Do you know how to get the value of the nodata of a geotiff image?
Thanks
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Open the raster in the data inspector or universal viewer, drag a box with the mouse, that should prvide you with the properties of the raster including the no data value per band.
you could also use the RasterBandPropertiesExtractor. If there is a NoData Value per Band it will be presented. Moreover you can use the NoData Value as an attribute, to work with that.