Hi I'm a student learning Civil 3D and Surveying, I am in the UK.

I have a query.

I have performed a basic RTK-VRS survey of a property for training and downloaded a OS MasterMap and overlayed it  in Civil 3D. The GPRS measurements do not line up with the boundries indicated on the OS MasterMap.

However the measurements on the CAD drawing match the GPRS measurement on the ground.

I'd like to confirm that I'm using the correct Coordinate settings in the TSC3 I have. I've taken some screen shots of the setting and would appreciate if you can confirm these are correct or not. This will allow me to discount this area as being at fault.

I've added a screen shot of the overlay problem I have as well

I'd really appreciate some help, thanks

Ian

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It could be that the master map is wrong. Almost looks to close to be your settings.

Cheers Jon, I am coming to that conclusion now. But didn't have any previous experience of the mapping.

Check whether coordinate system is wgs84.
And also use trimble business centre

Hi , Yes I am using wgs84 but I'm training on Civil 3D.

Thanks

Hi Ian, never rely on the os mapping... It's great for general use but in places it can be a couple of meters out.
It's partly responsible for all the boundary surveys that we get involved with!

Thanks Paul

i agree with you Paul..just like google earth its not spot on

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