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How does average nearest neighbor work?
The average nearest neighbor ratio is calculated as the observed average distance divided by the expected average distance (with expected average distance being based on a hypothetical random distribution with the same number of features covering the same total area).
What is expected distance?
Expected Mean Distance: would be the average distance between a point and its closest neighbor if the N-number of points were distributed randomly. Observed Mean Distance: the actual average distance between each point and the closest neighboring point.
What is distance neighbor?
The observed linear nearest neighbor distance, Ld(NN), is calculated by CrimeStat. as the average of indirect distances between each point and its nearest neighbor. The. expected linear nearest neighbor distance is given by.
How do you find the neighbors of a polygon?
To find the neighbors of each individual polygon in the input, specify one or more input fields that result in a unique value or set of values (in the case of multiple fields) for every polygon. If the specified fields identify unique polygon groups, the neighboring information is summarized and reported by the groups.
How are polygon neighbors reported in ArcGIS Pro?
If the specified fields identify unique polygon groups, the neighboring information is summarized and reported by the groups. See How Polygon Neighbors works for details on the use of this parameter.
How to calculate the area of a polygon?
The detailed workflow is as follows: Select a polygon to use as the source feature. Find all the polygons that intersect the source polygon (find the neighbors). Add the AREA field to the output table. Calculate the area of the overlap. Record the calculated area for use in the output table AREA field.
Which is the best method for average nearest neighbor?
The average nearest neighbor method is very sensitive to the Area value (small changes in the Area parameter value can result in considerable changes in the z-score and p-value results). Consequently, the Average Nearest Neighbor tool is most effective for comparing different features in a fixed study area.