实现经纬度坐标与直角坐标之间的相互转换，以及角度不同表示方法的转换（弧度、度、度分、度分秒等）。-The realization of latitude and longitude coordinates and rectangular coordinates between the conversion and that the perspective of different methods of conversion (radians, degrees, degrees minutes d

从专业开发者的角度系统而详细地讲解了如何进行ArcGIS 二次开发的编程选材具有极强的针对性和实用性内容翔实基础实用旨在帮助开发人员能尽快掌握ArcGIS的二次开发-From the perspective of professional developers explain in detail the system and how to conduct the secondary development of ArcGIS programming material is highly rele

导读：本章从空间认知的角度讲述了对现实世界进行抽象的过程。空间认知属于行为地理学的范畴，它研究个体如何对现实世界进行认知-Introduction: This chapter from the perspective of spatial cognition about the real world the process of abstraction. Behavior of spatial cognition is the scope of geography, which studies