Airport Part 77 Surfaces - Horizontal: Iowa
- Iowa DOT GIS Services
- The Horizontal surface is a plane 150 above the established airport elevation. The perimeter of which is constructed by swinging arcs of specified radii from the center of each end of the primary surface and connecting adjacent arcs by lines tangent to those arcs.
- ArcGIS Open Data
- Iowa, United States
- Contributed by:
- More details at
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