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I have bathymetric data extracted from INFOMAR ArcGIS grids.

Based on the data I am wondering if the fill, flow direction and flow accumulation tools work with negative elevations or if I have to use the raster calculator to change them to values lying above the sea level.

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I think that you will have no problem with negative values. I remember that I used these tools for the Jordan River Basin where we had negative elevations wihtout problems. In addition, if you reverse the numbers you will have false result.

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  • You can always raise Dem to make all values positive.
    – FelixIP
    Commented Jan 12, 2019 at 0:35

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