Least Squares Adjustment Method
Overview
The Survey Network Adjustment program uses the least-squares method of variation of coordinates to adjust a horizontal network.
The following observations are supported:
- Plane or spheroidal distances.
- Plane or grid bearings.
- Observed angles.
- Observed directions.
Up to 500 observations are allowed, with up to 50 fixed stations, and 250 free stations.
The adjustment can be performed on the plane, or on either of AMG or ISG grids (both based on the UTM or the Australian Geodetic Datum).
All lines observed in the network can be displayed graphically after the adjustment is run, allowing a quick overview of the structure of the network being adjusted.
Error ellipses for all free stations can also be calculated and displayed (at a user defined exaggeration to ensure visibility).
A least-squares adjustment of reduced levels based on elevation differences between stations is also supported. It must be noted that this is a totally separate adjustment from the horizontal network adjustment.
