Airport References Points (ARP) - An airport reference point (ARP) is the center point of an airport, located at the geometric center of all the usable runways. The public and private facility types shown (airport, heliport, ultralight, seaplane base) were extracted from the Federal Aviation Administration's (FAA) Airport Data and Information Portal (ADIP) at https://adip.faa.gov/agis/public/. The Wisconsin Department of Transportation's Bureau of Aeronautics (WisDOT BOA) joins additional attributes about facility system plans and state airport system plan (SASP) classifications to the ARP's in this data layer. FAA's ADIP site contains the most current airport and aeronautical data available.This data is intended to provide general guidance and airport information for highway construction projects in and around Wisconsin airports, specifically to make contractors and consultants aware of these areas.

Wisconsin airport runway areas represent the designated runway area extending the width of a runway from the runway centerline. Runway areas are derived from lines connecting runway endpoints; endpoints are published by the Federal Aviation Administration (FAA) in the Airport Data and Information Portal at: https://adip.faa.gov/agis/public/#/public. This data is primarily used for cartographic purposes or to construct finding sketches for airport projects. Runway areas are updated annually or as needed and may not represent current conditions at an airport. FAA's ADIP site contains the most current airport and aeronautical data available.

Wisconsin airport runway centerlines represent the center of the runway from the end to end and include displaced thresholds when applicable. Centerlines are derived from runway endpoint data and displaced runway threshold data published by the Federal Aviation Administration (FAA) in the Airport Data and Information Portal at:https://adip.faa.gov/agis/public/#/public. This data includes centerline lengths (in feet) between displaced runway thresholds or runway ends for public and private use airports in Wisconsin. Additional runway information is also provided such as the runway designation, runway width (in feet), surface condition, and FAR Part 77 categories for base and reciprocal runway ends. Runway centerlines are updated annually or as needed and may not represent current conditions at an airport. FAA's ADIP site contains the most current airport and aeronautical data available.

Wisconsin Airport FAR Part 77 Imaginary Surfaces are established with relation to the airport and to each runway. Imaginary surfaces include Primary, Approach, Transitional, Horizontal and Conical and are defined inhttps://www.ecfr.gov/current/title-14/chapter-I/subchapter-E/part-77/subpart-C/section-77.19. Surfaces were drawn using the Esri Airports FAA FAR 77 tool (Aviation Airports license). The size of each surface is based on the existing approach category for each runway end when this data was last updated.Imaginary surfaces were created with respect to existing runway centerlines and airport elevations managed by the Wisconsin Department of Transportation's Bureau of Aeronautics from data published by the Federal Aviation Administration (FAA) in the Airport Data and Information Portal at: https://adip.faa.gov/agis/public/#/public. This data is updated annually or as needed and may not represent current conditions at an airport. FAA's ADIP site contains the most current airport and aeronautical data available.