I have data in an XYZ format (saved as a .txt file) that I am importing into ArcGIS and then converting to a raster using the point to raster conversion. However, the Z field in the data represents a depth below the sea surface, but has been output as a positive value by the source software. In order to plot this correctly in ArcGIS is there a simple way to convert these values to negative values or to plot them as subsea? The table contains almost 40,000,000 rows so I cannot do the conversion in a text editor. I have tried using the Field Calculator function in the table, however this option is grayed out?
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