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Subtract Elevation Values to New Field (Field Calculator)

Question asked by maccettulla on Dec 3, 2014
Latest reply on Feb 16, 2015 by dkwiens

I have a data set of cross section lines (station lines).  Each cross section has two intersection points, where the cross section intersects a flood zone boundary.  I have extracted elevation values to these intersection points, based on a DEM.  I created a new field called "ElevDiff."  Is anybody aware of an expression/function I could put into the Field Calculator that would allow me to calculate the difference in elevation between the two intersection points for each cross section?   


I know I could do this in excel (absolute value of one cell minus another), but there are 14,000 cross sections, so I was trying to use model builder to automate the process (this is just one step in a complex flood zone analysis) so I wouldn't have to export anything to excel and then create more joins.