topic How to use caluclate field with &quot;null&quot;? in ModelBuilder Questions https://community.esri.com/t5/modelbuilder-questions/how-to-use-caluclate-field-with-quot-null-quot/m-p/823856#M1337 <HTML><HEAD></HEAD><BODY><P>I am trying to determine the total area that Polygon B covers in polygon A.&nbsp; The only downside is if Polygon C covers polygon B then I want that area removed from the total coverage area.&nbsp; I have managed to clip each B and C so that they fit in A but when I try and minus C from B it only works for the sites that have C, all of the other ones result in "null".&nbsp; I've tried using an&nbsp;if then else statements and it refuses to calculate anything then.&nbsp; Is there an easier way to cut area C out of B without the calculate field tool?</P></BODY></HTML> Fri, 05 Apr 2019 21:13:40 GMT ElizabethOtto 2019-04-05T21:13:40Z How to use caluclate field with "null"? https://community.esri.com/t5/modelbuilder-questions/how-to-use-caluclate-field-with-quot-null-quot/m-p/823856#M1337 <HTML><HEAD></HEAD><BODY><P>I am trying to determine the total area that Polygon B covers in polygon A.&nbsp; The only downside is if Polygon C covers polygon B then I want that area removed from the total coverage area.&nbsp; I have managed to clip each B and C so that they fit in A but when I try and minus C from B it only works for the sites that have C, all of the other ones result in "null".&nbsp; I've tried using an&nbsp;if then else statements and it refuses to calculate anything then.&nbsp; Is there an easier way to cut area C out of B without the calculate field tool?</P></BODY></HTML> Fri, 05 Apr 2019 21:13:40 GMT https://community.esri.com/t5/modelbuilder-questions/how-to-use-caluclate-field-with-quot-null-quot/m-p/823856#M1337 ElizabethOtto 2019-04-05T21:13:40Z Re: How to use caluclate field with "null"? https://community.esri.com/t5/modelbuilder-questions/how-to-use-caluclate-field-with-quot-null-quot/m-p/823857#M1338 <HTML><HEAD></HEAD><BODY><P>I suggest trying the Union tool, then you can just select the pieces you want and sum the area.</P></BODY></HTML> Sat, 06 Apr 2019 04:42:19 GMT https://community.esri.com/t5/modelbuilder-questions/how-to-use-caluclate-field-with-quot-null-quot/m-p/823857#M1338 curtvprice 2019-04-06T04:42:19Z