the complete set of impervious features created by the GeoTREE Center. The 2020 project used a multi-step geoprocessing workflow to import data from various sources provided by the City of Madison and then through visual interpretation and digitizing of features. The basic original process was to use a variety of semi-automated and manual geoprocessing to pull/create polygon features from a variety of feature classes provided by the City of Madison at the beginning of the project. These feature classes included curb lines (Curb_Line_Rd), bike/ped paths (Bike_Ped_Paths), buildings (Building_Footprint_DaneCo and SWU_ImperviousAreas), and water body areas (HydroPoly_RFPArea). After building these inherited polygons into this feature class the majority of the work in this project was digitizing impervious features in this feature class based on the Subtype schema associated with the source_area field in this feature class. That schema can be seen below: 0 Flat Roof 1 Sloped Roof 2 Parking 3 Unpaved Parking 4 Sidewalks 5 Driveways 6 Water Body Areas 7 Streets 8 Alleys 9 Playground 10 Other Impervious Areas 11 Landscaped Areas 12 Undeveloped Areas 13 Other Pervious Areas 14 Isolated Areas All original digitizing was done with 2018 imagery from https://gisimg.cityofmadison.com/arcgis/services/ImageServices/2018_CITY_COLOR/ImageServer. Descriptions of fields is below: source_area - this is the main field as required by the original RFP and in which the above subytpe schema was set up. When GeoTREE Center workers were editing they would choose from the subtype choices and create or edit polygons. GeometryFrom - this field will hold a value indicating the feature class that the original polygon was inherited from (e.g.. HydroPoly_RFPArea). It is still possible that a GeoTREE Center worker would have manually edited the polygons with a value in here although most of these geometries likely are directly inherited from the feature class indicated. The polygons with a value of Bike_Ped_Paths buffered' went through a process of buffering the original line features based on a width attribute and then were manually edited by GeoTREE Center workers as needed. The polygons with Curb_Line_RD with GeoTREE Edits in GeometryFrom field wrere the result of a multiple step geoprocessing workflow to translate the lines into polygons with significant manually editiing by GeoTREE Center workers. source_area_int - the integer value stored in source_area field source_area_desc - the source area description In 2022 the GeoTREE Center used imagery indicated below to visually inspect and digitize newly developed polygon features as well as to find changes in the built environment and to delete/edit/create new features as needed. The GeometryFrom column has a value of 'UNI GeoTREE Created 2022' the feature was created during this 2022 round of digitizing. https://gisimg.cityofmadison.com/arcgis/services/ImageServices/2020_CITY_COLOR_WEBMERC/ImageServer https://dcimapapps.countyofdane.com/arcgisimg/services/ColorOrtho6Inch2020WEB/ImageServer