Cadastral Audit and Assessments Using Unmanned Aerial Systems

Abstract

Ground surveys and remote sensing are integral to establishing fair and equitable property valuations necessary for real property taxation. The International Association of Assessing Officers (IAAO) has embraced aerial and street-view imaging as part of its standards related to property tax assessments and audits. New technologies, including unmanned aerial systems (UAS) paired with imaging sensors, will become more common as local governments work to ensure their cadastre and tax rolls are both accurate and complete. Trends in mapping technology have seen an evolution in platforms from large, expensive manned aircraft to very small, inexpensive UAS. Traditional methods of photogrammetry have also given way to new equipment and sensors: digital cameras, infrared imagers, light detection and ranging (LiDAR) laser scanners, and now synthetic aperture radar (SAR). At the University of Alaska Fairbanks (UAF), we work extensively with unmanned aerial systems equipped with each of these newer sensors. UAF has significant experience flying unmanned systems in the US National Airspace, having begun in 1969 with scientific rockets and expanded to unmanned aircraft in 2003. Ongoing field experience allows UAF to partner effectively with outside organizations to test and develop leading-edge research in UAS and remote sensing. This presentation will discuss our research related to various sensors and payloads for mapping. We will also share our experience with UAS and optical systems for creating some of the first cadastral surveys in rural Alaska.

Assessing the usefulness of the photogrammetric method in the process of capturing data on parcel boundaries

“…World literature features an increase in the popularity of photogrammetric documentation in the context of building and improving the 3D cadastre (Aringer and Roschlaub, 2014;Jazayeri et al, 2014). Nevertheless, using photogrammetric surveys in the works involving capturing data on boundaries is still a current topic (Cunningham et al, 2011). Some research studies were conducted, which aimed to verify the applicability and accuracy of the photogrammetric documentation for recording spatial information on the course of boundaries (Siriba, 2009).…”

Unmanned Aerial Systems in the Process of Juridical Verification of Cadastral Border

“…These terrestrial methods have a geometrical precision of 6 centimetres or less [HTW, 1994]. Therefore, accurate geometrically corrected ortho-mosaics need to be created from the high-resolution aerial images [Cunningham, 2011]. An ortho-mosaic gives an equal and uniform view of the local terrain situation with a uniform scale and minimal geometric distortions, so that true coordinates and distances can be measured [Flury, 2011].…”

Applicability Analysis of Ultra-Light Uav for Flooding Site Survey in South Korea

“…On the outside, Cunningham et al (2011) presents the various sensors and payloads for mapping, and share his experience and optical systems for creating some of the first cadastral surveys in rural Alaska. Lambers et al (2007) describes the combined use of a mini helicopter and a terrestrial laser scanner, both equipped with a camera, allowed a fast yet accurate recording of the site and its stone architecture.…”