PLSS Control Points and Adjustments Meet-Up
The processes of gathering, managing, and integrating control points in the US Public Land Survey System (PLSS). Enhance your understanding of spatial adjustments, least squares analysis, and surprise results in survey control management. Learn about various control databases and tools for survey projects."
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Presentation Transcript
PLSS 5 - PLSS Control Points and Adjustments This is a fifth meet up in a series dedicated to the US Public Land Survey System (PLSS). Identifying control projects, gathering control using web facing tools, managing control points, and the bringing them into the fabric are just a few of the possible steps for a complete survey control management system. After the control is collected and documented, bring it into the fabric and apply it to the PLSS using least squares analysis and spatial adjustment techniques. And be prepared because the results can surprise you. Presenters: Nancy von Meyer and Maya Daurio
Control Points Control is any point of known coordinate value on a known monument or location Typically these are surveyed points such as line of sight or GPS survey Typically collected control is assembled and managed ahead of fabric adjustments or realignments Can be pseudo control established to confine or support a project
Control Databases Cadastral Subcommittee PLSS Project Team http://nationalcad.org/PLSSWorkgroup/PLSSWo rkgroup.html Multi-State Control Point Database http://ags.giscenter.isu.edu/flexviewers/mcpd/ Utah TURN (Utah reference network) http://gis.utah.gov/data/sgid-cadastre/turn-gps/
Parcel Control Bank Simplified control database Matches the parcel fabric domains Has a few added fields for tracking and classifying control Is one of many options to consider
Parcel Fabric Control The name filed must be a text field or the control will be assigned an auto number. The name field can not be edited after the data is imported The X,Y,Z of the control must match your fabric projection In most instances the auto match will find the correct point to associate
