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How to add field for raster that doesn???t have an attribute table?

Question asked by Jamal432@gmail.com on Jun 3, 2012
Latest reply on Jun 4, 2012 by geonetadmin
How to add field for raster that doesn???t have an attribute table?

I???ve the raster that represent the rainfall and wanted to calculate the recharge. In order to do so, I need first to add field then to apply the ???if statement??? below:
-------------------------------------
if [Value] < 456 then
OP = .3 * [Value]
else
if [Value] >456 and [Value]  < 700 then
OP = .46*( [Value]  - 159)

else
if  [Value] > 700 then
OP = .36*([Value] -285)

end if
end if
end if
------------------------------------------
Then how to derive the recharge from the rainfall knowing that there is no attribute table for the rainfall?

[ATTACH=CONFIG]14892[/ATTACH], [ATTACH=CONFIG]14893[/ATTACH]

The raster is attached

Thank you for the help,

Best

Jamal

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