1.數(shù)據(jù)格式轉(zhuǎn)換 2.坐標(biāo)系統(tǒng)變換 3.數(shù)據(jù)的編輯 4.柵格數(shù)據(jù)的矢量化轉(zhuǎn)換 5.數(shù)據(jù)分塊