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Reprojection issue from LL-GDA94 to GDA2020 zone 56

  • February 21, 2025
  • 2 replies
  • 48 views

salgardi
Contributor
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Hi all,

I hope to get a few hints in the following issue.

Issue - Unable to reproject the dataset into GDA2020 zone 56

Dataset URL - The dataset is displayed in the form of WFS

Dataset Coordinate system - LL-GDA94

Dataset EPSG - 4293

I have used different transformers to place the dataset in the right location with no success.

I think the issue lies in using the right transformers so any hints would be greatly appreciated.

Thank you very much in advance,

Sebastian.

 

 

2 replies

bwn
Evangelist
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  • Evangelist
  • February 21, 2025

Reprojector has worked for us virtually every time to translate GDA94 Lat/Long (EPSG:4283)  to GDA2020 Zone 56 Projection (EPSG: 7856).

I suspect your real issue though, is the WFS Reader is returning Latitude as the “X” Coordinate, and Longitude as the “Y” Coordinate, which is the wrong way around.   I can’t say whether that is a WFS configuration error on the ESRI REST API or an FME configuration error, but there is a workaround by using CoordinateSwapper (although there may be a Reader setting to do this, just couldn’t see it immediately).

 

Using this with the REST Service seems to give correct GDA2020 Zone 56 coords.



Edit:  OK, reading the FME manual a bit closer.

Can avoid the CoordinateSwapper above by instead configuring the WFS Reader Parameters, although I’m still not sure why FME doesn’t quite auto-detect.  It seems to think the WFS service will serve the coordinates in one order versus what the WFS service actually outputs.

WFS URL is:
https://mapprod3.environment.nsw.gov.au/arcgis/services/Planning/SEPP_Housing_2021/MapServer/WFSServer?request=GetCapabilities&service=WFS

 

Manual config to get FME to return Long = X and Lat = Y.

 

 


salgardi
Contributor
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  • Author
  • Contributor
  • February 25, 2025

Hi Evangelist,

Thank very much for your help it really helped me to solve this issue.

For others who may be interested in knowing the solution provided by the Evangelist.

Here is:

  1. Connected to the URL (WFS). Made the manual configuration as per ​@bwn.
  2. Used the Reprojector and set it up as per ​@bwn.
  3. Wrote to the SQL DB.
  4. URL data (blue polygon) right in place.

Sebastian.

 

 


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