Local Function

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.

The inputs for this function are the following:

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 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.

Related Topics

9/10/2014