GeoSpark计算某个区域的面积:
测试数据如下:
10.5,32.11,30.50,60.21,33.50,60.21,10.5,32.11,china1
9.51,30.11,32.50,62.21,34.50,62.21,9.51,30.11,china2
11.5,32.11,31.50,64.21,33.50,64.21,11.5,32.11,china3
10.5,31.16,32.51,63.21,35.51,63.21,10.5,31.16,china4
11.5,32.11,30.50