You have to be more specific. What type of feature do you need to extract.

One way would be to use two RasterCellValueReplacers one for values <-1 and one for values >1 and replace them by some value that you set as NoData via RasterBandNodataSetter. -32768 is one of the commonly used values as it is the lowest 16bit signed integer.

You can then use RasterExtentsCoercer to get Data Extents in a polygon or just style the raster accordingly in your software of choice.

Or use RasterStatisticsCalculator to extract some other data that you might need.

Please specify your desired end result.