Product(s):	OpenRoads, OpenRail, OpenSite
Version(s):	10.00+
Area:	Survey

 

Question:

What is a Control Point? How is this different than a stored point record in my survey?

 

Answer:

The OpenRoads Survey program considers the Control Points as fixed/monument/GPS points that will stay fixed during import or adjustment. 

For example, if a user creates a setup in the field by using assumed coordinates, these stored point coordinates will be replaced by the Control Point coordinates of the same point name when the raw data is imported.   The adjustment reports would show the difference between the stored coordinates and the control point coordinates.  

In addition to setting point coordinates during import, Control Points are also necessary to run Adjustments in order to specify which points are fixed and will not be adjusted.

To automatically import fixed points as Control Points, go to OpenRoads Standards in the Explorer and edit the Survey Settings>Points>Import Coordinate Records = "As Control".

As Control - imports fixed point records and automatically sets them as Controls Points so that the coordinates do not change based on the observation/adjustment of these points.
As Control by Field Code - imports fixed point records whose Filed Code is contained in the "Control Point Features"  list and automatically sets them as Controls Points so that the coordinates do not change based on the observation/adjustment of these points.
Always - imports fixed points records, but does not set them as Control Points.  Therefore, coordinates of these points may be updated based on observations and/or adjustments.
Never - fixed point records are not imported.