Skip to main content
Question

ECW Header information

  • March 3, 2025
  • 1 reply
  • 20 views

bwhite
Contributor
Forum|alt.badge.img+2

HI, I have a problem to solve where I need to extract the coordinate system within the header information of the ECW image (not the sidecar files).  Our internal systems only work when the ECW header has “EPSG:7855” as the coordinate system, and I need to identify images that sometimes possess “GDA2020” & “Zone 55” information (as shown below).  The software “ECW Header Editor” can distinguish between the two, but FME seems to use the two values interchangeably, so my workbench can’t identify potentially problematic images.  The FME output for both “EPSG:7855” and the below entries are always “MGA2020-55_FME”.  Is there any way for FME to identify the below values hidden inside an ECW header?

 

1 reply

ctredinnick
Supporter
Forum|alt.badge.img+18
  • Supporter
  • March 3, 2025

If FME is reading two differently labelled coordinate systems as the same thing, then that’s not ideal. Maybe try CoordinateSystemExtractor then CoordinateSystemDescriptionConverter on the two files with different coordinate systems to confirm if they are actually read as identical.

If you can’t trust the ecw reader, then last resort would be to figure out the file encoding and read the header/first line of the ECW file as text, and try find “EPSG:7855” in it.


Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings