In ModelBuilder, the following variable types are valid inputs for an expression: Data (Raster dataset, raster layer, raster band, .lyr layer file). Raster Calculator is designed to execute a single-line algebraic expression using multiple tools and operators using a simple, calculator-like tool interface. Full paths to data or data existing in the specified current workspace environment setting can be entered in quotes (""). If you select a variable from the variable list, it will be automatically added to the expression at the current cursor location. It is not intended for use in scripting and is not available in the ArcPy Spatial Analyst module. In ModelBuilder, the following variable types are valid inputs for an expression: Data (Raster dataset, raster layer, raster band, .lyr layer file). See Map Algebra in Spatial Analyst to learn about how to perform your analysis in Python. To change the order of execution, use parentheses. Raster Calculator tool dialog box examples If the capitalization is incorrect, the expression will be invalid and fail to execute because Python is case sensitive. Boolean (~, &, ^, |) operators have a higher precedence level than Relational (<, <=, >, >=, ==, !=) operators. Operators and tools that support deferred evaluation are included on the raster calculator tool itself either as a button or in the list of tools provided. The mapping platform for your organization, Free template maps and apps for your industry. When typing tool names, be sure to check the tool name syntax. The operator with the highest precedence value will be executed first. It is not intended for use in scripting and is not available in the ArcPy Spatial Analyst module. The Tools list provides a selection of commonly used conditional and mathematical tools, allowing you to easily add them to the expression. You do not need to put the output raster name or the. Numbers and scalars can be directly entered into an expression. For more information on operator precedence, see operator precedence table. To avoid this potential problem, use appropriate parentheses in the expression so that the execution order of the operators is explicitly defined. Full paths to data or data existing in the specified current workspace environment setting can be entered in quotes (""). When a dataset or variable is used in the expression, a link between the variable and the tool will be created. When the tool is executed, the resulting raster output will be clipped based on the specified extent. If you delete the connection to a variable, the variable is not removed from the expression. The operators in the Raster Calculator tool dialog box are: / (Division) == (Equal To) != (Not Equal) & … Therefore, when Boolean operators are used in the same expression as Relational operators, the Boolean operators will be executed first. The results are written to a new raster layer with a GDAL-supported format. The performance of an operation may be enhanced by the deferred evaluation capabilities of Map Algebra. If you do so, the expression will be invalid. Numerical values (and mathematical operator symbols) can be added to the expression directlly. Numerical values and mathematical operators can be added to the expression by clicking the respective buttons in the tool dialog box. Upon model validation: Layer names will be enclosed in double-quote symbols (, Long, double, or Boolean-type variables will be enclosed in percent symbols (, Variables representing dataset names or strings should be enclosed in both quotes and percent symbols (. Certain Raster storage environments may apply to this tool when output is in a raster format other than Esri Grid. Learn more about how Raster Calculator works. Therefore, when Boolean operators are used in the same expression as Relational operators, the Boolean operators will be executed first. When typing tool names, be sure to check the tool name syntax. Builds and executes a single Map Algebra expression using Python syntax in a calculator-like interface. When the tool is executed, the resulting raster output will be clipped based on the specified extent. Only operators and tools that process on a per-cell basis can take advantage of this capability. If you do so, the expression will be invalid. In ModelBuilder, the following variable types are valid inputs for an expression: Data (Raster dataset, raster layer, raster band, .lyr layer file). When a dataset or variable is used in the expression, a link between the variable and the tool will be created. If you remove the variable from the expression, the associated link between the variable and the tool will also be removed. While Map Algebra is used both in the Raster Calculator and directly in Python, there are some differences in the syntax that you should be aware of. In Python, Map Algebra expressions should be created and executed with the Spatial Analyst module, which is an extension of the ArcPy Python site package. The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. A list of commonly used conditional and mathematical tools is provided, allowing you to easily add them to the expression. Since there is a specific output parameter in the Raster Calculatortool dialog box, Map Algebra expressions do not include an output name and an equals sign (=) when using the Raster Calculator.

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