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When using SearchShape to perform spatial queries on datasets that have z-values (elevations), the query results may include undesired features. Specifically, features may be returned whose x- and y-values meet the search criteria, but whose z-values fall outside the search criteria.
moExtentOverlap is the only SearchMethod constant that considers z-values when performing a selection. If you use SearchShape with any other SearchMethod constant, z-values will be ignored.