Hello FME-Community,
I’d like to classify raster data by using breakpoints and I want to adapt the RGB-Codes before the output. Maybe someone of the community here can help me.
Thank you so much. :)
Best regards!
Question
Classify raster data by breakpoints
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+18- Supporter
Hi @abu_de_bdlq_16 I think this article is a good starting point on how to use the RasterExpressionEvaluator to classify your rasters.
It would help if you could specify more on what you are actually trying to achieve.
+40- Contributor
You can use conditional values in a RasterExpressionEvaluator, but nesting several layers makes the expression very complicated.
Depending on your exact scenario, I might recommend using the RasterCellValueReplacer and paletes.
Hi @abu_de_bdlq_16, if the requirement is to classify the cells of a grayscale raster into five classes by four threshold values and replace cell values with specific colors associated to each class, this workflow might be helpful.
Notes:
- Modify the thresholds in the expression according to the actual demand.
- See the help on the RasterPaletteExtractor transformer to learn about the syntax for palette definitions.
upper: source raster, lower: result
