Contents
What are focal statistics?
The Focal Statistics tool performs a neighborhood operation that computes an output raster where the value for each output cell is a function of the values of all the input cells that are in a specified neighborhood around that location.
What is a focal function?
Focal, or neighborhood, operations produce an output raster dataset in which the output value at each cell location is a function of the input value at a cell location and the values of the cells in a specified neighborhood around that location.
What is local function GIS?
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.
How is the neighborhood processing for focal statistics?
To illustrate the neighborhood processing for Focal Statistics calculating a Sum statistic, consider the processing cell with a value of 5 in the following diagram. A rectangular 3 by 3 cell neighborhood shape is specified.
What is the function of the focal statisticstool?
The Focal Statisticstool performs a neighborhood operation that computes an output raster, where the value for each output cell is a function of the values of all the input cells that are in a specified neighborhood around that location.
When do you use nodata in focal statistics?
NODATA —Specifies that if any cell in a neighborhood has a value of NoData, the output for the processing cell will be NoData. With this option, the presence of a NoData value implies that there is insufficient information to determine the statistic value for the neighborhood. The output focal statistics raster.
How are processing cells included in neighborhood statistics?
The value of the processing cell, as well as all the cell values in the identified neighborhood, is included in the neighborhood statistics calculation. The neighborhoods can overlap so that cells in one neighborhood may also be included in the neighborhood of another processing cell.