通过设置查询图层、字段，找出符合查询条件的属性值并显示出来-By setting the query layer, fields, identify the attribute values ​ ​ match the query and display

可以将一张图中面积最大且最在中心的图圈起来，并且找出他的roi，是经过改善的找圆方式。-One figure in the center of the largest and most can be circled in Figure, and find his roi, is the result of an improved way to find a circle.