GPS Best Practices For Professional Surveyors KAPS Fall Seminar - - PowerPoint PPT Presentation
GPS Best Practices For Professional Surveyors KAPS Fall Seminar November 22, 2019 Introductions About me Learning Objective Provide an open forum for discussing the best practices for utilizing GPS technology in surveying.
KAPS Fall Seminar November 22, 2019
practices for utilizing GPS technology in surveying.
Discussion on GPS surveying styles Planning your survey Observing points Case Study – utilizing GPS styles and total stations on a boundary survey Postprocessing overview
NGS Data Sheets
NGS Interactive Map
City/County Control Marks
reduce vertical errors
Asked to perform a boundary survey on 3 Parcels totaling 108 acres.
Research found an existing survey calling
corners. Section corner to the north Want to utilize GPS vs running a closed traverse around the 3 parcels.
What it looks like in the field Approach: Utilize VRS Utilize OPUS Utilize RTK Utilize robotic total stations
Set control points and observe utilizing a VRS Network
Make redundant
control points
Set base station
points and log data While base station is logging data, locate found monumentation (RTK)
Submit base station data off to OPUS for processing
Submit base station data off to OPUS for processing
Submit base station data off to OPUS for processing
Submit base station data off to OPUS for processing
Inverse from VRS to OPUS results
Ways to improve vertical??
Ways to improve vertical??
Ways to improve vertical?? VRS another control point OPUS another control point
Setup base station on control point and observe
& monuments
Start building redundancy in GPS network. Move base station to other control points and re-observe
points
Start building redundancy in GPS network. Move base station to other control points and re-observe
points
Supplement GPS with total station work in non-friendly GPS locations Build in redundancy (#11 & #14)
Set control with GPS Supplement control with total station data
Non-friendly GPS environment
Another example
total station with GPS Build in redundancy
Perform a least squares adjustment on your network
Horizontal datum - U.S. State Plane, NAD83, [Ohio South (3402)] Zone established from utilizing the Ohio Virtual Reference station provided by the Ohio Department of Transportation. State Plane Coordinates were taken to ground at Latitude [N39°02'49.15063"], [Longitude W84°19'02.50694"], Project Height [height], Ground scale factor [number]. Horizontal datum - U.S. State PLANE, NAD83, [Ohio South (3402)] Zone established from a static observation and post processed utilizing NGS OPUS Solution using base stations [base]; [base]; [base]. State Plane Coordinates were taken to ground at Latitude [N39°02'49.15063"], [Longitude W84°19'02.50694"], Project Height [height], Ground scale factor [number].