The Moving Average gridding method assigns values to grid nodes by averaging the data within the grid node's search ellipse.
The moving average gridding method can incorporate breakline data.
The moving average 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.
In the Grid Data dialog, specify Moving Average as the Gridding Method and click the Advanced Options button to open the Moving Average Advanced Options dialog.
Set the NoData options and the search ellipse in the Moving Average Advanced Options dialog. |
Specify the minimum number of data options and search ellipse on the General page.
The Minimum number of data (node is set to NoData if fewer) value sets the specified number of points when interpolating a grid node. If the minimum number of points is not found, the NoData value is assigned to the grid node.
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 assigned the NoData value.
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.
The Breaklines page is used to add breaklines to the gridding process. Faults are not supported with Moving Average.
See Also