墨卡托投影中区分昼夜半球的方法与实现  

Dividing day and night on a map in Mercator Projection

作　　者：张昆[1] 张松林[2] 

机构地区：[1]华东师范大学地理信息科学教育部重点实验室,上海200241 [2]同济大学测绘与地理信息学院,上海200092

出　　处：《华中师范大学学报（自然科学版）》2013年第4期587-590,共4页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(41174003);华东师范大学GIS实验室主任基金项目(KLGIS2011C03)

摘　　要：墨卡托投影是一个使用广泛的地图投影,针对该投影,该文引入了日照的概念.任一时刻,地球表面上有一半区域被太阳照射成为白天,另一半因背光而处于黑夜.昼夜的分布对人类和动植物的活动起着决定性的作用,根据地图投影方程,用坐标变换的方法,将地球表面当前被太阳照射的状态反映到地图上,为二维地图增加时间维,并用矢量和栅格两种方法在图上区分出白天黑夜,比较了这两种方法的优缺点.Mercator projection is widely used in mapping. Here sunlight is introduced to a map in Mercator projection. At any moment, there is a half of the Earth in sunlight, while the other half in darkness. The distribution of day and night plays a decisive role in the activities of human beings, animals and plants. By means of coordinate transformation and map projection formulas, this paper provides a detailed implementation to divide day and night on the map, thus a time dimension is added to the two-dimensional map, in which both vector and raster methods are used, and its the advantage and disad- vantages are compared.

关 键 词：墨卡托投影 日照 昼夜半球 

分 类 号：P282.1[天文地球—地图制图学与地理信息工程]