I have a four band raster (geotiff) that I need to use to create an NDVI.
Basically I need to do the following maths on every cell of the raster:
(Band4 - Band1) / (Band4 + Band1)
How do I do this with FME? I can't seem to figure out the whole "cell calculator" thing it has going on.
There's a FME case study (http://blog.safe.com/2013/09/a-perfect-pairing-fme-and-rapideye-imagery-in-la-rioja-spain/) which mentions using FME to create an NDVI but doesn't show how that part was done. :-/
Thoughts welcome.
Thanks!
Jonathan