GIS/ValTech 2027

Join the Conference Committee for breakfast and a debrief to reflect on the conference, share feedback and observations, and discuss highlights, lessons learned, and opportunities for future events.

Skagit County, WA: a non-developer built and shipped a free suite of browser-based tools — sales ratio analysis, exemption screening used across all 39 counties, a levy trends visualizer — each a single HTML file, no backend, no procurement. AI-assisted development got it built; discipline is what made it trustworthy — validated against certified output, root-caused on real data, defensible at a Board of Equalization hearing.

Maricopa County, AZ: a Comparable Sales tool from 2009 had held appraisers together for two decades. Going remote forced a rebuild, so the team modernized it with open-source tools — Python, Shiny, Leaflet, SQLite.

Different tools, same lesson: you don't need a developer, a budget, or a procurement cycle. Just the right approach — and the discipline to trust what you ship.

From Assessor to Builder: Shipping Free, Audit-Ready Tools Without a Developer
Keywords: Workflow Automation & Custom Tools, Artificial Intelligence & Machine Learning, Intermediate
Danny Hagen, Assessor, Skagit County, Washington

Modernizing the Computator: Revamping an Open-Source Comparable Sales Tool
Keywords: Workflow Automation & Custom Tools, GIS & Spatial Analysis, Mass Appraisal & Valuation Modeling, Beginner
Autumn Mittemiller, Data Scientist, Maricopa County (Arizona) Assessor’s Office
Leroy Johnson, AAS, Data Scientist, Maricopa County (Arizona) Assessor’s Office

This presentation provides a comprehensive, practical framework for strengthening disaster preparedness and ensuring continuity of operations within assessor offices. Drawn from real disaster experiences, it guides participants through both immediate post-incident response actions and essential pre-disaster planning measures that safeguard staff, facilities, digital systems, and core assessment functions. The program outlines a structured response timeline—from Day One through the First 30 Days—to help Assessor offices stabilize operations, restore critical workflows, support public communication, and resume property assessment responsibilities following a disruption.
In addition, the presentation delivers actionable preparedness strategies, including staff safety protocols, facility and physical asset protection, IT resilience planning, public communication readiness, interagency coordination, and Continuity of Operations Plan (COOP) development. Participants receive practical takeaway checklists, templates, and planning tools that can be immediately applied to their own assessor offices. By expanding awareness of the full range of hazards—natural, technological, cyber, infrastructure, and organizational—the session equips assessor offices with the knowledge and resources necessary to minimize operational interruptions and maintain vital public and statutory services during emergencies.

Janet Jennings-Doyle, RPA, CCA, RTA, CTA, Director of Internal Audit and Compliance Department, Travis Central Appraisal District, Austin, TX
Susan Powell-Chehadi, Chief Deputy Assessor, Boulder County Assessor’s Office, CO

Keywords: Disaster Preparedness & Continuity, Process Improvement & Operations, Intermediate

AI is moving quickly from research papers and experimental models into the everyday work of assessment offices. This session explores what the research tells us about AI and machine learning in property valuation, then looks at how emerging tools help assessors automate workflows, uncover insights, improve valuations, and make better decisions while keeping human judgment, transparency, and public trust at the center.

The AI-Assisted Assessor: How Technology is Reshaping Appraisal & Assessment
Keywords: Artificial Intelligence & Machine Learning, Change Management & Technology Adoption, Beginner
Andrew Harrison, Vice President, State & Local Government Sales, Schneider Geospatial

AI in Property Valuation: Research Practice and Emerging Applications
Keywords: Artificial Intelligence & Machine Learning, Mass Appraisal & Valuation Modeling, GIS & Spatial Analysis, Beginner
Daniel Fasteen, Ph.D., Senior Research Scientist, Tyler Technologies

IAAO Cadastral & Ratio Study Standard Update

Ratio Study Standard Update
Members of the IAAO Research & Standards Committee

Cadastral Mapping Standard Update
Nathan Langdon, GIS Mapping/Property Ownership Manager, Maricopa County Assessor’s Office - AZ
Lauren Voelker, Sr. Solution Engineer, Esri - MO
Alex Hepp, Director, Assessment, Cyclomedia Technology - NJ