We have recently run into a problem with our Topcon Hiper V's when utilizing the Ohio VRS system. When using the VRS, we have found that our elevations are approximately 3.7' higher than the listed NAVD 88 elevations. We've run checks multiple times and compared the elevations to other surveyors, and everything seems to point towards the equipment.
Everything checks within the surveys themselves, as well as when we use RTK everything is fine. We only run into the issue when using the VRS. The issue also isn't isolated to a single base?ÿ / rover set. We've noticed it on multiple sets.
Has anyone else run into this before? Any suggestions as to how we can fix the problem?
Hey mate,
?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ Sounds very odd, the fact that it's only happening when VRS and not all the time makes me think there may be a setting that may need to be adjusted. Without being able to see whats happening on screen, I'd assume that a geoid file may be the culprit.
A good check for this would be to do some checks on a localized project using VRS and see if the error continues, if it doesn't then you can eliminate the equipment being the issue. Also, if the other surveyors are using the same type of controllers and field software try running your receivers with their controllers to see if the error continues.
What field software are you using?
Very common mistake. 3.7 ft is the difference between NAD83 and NAD83_NO_TRANS. You should always use the later with a Network GPS.?ÿ
We tried the NAD 83 and NAD 83_NO_TRANS and that solved the problem.
Thanks.
Great!