遇到問題：在合并兩個點shp文件總是報錯，查看后找到原因

關于Shapefile的multipoint feature和point feature,ESRI是如下定義的：multipoint feature **A feature that consists of**more than one point but only references one set of attributes**in the database. For example, a system of oil wells might be**considered a multipoint feature, since there is a single set of**attributes for multiple well holes.point feature A zero-dimensional**abstraction of an object; a single x,y coordinate pair that**represents a geographic feature too small to be displayed**as a line or area at that scale.

解決辦法：使用ArcGIS的ArcToolbox里的Data Managemnt Tools--Features--Feature to Point工具轉換。雖然ArcGIS幫助里沒有介紹Feature to Point可以把Shapefile格式的 multipoint feature 轉化為point feature功能。但這個工具的確可以轉換，比較好用。

當然，使用低版本MapInfo的通用轉換器轉換，把MapInfo的tab格式轉換為shp格式時生成的是point feature。