zone map

The resultant Z_a magnetic anomaly map consists of two major magnetic anomaly zones: positive anomaly Zone in the north part and the negative anomaly zone in the south part.

由此得到的Z a磁异常平面图，北部为正异常区，异常很不规则，有三个局部异常；

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It also has the following functions: zoom-in, zoom-out and roam of map, buffer_zone analyzing, measuring perimeter and area of certain zone on the map.

可以实现地图的自由放大、缩小、漫游及缓冲区分析，可以量测不同区域的周长、面积；

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