大地坐标系与投影坐标系

GEODETIC COORDINATE SYSTEM AND PROJECTIVE COORDINET SYSTEM

在物探化探工作中,所有的测点在陆地、海洋、空中均有它唯一的空间位置。在工作的不同阶段,测点位置按工作设计要求采用不同的方式予以标示。在实地观测时,测点定位采用全球定位系统GPS(DGPS),由大地坐标系的大地坐标标示测点位置。在展示工作成果时,则采用投影坐标系的平面直角坐标标示测点位置。这里介绍了大地坐标系、常用投影坐标系的建立与特征,投影坐标系的选择与应用,不涉及具体的计算公式。

Geophysical and geochemical exploration work,all measuring points has its only location on land,in sea and air space.According to the design requirements of work,the measuring points were marked by different ways in different stages.In the field observations,the measured points positioning by GPS(global positioning system) or DGPS(difference global positioning system) were marked by geodetic coordinate in geodetic coordinate system.In showing work,the measuring points were marked by plane rectangular coordinate in projective coordinate system.In this article,establishment and characteristics of geodetic coordinate system and common projective coordinate system,selection and application of projective coordinate system were described,but specific formulas were not involved.