Local function

Available with Spatial Analyst license.

The Local function allows you to perform bitwise, conditional, logical, mathematical, and statistical operations on a pixel-by-pixel basis. Depending on the operation type, it may require 1, 2, 3 or n input rasters. You may need to stack a few Local functions together in order to achieve some of the conditional and logical functions.

License:

This function requires the ArcGIS Spatial Analyst extension to be enabled.

There are four parameters for this function:

• Input
• Operations
• Cell Size
• Extent

Input

There are several inputs that can be used within the Local function. The Local function only works on a single band. If you have a multiple-band raster, use the Extract Band function to specify which band to use in the Local function.

Add raster from disk	Add a raster that is on disk. You can add raster datasets, mosaic datasets, and raster products.
Add function chain	Add a function chain as an input.
Add scalar	Add a scalar value. Scalar values must be numeric.
Add Variable	Add a variable. The variable is a string representing a raster that will be set at run time. Normally, it is the variable names used in mosaic dataset.
Add reference to selected input	Add a referenced copy of the selected raster or the selected function chain input. A change in the referenced raster or the function chain will be reflected in this referenced copy. This can be useful when creating many Local functions that may use the same referenced input.
Add copy of selected input	Add a static copy of the selected function chain input. A change in the copied function chain will not reflect this static copy. This can be useful when creating many similar Local functions where there is a slight change in the function chains.

Operations

The operations will perform the specified function on the input rasters. The Operation information box informs you which Operation was chosen and how many inputs are needed.

Bitwise
Bitwise And	Performs a Bitwise And operation on the binary values of two input rasters.
Bitwise Left Shift	Performs a Bitwise Left Shift operation on the binary values of two input rasters.
Bitwise Not	Performs a Bitwise Not (complement) operation on the binary value of an input raster.
Bitwise Or	Performs a Bitwise Or operation on the binary values of two input rasters.
Bitwise Right Shift	Performs a Bitwise Right Shift operation on the binary values of two input rasters.
Bitwise XOr	Performs a Bitwise eXclusive Or operation on the binary values of two input rasters.
Cell Statistics
Majority	Determines the majority (value that occurs most often) of the inputs.
Maximum	Determines the maximum (largest value) of the inputs.
Mean	Calculates the mean (average) of the inputs.
Median	Calculates the median of the inputs.
Minimum	Determines the minimum (smallest value) of the inputs.
Minority	Determines the minority (value that occurs least often) of the inputs.
Range	Calculates the range (difference between largest and smallest value) of the inputs.
Standard Deviation	Calculates the standard deviation of the inputs.
Sum	Calculates the sum (total of all values) of the inputs.
Variety	Calculates the variety (number of unique values) of the inputs.
Majority (Ignore NoData)	Determines the majority (value that occurs most often) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Maximum (Ignore NoData)	Determines the maximum (largest value) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Mean (Ignore NoData)	Calculates the mean (average) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Median (Ignore NoData)	Calculates the median of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Minimum (Ignore NoData)	Determines the minimum (smallest value) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Minority (Ignore NoData)	Determines the minority (value that occurs least often) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Range (Ignore NoData)	Calculates the range (difference between largest and smallest value) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Standard Deviation (Ignore NoData)	Calculates the standard deviation of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Sum (Ignore NoData)	Calculates the sum (total of all values) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Variety (Ignore NoData)	Calculates the variety (number of unique values) of the inputs. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. Only cells that have data values will be used in determining the output.
Conditional
Con	Performs a conditional If, Then, Else operation. When a Con operator is used, there usually needs to be two or more local functions chained together, where one local function states the criteria and the second local function is the Con operator which uses the criteria and dictates what the true and false outputs should be.
Set Null	Set Null sets identified cell locations to NoData based on a specified criteria. It returns NoData if a conditional evaluation is true, and returns the value specified by another raster if it is false.
Logical
Boolean And	Performs a Boolean And operation on the cell values of two input rasters. If both input values are true (non-zero), the output value is 1. If one or both inputs are false (zero), the output is 0.
Boolean Not	Performs a Boolean Not (complement) operation on the cell values of the input raster. If the input values are true (non-zero), the output value is 0. If the input values are false (zero), the output is 1.
Boolean Or	Performs a Boolean Or operation on the cell values of two input rasters. If one or both input values are true (non-zero), the output value is 1. If both input values are false (zero), the output is 0.
Boolean XOr	Performs a Boolean eXclusive Or operation on the cell values of two input rasters. If one input value is true (non-zero) and the other false (zero), the output is 1. If both input values are true or both are false, the output is 0.
Equal To	Performs a Relational equal-to operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster equals the second raster and 0 for cells where it does not.
Greater Than	Performs a Relational greater-than operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster is greater than the second raster and 0 for cells if it is not.
Greater Than Equal	Performs a Relational greater-than-or-equal-to operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster is greater than or equal to the second raster and 0 if it is not.
Is Null	Determines which values from the input raster are NoData on a cell-by-cell basis. Returns a value of 1 if the input value is NoData and 0 for cells that are not.
Less Than	Performs a Relational less-than operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster is less than the second raster and 0 if it is not.
Less Than Equal	Performs a Relational less-than-or-equal-to operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster is less than or equal to the second raster and 0 where it is not.
Not Equal	Performs a Relational not-equal-to operation on two inputs on a cell-by-cell basis. Returns 1 for cells where the first raster is not equal to the second raster and 0 for cells where it is equal.
Math
Abs	Calculates the absolute value of the cells in a raster.
Divide	Divides the values of two rasters on a cell-by-cell basis.
Exp	Calculates the base e exponential of the cells in a raster.
Exp10	Calculates the base 10 exponential of the cells in a raster.
Exp2	Calculates the base 2 exponential of the cells in a raster.
Float	Converts each cell value of a raster into a floating-point representation.
Int	Converts each cell value of a raster to an integer by truncation.
Ln	Calculates the natural logarithm (base e) of cells in a raster.
Log10	Calculates the base 10 logarithm of cells in a raster.
Log2	Calculates the base 2 logarithm of cells in a raster.
Minus	Subtracts the value of the second input raster from the value of the first input raster on a cell-by-cell basis.
Mod	Finds the remainder (modulo) of the first raster when divided by the second raster on a cell-by-cell basis.
Negate	Changes the sign (multiplies by -1) of the cell values of the input raster on a cell-by-cell basis.
Plus	Adds (sums) the values of two rasters on a cell-by-cell basis.
Power	Raises the cell values in a raster to the power of the values found in another raster.
Round Down	Returns the next lower integer value, just represented as a floating point, for each cell in a raster.
Round Up	Returns the next higher integer value, just represented as a floating point, for each cell in a raster.
Square	Calculates the square of the cell values in a raster.
Square Root	Calculates the square root of the cell values in a raster.
Times	Multiplies the values of two rasters on a cell-by-cell basis.
Trigonometric
ACos	Calculates the inverse cosine of cells in a raster.
ACosH	Calculates the inverse hyperbolic cosine of cells in a raster.
ASin	Calculates the inverse sine of cells in a raster.
ASinH	Calculates the inverse hyperbolic sine of cells in a raster.
ATan	Calculates the inverse tangent of cells in a raster.
ATan2	Calculates the inverse tangent (based on x,y) of cells in a raster.
ATanH	Calculates the inverse hyperbolic tangent of cells in a raster.
Cos	Calculates the cosine of cells in a raster.
CosH	Calculates the hyperbolic cosine of cells in a raster.
Sin	Calculates the sine of cells in a raster.
SinH	Calculates the hyperbolic sine of cells in a raster.
Tan	Calculates the tangent of cells in a raster.
TanH	Calculates the hyperbolic tangent of cells in a raster.

Cell size and Extent

Choose which cell size to use in the output raster. If all the input cell sizes are the same, then all the options will yield the same results.

Cell size

First	Use the first cell size of the input rasters. This is the default.
Last	Use the last cell size of the input rasters.
Max	Use the largest cell size of all the input rasters.
Mean	Use the mean cell size of all the input rasters.
Min	Use the smallest cell size of all the input rasters.

Choose which extent should be used in the output raster.

Extent

First	Use the extent of the first input raster to determine the processing extent. This is the default.
Intersection	Use the extent of the overlapping pixels to determine the processing extent.
Last	Use the extent of the last input raster to determine the processing extent.
Union	Use the extent of all the rasters to determine the processing extent.

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