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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 cadastral group at the annual UGIC Conference in Logan (April 2011).
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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
Parcel Accuracy
Counties maintain their parcel datasets differently:
From COGO description
’Pretty Picture’ GIS representation
Sometimes both
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
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
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
Utah Parcel Viewer and Download Application
Utah Parcel Viewer and Download Application
Utah Parcel Viewer and Download Application
Utah Parcel Viewer and Download Application
Utah Parcel Viewer and Download Application
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>
Custom County Parcel Viewer Application
Custom County Parcel Viewer Application
Custom County Parcel Viewer Application
Custom County Parcel Viewer Application
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
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
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
Address Points Derived From Parcels
Raw parcels
Address Points Derived From Parcels
Address Polygons (shown in red, gray lines indicate parcel boundaries that were removed)
Address Points Derived From Parcels
Address Points (frontage style)
