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Question

PROJ4 reprojection

redgeographics
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I'm trying to get my head around this: I've been given a png image in a polar stereographic projection, a set of coordinates of its extents in LL84 and this PROJ4 string:

+proj=stere +lat_0=90 +lat_ts=60 +lon_0=10 +a=6370040 +b=6370040
+no_defs +y_0=3609144.7242655749 +x_0=542962.16692185635

And the challenge to georeference the image. Problem is I can't use the RasterGeoreferencer with the extents because in LL84 they don't form a rectangle. Any other pure-FME solutions I can try?

 

 

2 replies

david_r
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  • david_rCelebrity
  • December 9, 2021

The AffineWarper, maybe?

redgeographics
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  • redgeographicsCelebrity
  • Author
  • Celebrity
  • December 9, 2021
david_r wrote:

The AffineWarper, maybe?

I don't have any control vectors, not even the projected coordinates of those extents, so I don't think that'd work.

 

I did have a reference map in that projection at the correct pixel dimensions and coverage, so I was able to outside of FME to play Projection Detective on that, match it with reference data and georeference it that way.

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