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Question

EPSG code not written in ECW header correctly

  • December 16, 2020
  • 1 reply
  • 19 views
nicholas
Contributor
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I am running FME(R) 2019.2.3.2 (20200320 - Build 19825 - WIN64)

I am trying to convert a cloud-optimised geotiff into an ecw image (v2)

The image has GDA2020 datum, MGA Zone 56 projection, which is EPSG: 7856

https://epsg.io/7856

 

The output ecw does not have the correct values for datum & projection in the header. I can use ERDAS Imagine to read the header values

This is the result from FME (as per attached image from_FME.png)

Datum EPSG: 1168

Projection Name SUTM56

EPSG Code 0

 

To compare, I used ERDAS Imagine to perform the same conversion and these are the header values (as per attached image from_Imagine.png)

Datum GDA2020

Projection Name Transverse Mercator

EPSG Code 7856

 

I would prefer to use FME as it does bulk translations well. But I need the header information to be correct. How to fix?

1 reply

1
Forum|alt.badge.img+1

hi @nicholas​ - just a thought, but I think FME is not recognising the coordinate system on your data as it is reporting it as EPSG 0. But it looks like EPSG:7856 is in the supported list of CRS/Coordinate system gallery. Have you tried specifying/setting the coordinate system parameter on your Reader and also your Writer rather than using the default <not set> where FME will determine it (but in your case I think FME is unable to determine it).

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