GPS General Information
The GPS uses the US and Russion satellites (Glomass satellites). Once the base is set on a known point. The rover is accurate to +- 1cm horizontal, +-2cm vertical with a 2 mile range.
You can set the point using https://ngs.noaa.gov click on opus. It takes two hours to have the GPS gather data for a fixed point. You need to do this right away! When you document how to do this, put it on it's own page.
Data collector state
- Autonomous – NOT GOOD, means not connected.
- Float – Signal is there, but not real time or not in phase. Wait, it should correct itself
- Fixed – You're good
When you start up the system you should check PDOP (Pseudo Dilution of Precision) PDOP is related to satellite geometry. Close together → PDOP increases. Under 6 is good.
To access help go to Hayeshelp.com, User=trial, pass=topcon
N/E/E → Northerning, Easting, Elevation
Tennessee 4100 Network is apparently our local grid.
Projection types
State Plane
- WSG84 Lat/Long (Tennessee) (No Tran)
- NAVD88
- Localization ===
- One Point Setup
Localization
This is when you take several points and tack your local points to geodetic. Three is the bare minimum, and 4 is really necessary.
One Point Setup
This is when you will use the geodetic setup. You have one point that is defined (a latitude longitude marker). You get one point and you are ready to go. Either that or you just pick a point and use point relative to that one. It will have a Lat/Lng, but it may not be correct.