What strategies are available for the conversion of existing digital data?
To convert to GDA94 you must firstly know what coordinates system has been used for your existing data. You may then immediately convert all your data to GDA94, or convert on demand. Conversion of all data produces a consistent data set, but conversion on demand may minimise the amount of data to be converted. Whenever practicable, new data should be collected in terms of GDA94. Whatever strategy is adopted, data must be labelled with the coordinate reference, and if necessary the transformation model, used to derive it.
