GISValTech2025: Full Schedule

Welcome to the 2025 GIS/Valuation Technologies Conference, taking place in Columbus, Ohio, March 3-6, 2025! This is where you review the comprehensive educational program for the conference and plan your agenda.

The Geospatial Professional Network (formerly URISA) and the International Association of Assessing Officers are once again pleased to co-host this important event. Attendees earn ample IAAO CE credits and GISP Education points.

More education! Attendees requested more workshops - the opportunity to dive deeper into important topics. So we have included four half-day workshops to the conference on Thursday afternoon. Be sure to check them out and plan accordingly!

Go to this page to register for the conference and make travel plans and review sponsor and exhibit packages. Take note of early bird discounts through January 6!

10:30am EST

Valuation Unchained: Machine Learning’s New Neighborhood

Tuesday March 4, 2025 10:30am - 12:00pm EST

Pheoris West B– 3rd Floor

This session introduces a novel method to improve location adjustments using a machine learning methodology and explores the creation of neighborhood boundaries by examining how these boundaries might impact mass valuation models.

Enhancing Property Location Adjustments Using Spatial Interpolation
Daniel Fasteen, Ph.D., Senior Data Scientist, Tyler Technologies, Rosemount, MN
What’s New in the Neighborhood?
Russ Thimgan, President, Thimgan & Associates, Goodyear, AZ
Leah Thimgan, Operations Director, Thimgan & Associates, LaJunta

Moderators

Thomas Swingle

Deputy Assessor, Adams County

Speakers

Daniel Fasteen, PhD

Senior Research Scientist, Tyler Technologies

Daniel Fasteen, Ph.D. is a Senior Research Scientist with Tyler Technologies. Since 2010, Daniel has worked various roles in both the private and local government sector as a CAMA manager, product manager, research scientist, and consultant focusing on GIS application, property... Read More →

Russ Thimgan

President, Thimgan & Associates

Russ extended experience in the assessment field, coupled with involvement in Ad Valorem Taxation since 1988, makes him a valuable asset in determining assessment needs. With an Economics degree, he is an expert in mass appraisal.His work with over 30 different jurisdictions and lending... Read More →

Leah Thimgan

Operations Director, Thimgan & Associates

Tuesday March 4, 2025 10:30am - 12:00pm EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

2:00pm EST

Moneyball for Commercial Real Estate: Sales, Income, and AI Models

Tuesday March 4, 2025 2:00pm - 3:30pm EST

Pheoris West B– 3rd Floor

This session explores the key variables that drive successful commercial sales and income models. It compares sales and income models, examining when each is most appropriate, and highlights the benefits of AI in model formats. The session also offers insights into integrating these models with CAMA systems and addresses challenges in valuing mixed-use buildings by applying location and use-specific rates.

Commercial Sales and Income Models
Robert Gloudemans, FIAAO, Mass Appraisal Consultant, AZ
Valuation of Multi-Purpose Buildings
Kevin Keene, Owner/Operator, Keene Mass Appraisal Consulting, Philadelphia, PA

Moderators

Megan Lukens

Assessment Business Systems Manager, City of Madison

I fell into the assessing world with Tyler Technologies back in 2002. I have had opportunities to work at the jurisdictional level, the county level, and for an oversight agency at the state level. I currently work for the City of Madison, WI as the Assessment Business Systems Manager... Read More →

Speakers

Robert Gloudemans, FIAAO

Mass Appraisal Consultant

Bob is a Mass Appraisal Consultant and longtime partner in the partnership. Almy, Gloudemans, Jacobs & Denne. Previously he worked for IAAO and the AZ Dept of Revenue.Bob provides consulting services in mass appraisal and ratio studies and has assisted over 100 clients in the U.S... Read More →

Kevin Keene

Owner/Operator, Keene Mass Appraisal Consulting

Kevin Keene served the City of Philadelphia for over 30 years as a Real Property Evaluator; Mass Appraisal Analyst; Real Property Supervisor; GIS Manager; Modeling Director and Director of Mass Appraisal and Analysis. He personally designed and directed over sixteen major revaluation... Read More →

Tuesday March 4, 2025 2:00pm - 3:30pm EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

4:00pm EST

SHAPs and Rec: Navigating Valuation with SHAP and Time Trend Methods

Tuesday March 4, 2025 4:00pm - 5:00pm EST

Pheoris West B– 3rd Floor

This session will showcase how machine learning and SHAP values can reveal inequities in property valuations, offering actionable insights into the drivers of disparities. Join this session to also explore a comparison of current time trend methods with the Kalman filter approach for building time adjustments, enhancing valuation accuracy.

Practical Implementation of Rocket Science in Developing Time Trends
Jeremy Eye, Senior Data Analyst, Boulder County Assessor’s Office, CO
Wendell Salas, Senior Data Analyst, Boulder County Assessor's Office, CO
Enhancing Ratio Studies with AI: Identifying Sources of Inequity with SHAP Values
Paul Bidanset, Founder/Research Scientist, Center for Appraisal Research and Technology, Virginia Beach, VA
Joe Werhli, Enterprise Architect, Tyler Technologies

Moderators

Daniel Fasteen, PhD

Senior Research Scientist, Tyler Technologies

Speakers

Jeremy Eye

Senior Data Analyst, Boulder County Assessor’s Office

Wendell Salas

Senior Data Analyst, Boulder County Assessor's Office

Paul Bidanset

Founder/Research Scientist, Center for Appraisal Research and Technology

Paul Bidanset is an international AVM consultant and founder of the Center for Appraisal Research and Technology (CART), a nonprofit dedicated to promoting appraisal equity through free research, workflows, and technology. He has most recently worked with the governments of Moldova... Read More →

Joe Wehrli

Enterprise Architecture Manager, Tyler Technologies

Joseph Wehrli (Joe) is an enterprise architect and computer scientist at Tyler Technologies, where he conducts research and development in property valuation and tax administration systems.Joe has contributed to a wide range of property valuation and tax administration products and... Read More →

Tuesday March 4, 2025 4:00pm - 5:00pm EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

9:00am EST

Cracking the Code of Vertical Inequity

Wednesday March 5, 2025 9:00am - 10:00am EST

Pheoris West B– 3rd Floor

This session will address the often-overlooked challenge of selecting the best market value proxy when detecting vertical inequity in mass valuations. Using a real-world dataset and Monte Carlo simulations, the presentation will demonstrate how bias varies with different proxies. Finally, a new statistical market value proxy will be introduced to improve valuation accuracy.

Proposing a New Market Value Proxy for Vertical Inequity Detection
Josh Myers, Mass Appraisal Consultant, Josh Myers Valuation Solutions, Chesapeake, VA

Speakers

Josh Myers

Mass Appraisal Consultant, Josh Myers Valuation Solutions

Josh is a mass appraisal consultant with Josh Myers Valuation Solutions which offers various consulting solutions in the mass appraisal field, including valuation model development and ratio studies. He is an IAAO Award Winner, a member of IAAO Editorial Review Board, and a current... Read More →

Wednesday March 5, 2025 9:00am - 10:00am EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

10:30am EST

Game of Homes: Navigating Valuation Factors and Hidden Risks

Wednesday March 5, 2025 10:30am - 12:00pm EST

Pheoris West B– 3rd Floor

Valuation is coming! This session covers key factors in valuation, including location, time adjustments, square footage, construction quality, and property condition, providing practical guidance for assessors to improve their methods and avoid common pitfalls. This session also examines how proximity to residential meth labs affects nearby property values in Albuquerque using GIS and spatial regression techniques.

Is There a Heisenberg Effect? Using GIS to Investigate the Impact of Residential Meth Labs on Nearby Property Values in Albuquerque, NM
Damian Lara, Esq., Residential Manager, Bernalillo County Assessor’s Office, NM
Fabian Montoya, Deputy Assessor, Bernalillo County Assessor’s Office, NM
Paul Bidanset, Founder/Research Scientist, Center for Appraisal Research and Technology
Model Mastery: Five Characteristics That Make or Break Your Model
Jake Parkinson, Assessor Consultant, Valuebase, Salt Lake City, UT

Speakers

Damian Lara, Esq.

Assessor, Office of the Bernalillo County Assessor

Damian R. Lara brings a wealth of experience and unique perspective to his role as Bernalillo County Assessor. His experience as a young person working the fields in southeastern New Mexico and exposure to stark differences in the quality of life among neighboring communities inspired... Read More →

Fabian Montoya

Deputy Assessor, Bernalillo County Assessor’s Office

Mr. Fabian M. Montoya, Residential Manager at the Bernalillo County Assessor’s Office, is responsible for fairly and equitably assessing approximately 250,000 parcels. On average 10,000 parcels change ownership, 5,500 building permits are issued, and 4,000 property owners protest... Read More →

Paul Bidanset

Founder/Research Scientist, Center for Appraisal Research and Technology

Jake Parkinson

Assessor Consultant, Valuebase

Jake Parkinson is currently Assessor Coordinator for Valuebase. Most recently he was the Tooele County Assessor, but he also holds a Certified Residential Appraiser License with Utah Division of Real Estate and an Ad Valorem General Designation from Utah State Tax Commission. He is... Read More →

Wednesday March 5, 2025 10:30am - 12:00pm EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

2:30pm EST

It’s Always Sunny AVM’s in the Northeast

Wednesday March 5, 2025 2:30pm - 3:30pm EST

Pheoris West B– 3rd Floor

This session will present a case study on the 2024 revaluation of Central Falls, a small city with 3,000 parcels, comparing modern revaluation tools like regression and AVM against traditional market-adjusted cost methods. Additionally, we will explore a real estate data visualization tool created for Philadelphia (~ 600,000 parcels) which integrates city and external data sources to support decision-making for various users like homeowners, developers, and city planners.

Central Falls Case Study – Testing Modern Approaches to Value in a Small New England Community
Daniel Ducharme, Ph.D., RICA, Assessor, Central Falls, RI
Creating Value Through Connecting Siloed Big Data
Jimmy Williams, Mass Appraisal Supervisor, Philadelphia Office of Property Assessment, PA
Alex Raju, Supervisor of Analytics, Philadelphia Office of Property Assessment, PA

Moderators

Kevin Keene

Owner/Operator, Keene Mass Appraisal Consulting

Speakers

Daniel Ducharme, Ph.D., RICA

Assessor, Central Falls, RI

Jimmy Williams

Mass Appraisal Supervisor, Philadelphia Office of Property Assessment

Jimmy is the Mass Appraisal Supervisor with the Philadelphia Office of Property Assessment (OPA) . He has been with OPA for over 25 years and has held several positions that include Clerical, Residential Assessor, Analyst and now Mass Appraisal Supervisor. His Education includes a... Read More →

Alex Raju, CPE

Supervisor of Analytics, Philadelphia Office of Property Assessment

Works with the City of Philadelphia - Office Of Property Assessment. From training, to data analytics, to data sciengineer, to modeling, to residential evaluation; he keeps seven of his fingers in various roles. Two he keeps reserved for new roles. One is left at home just in case... Read More →

Wednesday March 5, 2025 2:30pm - 3:30pm EST
Pheoris West B– 3rd Floor

MODELING & VALUATION

9:00am EST

Valuations in the Age of Machine Learning

Thursday March 6, 2025 9:00am - 10:30am EST

Pheoris West B– 3rd Floor

This presentation explores the transformative role of AI technologies, such as machine learning and computer vision, in enhancing accuracy, efficiency, and fairness in mass property appraisal. By examining AI applications like automated valuation models (AVMs), image recognition, and predictive analytics, attendees will gain insight into how AI improves property valuations. The session will also address ethical considerations, biases, and future directions in the field, offering practical case studies and implementation tips for assessors.

Latest AI Trends and Their Impact on Mass Appraisal
Shail Jain, CEO, Farragut Systems, Durham, NC
Cowculating the Promise of Machine Learning in Assessment
Brady Andersen, Appraiser, Weber County Assessor's Office, Ogdent, UT
Nick Morgan, Engineer, Valuebase, Austin, TX

Moderators

MODELING & VALUATION