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Boulder County Assessor's Office GIS staff work hands on with appraisers to improve data/attributes for mass appraisal. You will get a brief overview of how GIS is used to facilitate fieldwork, find and fix inaccurate attributes, and speed up the review and update of property information. Topics covered will include the mapping of features known to affect property values, as well as those not always associated with mass appraisal. Additionally, differences between data gathering for properties in the mountains vs. plains will be highlighted.
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Getting it Done
Using GIS to Help Appraisal Staff Rapidly Update and Improve Property Data
Pete Coventry, Adam Hoppe Boulder County Assessor’s Office
GIS Department Boulder, Colorado
Overview • Boulder County • Assessor’s Office structure Data Mining • From the Assessor’s Database • Getting it into GIS
Focus on Residential Properties
GIS for Appraisal work • In the field • Capturing Attributes (valuation)
• Analysis & Modeling
Where we work
Geology.com
720 square miles One-third plains Two-thirds mountains 125,000 real properties 98,000 residential
Where we work
Diverse Landscape
Diverse Properties
Why is property Assessed • Basis for generating tax revenues for local services
Assessors Role • Identify and values property within the county in
accordance with state law • Equalize property values/ taxes distributed fairly
Re-valued every odd # year
How we work
Teams = Geographic Areas
Assessor’s GIS Department
Led by Cindy Braddock • 3 GIS Specialists • 3.5 GIS Techs Responsible for… A LOT!
Data Mining
Why and How • Requests for information
– Public, partners, other County departments
• Helps us improve quality of information • Understand what we’ve already got
– Right, Wrong, Inconsistent – Know what to fix
100’s of tables 1000’s of fields
Add tables Join on Key Field Set requirements/parameters
“Bubble” Maps
Permit Fieldwork • Status as of January 1st • Remodels, other high $ improvement adds
value • Generates tax revenue for our districts • New residential construction
– Vacant to residential changes assessment rate – Determined by existence of a foundation
Mountain Attributes Human Judgment: • View • Privacy • Access
Mountain Attributes GIS Terrain Analysis captured: • Topography • Aspect
Dick’s Views on Views
Field Data -> Excel Spreadsheets-> Mass Uploaded into Database
Examining Sales Ratios
Estimated Sales Price (ESP)/Time-Adjusted Sales Price • Any ratio between 0.95 and 1.05 is ‘acceptable’ • Sales ratios << 1.00 – UNDERVALUED ESP? • Sales ratios >> 1.00 – OVERVALUED ESP? • Cause: incorrect or missing property information?
Sales Ratio =
Planes, Trains & Automobiles…
Planes, Trains & Automobiles…
Actually… Power Lines, Towers, and Railroads
Planes, Trains & Automobiles…
…Automobiles (Traffic, really)
GIS Analysis
The Heartbreak of…
http://geology.com/articles/expansive-soil.shtml
2008
2008 - 2009
2008 - 2010
2008 - 2011
2008 - 2012
Thanks for attending! Any questions??
Adam Hoppe & Pete Coventry Boulder County Assessor’s Office
GIS Department Boulder, Colorado
Adam Hoppe – ahoppe@bouldercounty.org Pete Coventry – pcoventry@bouldercounty.org
Geographic Areas = 5 Models
Sales Ratio = 1.6
• Sold for $514,000 • TMADJ SP = $513,000 • ESP = $800,000 • Overvalued ESP • Time for review
Sales Ratio = 0.81
• Sold for $675,000 • TMADJ SP = $660,000 • ESP = $540,000 • Underestimated ESP • Appraiser will review property attributes to determine if incorrect or missing
Coming Soon…
Bye, bye ArcReader Hello ArcGISExplorer • More bells and whistles and flexibility for the
users (appraisers) • Much Faster • More customization on the front end which
helps deliver more useful maps • More programming… C#
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