Hello @richardtriesfme,

You can use a Clipper and an AreaCalculator to do this in FME.

If you have some test data then I can give you an example. (please provide the FME version you use also)

Best regards,

Wilko Stalknecht

Hi @richardtriesfme, the @stalknecht gave you the correct names of transformers that you can use: Clipper and AreaCalculator.

If your source data is a raster and you would like to get the quantity of pixel: blue, green and red you can use the transformer RasterCellCoercer to extract vectors from raster and calculate the percentagem.

Thanks,

Danilo