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GDA2020 gotchas - Australian Datum shift

  • June 9, 2020
  • 2 replies
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darkspatiallord
Contributor
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Hi All

A few learned gotchas in regards to GDA2020 transformations.

- Dont use the Navigator to convert datums GDA94 > GDA2020 as it defaults to 7 param (unless thats what you want)

- Reprojector Transformer is seemingly default to 7Param when it should default to gridshift (have a call logged with Safe)

- CSMapReprojector - if you are using Desktop this is the best to use as you can force the transformation from the dropdown

However if you are going to server and you want the user to select the output coordinate system which may or may not include a transformation you need to automate which method you use by setting it with either a parameter or a conditional value based on the selected coordinate system code

 

Lots of fun to be had but some caution as well. No transformation is the same.

virtualcitymatt
sandanuwan
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2 replies

sandanuwan
Contributor
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  • sandanuwanContributor
  • Contributor
  • December 15, 2024

Thank you for sharing the gotchas. When using “CSMapReprojector” any specific things to be cautious about? 

philipwhitten
Supporter
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  • philipwhittenSupporter
  • Supporter
  • December 16, 2024

I want to add, if going from GDA2020 to web mercator (EPSG 3857) newer versions of FME will automatically reproject to GDA94 unless you are explicit that you don’t want it reprojected.

sandanuwan

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