[GIS] Multiple CON Expression in ArcGIS Raster Calculator

arcgis-desktopraster-calculator

How can I write the following conditional statement with CON?

If ((VALUE = 20 OR IF VALUE=24) then assign value 0, else 1)

Con(("Raster1", 0, 1, "VALUE =20")|("Raster1", 0, 1, "VALUE =24"),0,1)

I just can´t get this to work

Best Answer

Read about Raster Calculator operators. The bar "|" symbol is the OR operator.

The correct syntax would be:

Con(("Raster1" == 20) | ("Raster1" == 24), 0, 1)

Related Solutions

ArcGIS Raster Calculator – How to Use OR in a CON Statement in ArcGIS Raster Calculator

For building complex statements, you can get more information here

It is important to know the precedence level of the operators. For example, Boolean (~, &, ^,|) operators have a higher precedence level than Relational (<, <=, >, >=, ==, !=) operators, which has an impact on how you construct your expressions. For more information on operator precedence, see the second table on this page

I copied the above-mentioned table at the end of my post, it goes from lowest to highest precedence(note that it is not the same precedence in C++). Operators with the highest precedence are grouped together first, this is why you need parentheses if you want to force evaluating ">" before "|".

Without parentheses, your parser is trying to read

Con(("Raster1" > (10 | "Raster2") < 20),30)

<, <=, >, >=, ==, != (Less Than, Less Than Equal, Greater Than, Greater Than Equal, Equal To, Not Equal)

| (Boolean Or)

^ (Boolean XOr)

& (Boolean And)

<<, >> (Bitwise Left Shift, Bitwise Right Shift)

+, - (Addition, Subtraction)

*, /, //, % (Multiplication, Division, Integer Division, Modulo)

+, -, ~ (Unary Plus, Negate, Boolean Not)

** (Power)

Best Answer

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ArcGIS Raster Calculator – How to Use OR in a CON Statement in ArcGIS Raster Calculator

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