Hello,
I'm new in FME and I want to put, in a polygon, the minimum value (from a raster) in this polygon inside this polygon.
I use :
"RasterToPolygonCoercer" to extract data,
"AreaOnAreaOverlayer" to transfert data to polygon.
But I cannot think how to do this.
+44Have you tried clipping the raster with the polygon, then using a rasterstatistics calculator on the resulting clipped raster to get the minimum?
+37@ebygomm has the right approach. You want to have a unique id on the polygons, if they don't already have one, you can use a Counter to create one. On the clipper, merge attributes. After the RasterStatisticsCalculator use a FeatureMerger/FeatureJoiner to join the band0.min value back to the original polygons based on the unique id.
+44@ebygomm has the right approach. You want to have a unique id on the polygons, if they don't already have one, you can use a Counter to create one. On the clipper, merge attributes. After the RasterStatisticsCalculator use a FeatureMerger/FeatureJoiner to join the band0.min value back to the original polygons based on the unique id.
I normally store the geomety as an attribute with a geometryextractor then rebuild after with a geometryreplacer. Feels a bit neater than the featuremerger.
+37I normally store the geomety as an attribute with a geometryextractor then rebuild after with a geometryreplacer. Feels a bit neater than the featuremerger.
That's an idea. I will need to do some performance tests to see which scenarios are better for which approach.
