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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.
Thank 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.
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