The paper gave some methods for calculating the area of anomalistic area on plane , and then deduced the methods for calculating coordinates points and counting grids , and finally the paper gave another method of counting pixels 介紹幾種求取平面不規(guī)則區(qū)域面積的方法,再推演出專用于計算海域面積的坐標(biāo)法和方格法,并給出一種適合計算機計算的數(shù)點法。