Standard on Digital Cadastral Maps and Parcel …

1 Standard on Digital Cadastral Maps and Parcel identifiers Approved January 2015. International Association of Assessing Officers This Standard replaces the January 2012 Standard on Digital Cadastral Maps and Parcel identifiers . IAAO assessment standards represent a consensus in the assessing profession and have been adopted by the Executive Board of the International Association of Assessing Officers (IAAO). The objective of the IAAO standards is to provide a sys- tematic means for assessing officers to improve and standardize the operation of their offices. IAAO standards are advisory in nature and the use of, or compliance with, such standards is voluntary.

2 If any portion of these standards is found to be in conflict with national, state, or provincial laws, such laws shall govern. Requirements found in the Uniform standards of Professional Appraisal Practice (USPAP) also have precedence over technical standards . Acknowledgments At the time of 2014 revision (approved January 2015), the Technical standards Committee comprised Bill March- and, chair; Alan Dornfest, AAS; Doug Warr, AAS; Michael Prestridge, Mary Reavey; Carol Niehardt, associate member; and Chris Bennett, staff liaison. The project leader for the revision was Michael Prestridge.

3 The Standard benefited from recommendations and review by David Wright; Amber Reynolds, GISP; Melissa Crane; Bill Wadsworth; Richard Almy; Bob Denne; Wilma Robertson, GISP; Sam Pintacura, CMS, GISP; Pete Davis; Brent Jones; Nancy von Meyer, , GISP; Ed Crane; Josephine Lim, ; Tom Canter; Frank Conk- ling, GISP, PSM; Matthew Kalus, GISP, PSM; Joe Ward; Ellen Edwards; Todd Comer, GISP; Susan Marlow; Peirce Eichelberger; Aaron Judy; David Moss; Russ Heisinger; David Saavedra; Shelby Johnson; and Cooper Keller, GISP. Revision Notes The previous revision of the Standard on Digital Cadastral Maps and Parcel identifiers was approved in January 2012.

4 Published by International Association of Assessing Officers 314 W 10th St Kansas City, Missouri 64105-1616, United States 816/701-8100. fax: 816/701-8149. ISBN 978-0-88329-218-1. Copyright 2015 by the International Association of Assessing Officers All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. However, assessors wishing to use this Standard for educating legislators and policymakers may photocopy it for limited distribution.

5 Contents 1. 5. 2. 5. The Role of the 5. The Value and Importance of Digital Cadastral 5. Value to the 6. Value to Other Users in a Multipurpose Cadastre 6. 3. Core Components of a Digital Cadastral Mapping 6. Geodetic 6. 7. Core Cadastral Map 7. Parcel 7. Elements of a Digital Cadastral Mapping System for Use in a Multipurpose Cadastre Environment .. 8. Additional Map Layers in a Multipurpose 8. Map 8. Program 9. Staff and 9. Procedures, standards , and 9. 4. Preparation for a Digital Cadastral Mapping 9. Needs Digital Cadastral Map Scanned Scanned and Georeferenced with Data Coordinate Geometry (COGO).

6 10. Data Technical Pilot Assembling Source Contracting for Mapping 5. Mapping System Ownership Cadastral Layer Multipurpose Map Layer 6. Quality Horizontal Spatial Quality Control Other Quality Control Parcel Area and Edge-Matching to Adjacent Parcel 7. Parcel Desirable Compliance with Simplicity and Ease of Ease of Types of Parcel Geographic Coordinate Systems Rectangular Survey System Map-Based Systems Name-Related Assignment and Maintenance of Parcel Appendix. Parcel Core Data Standard ON Digital Cadastral MAPS AND Parcel identifiers 2015. Standard on Digital Cadastral Maps and Parcel identifiers 1.

7 Scope Some nations are likely to embrace different divisions This Standard provides recommendations on the devel- of Cadastral mapping responsibilities, that is, among multiple national agencies and levels of government opment and maintenance of a Digital Cadastral mapping ( , the Cadastral agency, the ministry of finance, and program for the purpose of assessing real property. It local levels of government). describes a Digital Cadastral mapping system program, its components, Cadastral data, content, design, cre- ation, maintenance, contracts, and administrative con- The Role of the Assessor trols within the context of a multipurpose cadastre.

8 It The assessor may assume many different roles in the also discusses the processing of title records, and par- management, maintenance, and stewardship of a juris- diction's Digital Cadastral mapping system. The assessor, cel identifiers , and Parcel identification systems. This or an authorized agent, should be the data steward for Standard also addresses the interaction between the Parcel and assessment data and possess the ultimate au- creators and maintainers of Cadastral map data lay- thority to inventory, create, and define all parcels and ers, users of broader geospatial information systems, other Cadastral layers.

9 The assessor should maintain and consumers of multipurpose Cadastral data, and Parcel identifiers for assessment purposes. The assessor provides context for those interactions. State mapping may be involved in creating and maintaining data relat- functions not related to the construction of Cadastral ed to the Parcel map, such as street centerlines, zoning, layers are not addressed in this Standard . Technical as- and other multipurpose layers. In contrast, the role of pects and recommendations may also be applicable to the assessor may be limited to maintaining all Cadastral contractual services and state and provincial systems layers and Parcel identifiers , leaving responsibility for other noncadastral data layers to other offices or to a provided for local assessor use.

10 International aspects jurisdiction-wide geographic information system (GIS). are addressed in the paper "Guidance on International agency or information technology (IT) department. Mass Appraisal and Related Tax Policy," issued by Additionally, the assessor should work closely with GIS. IAAO in January 2014. For information on manual or IT agencies that creates and maintain GIS data, in- Cadastral mapping see the Standard on Manual Cadas- cluding Cadastral data, to ensure continuity and stan- tral Maps and Parcel identifiers (IAAO 2004). dardization for business processes.