wisconsin land survey network
TRANSCRIPT
Wisconsin Land Survey Network
www.sco.wisc.edu
A Statewide (geospatial dataset) Representation of the PLSS
Public Land Survey System (PLSS)
Rectangular grid system of land
description used in Wisconsin:
original survey commenced – 1830’s
Land is described by location from a
principal meridian and baseline.
Further division of land into
townships, sections, quarter
sections, quarter-quarter sections.
DNR Landnet
WDNR, 1990s
Derived from USGS 24K topos
Statewide inventory of PLSS features
Framework for representing WDNR-
managed lands
Linkage to survey-level data
County PLSS data
is available!
Coordinate Accuracy
Section Corner Comparison:Landnet vs. Outagamie County
740 points used in accuracy analysis
Mean distance between Landnet and county corner points: 8.93 m
Maximum distance: 84.90 m
Minimum distance: 0.19 m
Coordinate Accuracy
SCO Project Goals & Objectives
Create an improved dataset of statewide PLSS data
Improved coordinates in participating counties
Integration of Landnet where local data unavailable
Replicable data model for statewide data integration
Broad access to data
Simple update and maintenance process
SCO Project Requirements
NAD83 (1991)
Store multiple coordinate values per corner point
Select one corner point for map display
Preserve Landnet coordinates and IDs (backwards compatibility to Landnet)
Accommodate third-level PLSS subdivision (quarter-quarter)
Requirements (cont.)
Persistent point contact information
Multiple URL storage per point
Topological consistency
Storage of external metadata
Highly portable deliverables
Forward compatibility to national standard
SCO Project Expectations Phase I:
Pilot study using 9 counties Solicit partners and support Finalize data model and data integration procedures Geodatabase of study counties PLSS data
Phase II: Statewide coverage (non-PLSS areas – long lots,
metes & bounds, etc.) Distribution network (web-mapping application,
download)
Pilot Project Study Area
Varied status of remonumentation
Abundance of diverse meander features
Non-PLSS data
Data availability
What’s in it for you? Updated dataset of PLSS points and polygons in
Wisconsin
PLSS points with greater accuracy where county data available
Robust metadata from county sources
Multiple delivery methods (geodatabase, shapefiles, GPS, KML, web-mapping application)
Regular update cycle
Why Are We Here?
Your chance to provide comments, critiques, suggestions
How would this dataset benefit you?
Brief online survey
Timothy KennedyProgram Specialist
Brenda HemsteadData Services Professional
ControlFinder
WHAIFinder
PLSSFinder
www.sco.wisc.edu