Wisconsin Land Survey NetworkPresentation Transcript
Wisconsin Land Survey Network A Statewide (geospatial dataset) Representation of the PLSS www.sco.wisc.edu
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
Coordinate Accuracy 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
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
PLSSFinder Timothy Kennedy Program Specialist 608-890-3793 firstname.lastname@example.orgWHAIFinder Brenda Hemstead Data Services Professional 608-263-4371 email@example.com ControlFinder www.sco.wisc.edu