重庆市十大必去打卡景点 Abstract： Equivalent difference latitude parallel polyconic projection needs good contrast of area to solve world map projection. The projection of latitude divides latitude is not by equivalent but according a certain difference that from central of longitude，三明市教育局 gradually shortening latitude by a certain difference， and can keep the areas being little difference of the same longitude difference and latitude difference. Equivalent difference latitude parallel polyconic projection based on MAPGIS is the use of a normal and inverse solution transformation下川岛王府洲旅游度假区， to achieve the appropriate procedures and error analysis旅游公司十大排名， has better practical value.
