You can use parentheses to control the execution order.īoolean ( ~, &, ^, |) operators have a higher precedence level than Relational (, >=, =, !=) operators. For more information on operator precedence, see operator precedence table. The operator with the highest precedence value will be executed first. When multiple operators are used in an expression, they are not necessarily executed in left-to-right order. To create a raster with cells of a constant value, specify the appropriate extent and cell size environment settings and enter the numerical value into the expression. When the tool is executed, the resulting raster output will be clipped based on the specified extent. You can easily clip a raster dataset by setting the extent environment and specifying the input raster name in the expression. You do not need to cast input data as a Raster object when using operators.
You do not need to put the output raster name or the = sign in the expression because the output name is specified in the Output raster parameter.The tool supports the standard Map Algebra syntax that is used in Python scripting. If the capitalization is incorrect, the expression will be invalid and fail to execute because Python is case sensitive.Īn example of the general format of a Map Algebra expression using using geoprocessing tools is: When typing tool names, be sure to check the tool name syntax.
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