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Results

The table below shows the difference between the control coordinates and the coordinates derived by each site transformation method.

Point ID

One-step

Two-step

Classic-3D

Easting

Northing

Easting

Northing

Easting

Northing

PM51311

-0.0056

0.0205

-0.0056

0.0205

-0.0066

0.0211

SS35647

0.0021

-0.0137

0.0021

-0.0137

0.0025

-0.0147

PM50063

0.0093

-0.0165

0.0093

-0.0165

0.0100

-0.0158

SS75016

0.0031

-0.0084

0.0031

-0.0084

0.0034

-0.0099

SS36313

-0.0090

0.0181

-0.0090

0.0181

-0.0095

0.0193

 Table 2: The differences between the given and the derived coordinates (metres)

 

There are no differences in the one-step and two-step transformations. Since the survey site is only about 2km by 2km there are no distortions as a result of using the temporary projection utilised in the one-step transformation. There are only small differences (the maximum difference is 1.5mm) between the one-step and classic 3D transformations with the one-step transformation proving to be slightly better than the classic 3D transformation. This shows that when using GNSS in a small survey area fewer parameters are needed to change the WGS84 coordinates into the local coordinate system.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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