Have anyone got rotated coordinate systems work with FME? See metadata below. If I just use the RasterGeoreferencer it does not rotate, and I do not have an angle for the Rotator...
Is there no way to define the coordinate system as a "rotated" one?
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NetCDF + rotated coordinate system (rlat, rlon)
+24- Supporter
Best answer by david_r
Let me guess, COSMO-data?
Funny you should ask, I've been wrangling with exactly this for a while now. The bad news is that this particular coordinate system isn't supported by FME, but there is a way to do it yourself, although it's a bit convoluted. I'll post some more info later today when I have the time.
- Best Answer
Let me guess, COSMO-data?
Funny you should ask, I've been wrangling with exactly this for a while now. The bad news is that this particular coordinate system isn't supported by FME, but there is a way to do it yourself, although it's a bit convoluted. I'll post some more info later today when I have the time.
+24- Supporter
Thats great! There is a solution over at: https://wiki.met.no/fimex/start - however it demands linux - so its not an option for the moment.
sigtill wrote:
Thats great! There is a solution over at: https://wiki.met.no/fimex/start - however it demands linux - so its not an option for the moment.
Here's a workspace that Dean Hintz from Safe developed to reproject a raster from rot.pol to lon/lat coordinates, hopefully it can give you some pointers.
rotatedspherical-3drotator-netcdf-v3.fmw
Just be aware that the rotated (south) pole is hardcoded at (10,-40) which might not be the exact parameters you want, so look out for those constants.
Also it's kind of a proof of concept, so I wouldn't trust the results too much without doing extensive testing on your side.
Alternatively, here's a small Python function I wrote that reprojects both ways between rot.pol and lon/lat with a custom pole position. It should be fairly easy to incorporate into a PythonCaller, look at the bottom 20 lines for some usage examples. Let me know if you have questions.
No guarantees given as it hasn't been fully tested yet...
+24- Supporter
Thank you David! I had a quick look at both - and it seems I need to get some hours of to see if I can fix it.I`ll let you know ASAP.
sigtill wrote:
Thank you David! I had a quick look at both - and it seems I need to get some hours of to see if I can fix it.I`ll let you know ASAP.
+24- Supporter
david_r wrote:
Yeah, it's surprisingly hard to work with these rotated pole projections. Let's hope Safe (paging @daleatsafe) can include official support in a future release, seems like this is an issue that will crop up fairly frequently.
sigtill wrote:
Off topic: I see you also can not use the @daleatsafe - mention - tag. I also have this annoying problem, so I cant notify anyone. I have tried 3 different computers, multiple web browsers and mobile. So it is a config-setting that Safe Software needs to tweek on the Answerhub-system. Same as mentioned here https://knowledge.safe.com/questions/40222/why.html
+17- Contributor
sigtill wrote:
Thank you David! I had a quick look at both - and it seems I need to get some hours of to see if I can fix it.I`ll let you know ASAP.
fmelizard wrote:
I've escalated both issues at Safe -- thanks for pointing them out (the coordinate system + the paging...)
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