Question
Is there a transformer to directly contour a raster file (geotiff format). Which also does not contour on empty raster cells?
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+1Thank you for your suggestions. I tried the contourgenerator transformer. But this transformer creates contours over the area with nodata, which I don't want (see below image). Maybe I am doing something wrong, but I don't see the option to create a contour with the rastercellcoercer.
+31- Influencer
You can create a polygon that covers the extents of the raster data using the RasterExtentsCoercer set to Data Extents mode. Then, use the Clipper to clip the contours to the polygon.
+1Thank you cartoscro. Your transformers work. The only problem I have is that they don't work for large raster files. 4.2 Mb works, 3.5Gb doesn't.
+31- Influencer
3.5gb is a large file. Try the workflow below. Splitting the data into chunks may help it to run a little faster. This splits the raster into 4 datasets, but you may need to increase this number.
tiled-raster.jpg