ARC GIS ENGINE二次開發實例代碼，提供了地圖鷹眼功能等-ARC GIS ENGINE secondary development of example code, providing maps Hawkeye functions

自己整理的gis投影相关知识，涉及大地坐标系，投影坐标系。有利于加深对地理坐标系以及投影坐标系的理解-Finishing their gis projection knowledge, involving geodetic coordinate system, projected coordinate system. Conducive to deepen the geographic coordinate system and projection coordinates understand