# An overview of the map algebra operators

Spatial Analyst のライセンスで利用可能。

Image Analyst ライセンスで利用できます。

Map algebra supports a series of operators. The operators can be grouped into Arithmetic, Bitwise, Boolean, and Relational categories. The map algebra operators are available with the ArcGIS Spatial Analyst license and the ArcGIS Image Analyst license.

The operators are overloaded since they exist in the Spatial Analyst ArcPy module, the Image Analyst ArcPy module, and as standard operators in Python. To distinguish whether an input is a raster as opposed to a scalar variable, the input raster is cast using the Raster class: Raster("inRas"). The available operators are listed in the table below.

In operators that accept two inputs, if both inputs are scalars, the Python operator will be used working on scalars. If one or both of the inputs are rasters (identified by casting with the Raster class), the ArcPy operator is used and will work on each cell within the rasters. For those operators that accept a single input, if it is a scalar, the Python operator is used; if a raster is input, the ArcPy operator is used.

## Operators by category

The available operators are listed by category in the following table.

Map algebra operatorDescriptionImage Analyst geoprocessing tool

Arithmetic

Plus

Unary plus

N/A

Subtraction

Minus

Unary minus

Negate

Multiplication

Times

Power

Power

Division

Divide

Integer division

N/A

Modulo

Mod

Bitwise

Bitwise left shift

Bitwise Left Shift

Bitwise right shift

Bitwise Right Shift

Boolean

Boolean and

Boolean And

Boolean complement

Boolean Not

Boolean or

Boolean Or

Boolean exclusive or

Boolean XOr

Relational

Equal to

Equal To

Greater than

Greater Than

Greater than or equal to

Greater Than Equal

Less than

Less Than

Less than or equal to

Less Than Equal