Using high precision GPS/leveling data and global earth s gravity field models EGM96 and WDM94,the geo-potential difference between Hong Kong Principal Datum (HKPD) and 1956 yellow sea height datum of China was determined in the paper.
本文利用全球重力场模型EGM 96和WDM94及GPS水准数据 ,确定了香港主要高程基准面与我国 195 6黄海高程基准面的重力位差。
Approach to GPS Elevation Fitting Precision;
对GPS高程拟合精度的探讨
Heterogeneity of landscape pattern with elevation in karst area;
喀斯特区域景观空间格局随高程的分异特征
Enhancing Spatial Prediction of Soil Properties Using Elevation;
用高程辅助提高土壤属性的空间预测精度
But the accuracy of GPS altitude control surveying is not very satisfied sometimes.
在矿山建设和生产的测量工作中,GPS定位是目前地面控制的常用方法,但由于在高程精度方面尚不理想。
Good quality of such kind of base can be achieved by control of cement dose, altitude, paving length , capaction times and curing, further improvement of construction quality.
根据稳定砂砾的特点，阐述了对机械摊铺水泥稳定砂砾的监理体会，从对其质量、水泥剂量、高程等方面的控制，进一步改善此类基层的施工质量，对作业面长度、碾压次数、养生等因素的管理，达到机械摊铺水泥稳定砂砾基层的良好程度。
Fining the earth water level,heighten GPS height survey precision;
精化大地水准面 提高GPS高程测量精度
The Application of the Method of Dual Instruments in Height Resurvey and Control Survey;
双仪器法在高程复测和控制测量中的应用
Investigation on the height repetition determination of Qomolangma peak;
珠峰高程复测有关问题的探讨