button to display the Moving
Average Options dialog.The Moving Average gridding method assigns values to grid nodes by averaging the data within the grid node's search ellipse. This gridding method is not recommended for generating maps from small and moderate-sized data sets. It is, however, a useful tool for characterizing and investigating large and very large spatial data sets.
To use Moving Average, define a search ellipse and specify the minimum number of data to use. For each grid node, the neighboring data are identified by centering the search ellipse on the node. The output grid node value is set equal to the arithmetic average of the identified neighboring data. If there are fewer than the specified minimum number of data within the neighborhood, the grid node is blanked.
In the Property
Manager Gridding page, select Moving
Average as the
Gridding
method and then click
the Advanced Options
button to display the Moving
Average Options dialog.
Set gridding options in the Moving Average Options dialog.
The Minimum number of data (node is blanked if fewer) value sets the specified number of points when interpolating a grid node. If the minimum number of points is not found, the blanking value is assigned to the grid node.
Search ellipses are specified by defining the ellipse radii and the angle for the ellipse. Radius 1 and Radius 2 are positive values indicating the distance in data units. Angle is the inclination between the positive X axis and the ellipse axis associated with Radius 1. This can be any value between -360 and +360 degrees.
See Also