摘要
GNSS观测需要经过两次投影变换得到平面坐标成果。在实际工程中使用,一次是投影到参考椭球面,一次是投影到平面,这两次投影都会引起长度变形。当每公里形变量大于2.5cm时,不能满足工程需要,需要对其改正。结合函数的定义域、值域可以求得符合形变要求的高程范围和坐标范围。
Two times of projection transformation are needed to obtain plane coordinate results in GNSS observation.In practical engineering,one is projected to the reference ellipsoid,and the other is projected to the plane.Both projections will cause length distortion.When the deformation per kilometer is larger than 2.5 cm,it can not meet the project needs and should be corrected.Combining the definition range and value range of the function,the elevation range and coordinate range which meet the deformation requirement can be obtained.
作者
张世越
杨珂凡
ZHANG Shiyue;YANG Kefan(Shangrao City Water Conservancy and Electricity Survey and Design Institute,Shangrao 334000,China;Jiangxi Guangxing Surveying and Mapping Co.,Ltd.,Shangrao 334000,China)
出处
《江西测绘》
2019年第4期6-9,共4页
JIANGXI CEHUI
关键词
GNSS控制网
长度变形
椭球膨胀法
变换中央子午线法
边长约束法
GNSS Control Network
Length Deformation
Ellipsoid Expansion Method
Central Meridian Transform Method
Length Constraint Method
