Supplemental Information: An overlay zone typically imposes a set of requirements in addition to those laid out by the underlying zoning regulations in the Land Use Code (LUC). The purpose of this overlay zone is to protect the health, safety, and welfare of persons and property in the vicinity of Tucson International Airport (TIA) and Davis-Monthan Air Force Base (DMAFB) and protect the long term viability of DMAFB. The exact boundaries of the IID overlay are identified on the official zoning maps kept on file in the offices of the Planning and Development Services Department and the City Clerks. Fall 2009 - Modified by Peter Johnson, City of Tucson GIS Services April 2009 - AIR_HZ replaced by AEZ_HZ, received minor update to relect a 2008 zoning code amendment. But height zone standards were not amended for any of the four regulated airports at this time. http://www.dot.pima.gov/gis/data/layers/aez_hz/ The purpose of the amendment was to implement land-use recommendations of the Arizona Regional Military Compatibility Project - Davis Monthan Air Force Base / Tucson / Pima County Joint Land Use Study as they apply to high-noise areas and approach-departure corridors of Davis-Monthan AFB. This study was accepted by Tucson City Council and the Pima County Board of Supervisors. Implementation for unincorporated Pima County included a Major Comprehensive Plan Amendment (Co7-04-03) approved on November 16, 2004 (Resolution 2005-40), and a zoning code amendment (Co8-05-01) approved on December 16, 2008 (Ordinance 2008-118). http://cms3.tucsonaz.gov/planning/maps/zoning/aztrs.htm http://cms3.tucsonaz.gov/sites/default/files/imported/prog_proj/projects/archive/airport/aezfaq100804.pdf Circa 1992 - AIR_HZ layer displayed the airport height overlay zones around airport runways, where buildings may not exceed the specified height.