I have created lines between multiple points that are across MGA 54 and 55S (EPSG 28355). I am trying to calculate the distance between points but different methods give different answers (~1km difference).
All data is in GDA94 (EPSG 4283 as it en composes both projections)
- ArcGIS - !Shape.length@meters! gives 467.799 (based on http://blogs.esri.com/esri/arcgis/2011/07/21/calculating_geodesic/)
- Xtools - Gives 468.627Km
- OziExplorer - gives 466.310Km (Great Circle) and 466.319Km (Rhumb Line)
- Spider (arcgis) tool - 4.401 (DGMS) http://resources.arcgis.com/gallery/file/geoprocessing/details?entryID=1C1927D6-1422-2418-8809-3BA43CBD435C
If anyone wants to try the two test points are
Normanton PO -17.669563 141.079541 to Mareeba site (off Kirrakoppa Rd) 145.417391 -16.999263
What is the most accurate method? if any.
Source question for background is Draw line between points from multiple datasets