My office is relatively new to the GPS marketplace and so we are trying to determine an appropriate field procedure for GPS work. We are currently using Topcon Hiper V equipment, and use Carlson SurvCE in our mini and Carlson Survey for drafting. Currently, we are starting a procedure where upon arrive on the job site we will set two control points using a MiFi and connected to our state plane coordinates. We then determine we will set up a Base Receiver over one of those coordinates and configure using the point number. We can then double check the coordinates for the second control point for tolerance acceptance, and any other control we have on the property.
We will then continue around the property and shoot in corners, roads, etc.
Does this seem appropriate, and will this procedure, once processed and adjusted using the SurvNET program in Carlson, keep our coordinates in state plane coordinates? In the past we have set up using Read GPS (unknown points), and then localized on the MiFi/State Plane points. When doing this, after the adjustment process, if we returned and shot only using the Rover and not setting up and localizing, the points would differ by around 6-15 feet (it is my understanding this is because we did not set the Base over a known State Plane point).
Thank you for all your help and suggestions.
Do you know what bearings you are on?
Are you applying theta, or not?
I've used Carlson data collector before. As I remember, you have an option to use state plane grid, or ground. Are you using either of those?
I used to use ground, THEN apply theta. To get Grid brngs, ground scale, at the base.
In an attempt to make field crew feel like kings, some of the calculations are hidden. This has the bad effect of hiding important metadata.
I've not used Carlson in years, so I'd hazard a guess that it has changed some... But I don't know for sure.
I've migrated to Javad, and it gives me metadata, as I like.
Run least squares by any chance?
Doesn't the least squares report tell you what measurement is in conflict with the rest to give such a discrepancy?
Depending on where you are relative to your state plane zone, the discrepancy could be which kind of foot is selected?