Cogo calculations
To calculate distances, azimuths, point positions and other coordinate geometry (cogo) functions by various methods use the options in the Cogo menu.
You can store the results of cogo functions in the job.
The Snap‑to toolbar provides a simple way to select locations on objects in the map by snapping onto a specific point, even if no point exists. For example, you can use the Snap‑to toolbar to accurately select the end point of a line or the center of an arc from linework in a map file, such as an IFC or DXF file. If a point does not already exist at the selected location, Trimble Access calculates a point. See Snap‑to toolbar.
When a scan point measured using a Trimble SX10 or SX12 scanning total station is used in a cogo calculation, a point is created in the job at the same position as the scan point.
Coordinate systems for cogo calculations
When storing points calculated from cogo functions, tap Options and use the Coordinate view field to specify if the calculated point is to be stored as Global, Local or Grid coordinate values. See Coordinate view settings.
For some calculations, you must define a projection, or select a Scale factor‑only coordinate system. If the points were measured using GNSS, the coordinates of the point can only be displayed as grid values if a projection and a datum transformation are defined.
In general, do not compute points and then change the coordinate system or perform a calibration. If you do, these points will be inconsistent with the new coordinate system. An exception to this is points computed using the Brng‑dist from a point method.
Calculating distances
To change whether distances are displayed and calculated with reference to the ellipsoid, or to grid or ground coordinates, tap Options and change the selection in the Distances field.
If you are connected to a laser rangefinder, you can use it to measure distances or offsets. See To measure points using a laser rangefinder.
