State of Iowa

Airport Conical Surfaces

Name: Airport Conical Surfaces
Creator: State of Iowa

Geospatial data delineating the conical surfaces associated with Iowa airports, defined as extending outwards and upwards from the horizontal surface boundary at a 20:1 slope for 4,000 feet. Each record includes the polygonal geometry for a conical surface, along with identifiers for the associated airport and surface type.

Example records

Namebrand	Alternate Nameidentifier	Cityaddress	The Geomgeospatial	Objectididentifier	Airport Elevation (Ft Msl)quantity	Part 77 Surfaceclassification	Surface Descriptionadditional data	Inner Elevation (Ft Msl)quantity	Outer Elevation (Ft Msl)quantity	Surface Width (Ft)quantity	Surface Ratioquantity
JEFFERSON MUNICIPAL	EFW	Jefferson	MULTIPOLYGON (((-94.306269316266 42.007330996921,	2	1048	Conical Surface	Surface extends from periphery of horizontal surfa	1198	1398	4000	20:1
SIOUX GATEWAY/COL. BUD DAY FIELD	SUX	Sioux City	MULTIPOLYGON (((-96.399277424187 42.442594757978,	49	1098	Conical Surface	Surface extends from periphery of horizontal surfa	1248	1448	4000	20:1
GREENFIELD MUNICIPAL	GFZ	Greenfield	MULTIPOLYGON (((-94.46214536615 41.302908901847, -	112	1361	Conical Surface	Surface extends from periphery of horizontal surfa	1511	1711	4000	20:1

Use cases

Commercial Real Estate Airspace Encumbrance Screening

A commercial real estate lender underwriting a construction loan checks whether a proposed development site falls within an airport conical surface zone, which would cap allowable building height and affect collateral value and project feasibility.

The GeomOuter Elevation (Ft Msl)Inner Elevation (Ft Msl)NameCity

Telecom Tower Siting Compliance Check

A wireless infrastructure company evaluating candidate tower locations cross-references proposed coordinates against conical surface polygons to identify sites where FAA obstruction review would be required before permitting, narrowing the viable site list before field surveys begin.

The GeomOuter Elevation (Ft Msl)Surface RatioAlternate NameArea (Acre - State Plane)

Property Insurance Height Restriction Underwriting

A property insurer assessing a portfolio of Iowa industrial and warehouse facilities flags parcels that intersect conical surface zones, where any future vertical expansion would face federal height limits, affecting long-term replacement cost assumptions and policy terms.

The GeomInner Elevation (Ft Msl)Outer Elevation (Ft Msl)NameArea (Acre - State Plane)