I'm debating whether to purchase a subscription to a VRS network in Maryland. Working for a construction company we use Trimble SCS900 for our fieldwork and I am having problems getting a .DC file to work with the network. Does anyone else use a VRS with SCS900 and have a solution for me
> I'm debating whether to purchase a subscription to a VRS network in Maryland. Working for a construction company we use Trimble SCS900 for our fieldwork and I am having problems getting a .DC file to work with the network. Does anyone else use a VRS with SCS900 and have a solution for me
We run off the TxDoT network with no issues. What kind of problems are you seeing?
I am having problems getting a .DC file to work with the network
???
I don't know SCS, I use Access, but what's a DC file got to do with anything?
To use VRS you need two things:
1) An internet connection
2) An NTRIP definition; what Access calls a GNSS Contact
I would think that SCS would use something similar to the Survey Styles in Access. So you define your Rover Data Link as your Internet connection, and your data type as VRS (CMR). In your NTRIP provider you enter the IP address and port of the VRS provider and the username and password you've been assigned.
We had issues a few years ago when going between a site calibrated using the network and one calibrated using a base. Seems like if it was calibrated using the network we could set a base to work off of later on a point and all was good, but if it was calibrated using a base the .dc file didn't work with the network and needed to be calibrated with the network. I don't know how to explain it, but the virtual base threw a wrench in it.
For those who are going to ask why calibrate using the network corrections, the Trimble scs900 construction software forces you to calibrate every site in order to function.
The vrs system is sending corrections based on some datum probably some version of nad83 but I have no idea what system Maryland vrs would be in. Your base is sending corrections based on an autonomous LLH at the base point and therefore not in the correct datum. You can easily go from vrs to base and rover but you cannot go from base and rover to vrs (you can but it would take a bit of work).
If you use SCS900 you know that it requires a calibration to run. I have version 2.91 and built a .dc file using NAD-83>>>Maryland 1900 and geoid 09. Went out to the field and check in .04 by.04 horizontally to a localized point but was off 105.35' for elevation. Went to two other jobs with similiar results. All the jobs were designed with NAD 83. Any idea what I'm missing?
Don't think SCS900 plays well with a geoid. Try it without it. Machine files don't work with a geoid either. So our Trimble guy says.
