Utah SGID: Parcel Layer Activities Update (UGIC 2011)

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Rick Kelson's slides describing the efforts to compile a statewide parcel GIS data layer in Utah. A subset of the broader Building the Utah Cadastre Through Partnerships presentation given by AGRC's …

Rick Kelson's slides describing the efforts to compile a statewide parcel GIS data layer in Utah. A subset of the broader Building the Utah Cadastre Through Partnerships presentation given by AGRC's cadastral group at the annual UGIC Conference in Logan (April 2011).

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  • 1. Utah Parcels Rick Kelson AGRC [email_address]
  • 2. AGRC now has parcel data from all 29 counties !
    • Some counties submit the entire countywide parcel dataset while others only submit the private land parcels
    • Some counties have come a long way in the last couple of years but others still have quite a bit of work ahead:
      • Adding new parcels
      • Subdividing parcels
      • Attributing parcels
      • Tying parcels to new section corners
    1,369,876 Total Parcels
  • 3. Parcel Accuracy
    • Counties maintain their parcel datasets differently:
      • From COGO description
      • ’ Pretty Picture’ GIS representation
      • Sometimes both
  • 4. Parcel Attributes
    • These are the only seven attributes we distribute with the parcel data
    • Using PARCEL_ID we can ‘Join’ the parcel layer to the county tax roll and populate other fields if they are not already in the parcel data
    • Thoughts of adding more attributes to the parcel schema:
      • SERIAL_NUM in addition to PARCEL_ID
      • UNIQUE_ID that could be a combination of PARCEL_ID and county FIPs code
  • 5.
    • Private Land Ownership
    • BLM Land
    • State Trust Lands
    • National Forest Land
    • Incorporated City Property
    • Federal Land Ownership
    • County Property
    • State Land (non SITLA)
    • Other
    • Vacant
    • Unknown
    • any combination of numbers between 1 to 999
    Currently ownership type information comes from the counties populated with any number of different attributes including: But most of the time it is blank or nonexistent
    • F
    • T
    • BTF
    • NTF
    • SAF
    • SAT
    • Common Area
    • State of Utah
    • Park
    • Pit
    • County
    • Government
    • USA
    • Subdiv
    • IR
    • Mineral
    • NPS
    • ROW
    • ROW
    • Rec
    • USFWS
  • 6. Parcel Attributes The OWN_TYPE field is populated using a ‘spatial join’ with the SGID Land Ownership’s very generalized OWNER attribute field
    • Federal
    • Private
    • State
    • Tribal
    Unfortunately this process does not meet everyone's needs and must be revised
    • SITLA-BLM need the attribute populated by the county so they can use it to check and quality control the Land Ownership dataset they produce
      • The discrepancies between the counties and Land Ownership can greatly affect the current tax revenue flowing in and out of the counties, currently and in the future.
      • The discrepancies also effect the accuracy of land available for sale through land swaps and further affect the tax revenue in the county.
      • Other decision making issues
  • 7. Utah Parcel Viewer and Download Application
  • 8. Utah Parcel Viewer and Download Application
  • 9. Utah Parcel Viewer and Download Application
  • 10. Utah Parcel Viewer and Download Application
  • 11. Utah Parcel Viewer and Download Application
  • 12. Custom County Parcel Viewer Application <!-- CUSTOM PARCEL VIEWER, specify county id and size --> <div id='agrcParcelViewer' dojoType='agrc.widgets.viewer.ParcelViewer' county_num= '13' style='width: 800px; height: 500px;'></div> <!-- SCRIPT TAG TO LOAD CUSTOM DIJIT --> <script type='text/javascript' src=' http://dagrc.utah.gov/widgets/dojo/agrc/widgets/viewer/ParcelViewerLoader.js '></script>
  • 13. Custom County Parcel Viewer Application
  • 14. Custom County Parcel Viewer Application
  • 15. Custom County Parcel Viewer Application
  • 16. Custom County Parcel Viewer Application
  • 17. Address Points Derived From Parcels
    • Recently there has been a large push to create a statewide database of address points
      • Collecting GPS points or digitizing points would be very time consuming and painful if not impossible
    • Luckily there are many existing data resources from which to get started:
      • Tables of know addresses
      • Street center lines with address ranges
      • Parcels that carry addresses
  • 18. Address Points Derived From Parcels
    • Converting parcels to address points presents several hurdles:
      • Many parcels can share the same address
      • A parcel can contain several addresses
      • Some parcels do not have an address and never will
      • The centroid is easy to get for a parcel but ideally the address point is the primary building OR at a frontage point near the address's primary access point to the road network
  • 19. Address Points Derived From Parcels
    • Bert Granberg from the AGRC has developed some VBA code that attempts to convert a set of merged ‘Address Polygon’ derived from the parcels into address points. The code:
        • Takes the existing parcel polygons from the SGID
        • Merges together adjacent polygons with the same address
        • Generates address points
        • Positions address points close to the street with the same address and street name
  • 20. Address Points Derived From Parcels Raw parcels
  • 21. Address Points Derived From Parcels Address Polygons (shown in red, gray lines indicate parcel boundaries that were removed)
  • 22. Address Points Derived From Parcels Address Points (frontage style)
  • 23. Questions ? Rick Kelson AGRC [email_address]