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Weighted Mean Center of Points (1.2c)



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Author Jeff Jenness
File Name Weighted_Mean.zip
Language Avenue
Last Modified Mar 11 2004
Status of work Public Domain
Software ArcView GIS
File Size 120.25 kb
Downloads 1918

ArcScripts is intended for the free exchange of scripts and tools related to ESRI software products. Please alert the moderator if this script is a demo, trial-version, or an advertisement for a retail product.

Summary
DESCRIPTION: This extension creates a new button on the VIEW toolbar which enables the user to calculate the weighted mean of a group of points. You have the option to create a RESULTS table containing this information, a new shapefile of the weighted mean center point, and/or a graphic symbol representing the weighted mean.

ALL OR ONLY SELECTED RECORDS: You can either use all the points in the point theme for the analysis, or only selected points. If any points in that theme are selected, then only those selected points in that theme will be used in the analysis. If no points in the theme are selected, then all points in that theme will be used in the analysis.

PROJECTED VS. UNPROJECTED VIEWS: If your original data are in Lat/Long coordinates (the Geographic Projection) and your View has been projected, then you have the option to calculating your mean center based on either the Geographic Projection or your View Projection. The choice of projections can dramatically affect the location of the mean of the point coordinates used in the analysis.

OUTPUT: Upon completion, you will have one or all of the following:

1) A Results table,
2) A Shapefile containing a single point representing the weighted mean center of the point theme, and/or
3) A Graphic Symbol displayed on the view representing the weighted mean center of the point theme.

REVISIONS: The 1.2b revision (Nov. 21, 2003) modifies the update script to avoid an “AVArray” error and modifies the calculation script to ignore null points. The 1.2c revision (March 11, 2004) modifies the calculation script to ignore null weight values, and produces a report notifying you if any null points or weight values were encountered.

An on-line version of the documentation may be viewed at:

http://www.jennessent.com/arcview/weighted_mean.htm

Please visit Jenness Enterprises ArcView Extensions site for more ArcView Extensions and other software by the author.

http://www.jennessent.com/arcview/arcview_extensions.htm

Enjoy! Please contact the author if you have problems with this extension.

Jeff Jenness
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