Building attribute table from raster in ArcMap 10.1

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I have a NetCDF file containing the latitude, longitude and porosity for the entire US. I am trying to add another value (wilting point) which depends on the porosity.I wanted to extract the netcdf to a table, add a new field and then use the field calculator to to fill the values on the new field. But when I import it, I only get one set of values on the table.I tried approaching it the other way: extracting the NetCDF to raster (which works fine) and extracting the values from the raster using "build raster attribute table" but i get an error message saying "Only single band integer raster dataset is a valid input". it doesn't make sense as the raster is a single band raster (I double checked the properties> number of bands of the raster). HOw can I build a table containing all the entries in the NetCDF file?

Thank you for your help.



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