If the capitalization is incorrect, the expression will be invalid and fail to execute because Python is case sensitive. The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. Therefore, when Boolean operators are used in the same expression as Relational operators, the Boolean operators will be executed first. Numerical values and mathematical operators can be added to the expression by clicking the respective buttons in the tool dialog box. Saving a File requires SaveFile Tickets that can be bought within the app. When multiple operators are used in an expression, they are not necessarily executed in left-to-right order. Boolean (~, &, ^, |) operators have a higher precedence level than Relational (<, <=, >, >=, ==, !=) operators. The mapping platform for your organization, Free template maps and apps for your industry. Builds and executes a single Map Algebra expression using Python syntax in a calculator-like interface. See Creating output from Map Algebra for information on producing output from Map Algebra expressions in Python. 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. The Raster Calculator in the Raster menu allows you to perform calculations on the basis of existing raster pixel values (see figure_raster_10). The only differences are the following: You can easily clip a raster dataset by setting the extent environment and specifying the input raster name in the expression. If you select a variable from the variable list, it will be automatically added to the expression at the current cursor location. The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. To avoid this potential problem, use appropriate parentheses in the expression so that the execution order of the operators is explicitly defined. You should not rename a variable that is connected to the tool, since the variable will not be renamed within the expression. If you delete the connection to a variable, the variable is not removed from the expression. Certain Raster storage environments may apply to this tool when output is in a raster format other than Esri Grid. Raster Calculator tool dialog box examples In ModelBuilder, the following variable types are valid inputs for an expression: Data (Raster dataset, raster layer, raster band, .lyr layer file). Deferred evaluation is an optimization technique where individual components of an expression are intelligently processed so as to minimize the creation of intermediate datasets on disk. Full paths to data or data existing in the specified current workspace environment setting can be entered in quotes (""). Numerical values (and mathematical operator symbols) can be added to the expression directlly. The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. Learn more about how Raster Calculator works. When the tool is executed, the resulting raster output will be clipped based on the specified extent. The operators in the Raster Calculator tool dialog box are: Multiple geoprocessing tools and operations can be combined in a map algebra expression using standard Python syntax. The results are written to a new raster layer with a GDAL-supported format. If you select a variable from the variable list, it will be automatically added to the expression at the current cursor location. The Raster Calculator tool can be used in ModelBuilder, but keep the following points in mind: For example, inraster when selected from the variable list will become "%inraster%" in the expression. The operator with the highest precedence value will be executed first. You can use parentheses to control the execution order. The Raster Calculator tool allows you to create and execute a Map Algebra expression that will output a raster. The syntax of the expression determines how variables are to be specified. You should not rename a variable that is connected to the tool, since the variable will not be renamed within the expression. When the tool is executed, the resulting raster output will be clipped based on the specified extent. The operators in the Raster Calculator tool dialog box are: Multiple geoprocessing tools and operations can be combined in a map algebra expression using standard Python syntax. When multiple Relational and/or Boolean operators are used consecutively in a single expression, in some cases it may fail to execute. For more information on operator precedence, see operator precedence table. Only operators and tools that process on a per-cell basis can take advantage of this capability. You do not need to put the output raster name or the. Using the Raster Calculator … 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.
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