# 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
• 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.

## 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.

9/10/2014