Getting it Done
Using GIS to Help Appraisal Staff Rapidly Update
and Improve Property Data

Pete Coventry, Adam Hoppe
Boul...
Overview
• Boulder County
• Assessor’s Office structure
Data Mining
• From the Assessor’s Database
• Getting it into GIS

...
GIS for Appraisal work
• In the field
• Capturing Attributes (valuation)
•

Analysis & Modeling
Where we work

Geology.com
Where we work
720 square miles
One-third plains
Two-thirds mountains
125,000 real properties
98,000 residential
Diverse Landscape
Diverse Properties
How we work
Why is property Assessed
• Basis for generating tax revenues for local services

Assessors Role
• Identify and...
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 qual...
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 ou...
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
Sales Ratio =
Estimated Sales Price (ESP)/Time-Adjusted Sales Price
• Any ratio between 0.95 and 1....
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 – ahoppe@bouldercounty.org
Pete Coventry – pcoventry@bouldercounty.org

A...
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 revie...
Coming Soon…
Bye, bye ArcReader
Hello ArcGISExplorer
• More bells and whistles and flexibility for the
users (appraisers)
...
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe
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2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe

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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.

Published in: Technology, Education
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2013 GISCO Track, Using GIS to Help Appraisal Staff Value Property by Pete Coventry and Adam Hoppe

  1. 1. 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
  2. 2. Overview • Boulder County • Assessor’s Office structure Data Mining • From the Assessor’s Database • Getting it into GIS Focus on Residential Properties
  3. 3. GIS for Appraisal work • In the field • Capturing Attributes (valuation) • Analysis & Modeling
  4. 4. Where we work Geology.com
  5. 5. Where we work 720 square miles One-third plains Two-thirds mountains 125,000 real properties 98,000 residential
  6. 6. Diverse Landscape
  7. 7. Diverse Properties
  8. 8. How we work 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
  9. 9. Teams = Geographic Areas
  10. 10. Assessor’s GIS Department Led by Cindy Braddock • 3 GIS Specialists • 3.5 GIS Techs Responsible for… A LOT!
  11. 11. 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
  12. 12. 100’s of tables 1000’s of fields
  13. 13. Add tables Join on Key Field Set requirements/parameters
  14. 14. “Bubble” Maps
  15. 15. 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
  16. 16. Mountain Attributes Human Judgment: • View • Privacy • Access
  17. 17. Mountain Attributes GIS Terrain Analysis captured: • Topography • Aspect
  18. 18. Dick’s Views on Views
  19. 19. Field Data -> Excel Spreadsheets-> Mass Uploaded into Database
  20. 20. Examining Sales Ratios Sales Ratio = 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?
  21. 21. Planes, Trains & Automobiles…
  22. 22. Planes, Trains & Automobiles… Actually… Power Lines, Towers, and Railroads
  23. 23. Planes, Trains & Automobiles…
  24. 24. …Automobiles (Traffic, really)
  25. 25. GIS Analysis
  26. 26. The Heartbreak of…
  27. 27. http://geology.com/articles/expansive-soil.shtml
  28. 28. 2008
  29. 29. 2008 - 2009
  30. 30. 2008 - 2010
  31. 31. 2008 - 2011
  32. 32. 2008 - 2012
  33. 33. Thanks for attending! Any questions?? Adam Hoppe – ahoppe@bouldercounty.org Pete Coventry – pcoventry@bouldercounty.org Adam Hoppe & Pete Coventry Boulder County Assessor’s Office GIS Department Boulder, Colorado
  34. 34. Geographic Areas = 5 Models
  35. 35. Sales Ratio = 1.6 • • • • • Sold for $514,000 TMADJ SP = $513,000 ESP = $800,000 Overvalued ESP Time for review
  36. 36. 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
  37. 37. 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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