Geodetic Calculation Methods

Online calculations and downloadable spreadsheets to perform geodetic calculations

Detailed information about the spreadsheets and formulae used in all calculations listed below can be found in the Geocentric Datum of Australia Technical Manual External site link.

Note: Read the documentation describing the distance calculation algorithms to decide which method best suits your requirements.

Distance calculations

Calculate Great Circle distances using latitude and longitude.

Calculate bearing and distance from latitude and longitude

Use Vincenty's formulae to calculate distance and bearing from latitude and longitude and vice versa.

Convert from latitude and longitude to UTM coordinates

Use Redfearn's formulae to convert between latitude and longitude and UTM coordinates and vice versa.

Transformation of coordinates

The following are available for download but are not yet available as online calculations.

  • Low Accuracy Block Shift
    • Low Accuracy Block Shift [XLS 360KB] for average size of the block shifts between AGD66 and AGD84 and GDA94, computed for 1:250 000 topographic map areas across Australia.

Topic contact: geodesy@ga.gov.au Last updated: May 8, 2013