Abstract

Survey-Aware Analytic Adjustment of Maricopa County's 1.5 Million Parcels
Track: Implementing Survey Data in GIS
Author(s): Rudy Stricklan, Frank Harrison

At nearly four million inhabitants, Maricopa County in south-central Arizona is the nation's fourth-largest county population-wise, and fourteenth-largest in terms of area. The GIS/Mapping Department of the Maricopa County Assessor's Office is responsible for mapping the County's 1.5 million+ tax parcels. An original manual-to-digital mapping conversion process was completed in 2001, resulting in a continuous parcel spatial database. However, when overlaid to survey-controlled orthophotography, many of the parcel boundaries were significantly offset from their apparent ground occupation lines. In 2007, the Assessor's Office initiated a project to adjust its parcel database to the orthophotography. The approach was to employ an analytic adjustment approach that used the County's Geodetic Densification and Control Survey's network of 13,000+ points and ESRI GIS processing techniques to quantifiably improve the position of parcel boundaries. This presentation will discuss the County's unique approach to large-scale parcel adjustment, its anticipated benefits and project status/lessons learned to date.

Rudy Stricklan
Engineering Mapping Solutions, Inc.
2330 West Mission Lane
Suite 1
Phoenix , Arizona 85021
United States
Phone: 602-618-9338
E-mail: rudy.stricklan@emsol.com

Frank Harrison
Maricopa County Assessor's Office
301 West Jefferson Street
Phoenix , Arizona 85048
United States
Phone: 602-506-8635
E-mail: fharris@mail.maricopa.gov