简介:一、引言GPS技术在大地测量中的应用,改变了传统的测量方法和测量手段,如不要求两大地点问互相通视、在大地点上不需要进行烦琐的水平角、垂直角、距离等的测量,而直接进行定位,且定位结果属于三维坐标。同时也带来了新的课题,如GPS定位结果属于WGS-84坐标系,而实用的测量坐标系属于国家大地坐标系或地方独立坐标系,所以必然存在坐标系的转换问题。许多城市、矿区,军队许多试验靶场基于实用、方便和科学的目的,将地方独立测量控制网建立在当地的平均海拔高程面上,并以当地子午线作为中央子午线进行高斯投影求得平面坐标。
简介:【 摘要 】 目前,城镇公共排水管网建设主体多元化,竣工后的排水管网,无法正常移交到专业单位进行规范化管理。为了解决城镇排水问题,实现水环境质量根本性好转,改善城市生态环境,促进城市生态文明建设,通过先进的技术方法和仪器设备,查清城镇排水管道的健康状况并进行评估,为排水管道养护维修提供重要的基础数据和参考依据。 【 Abstract 】 At present, the main body of urban public drainage network construction is diversified. After completion, the drainage network can not be transferred to professional units for standardized management. In order to solve the problem of urban drainage, realize the fundamental improvement of water environment quality, improve the urban ecological environment and promote the construction of urban ecological civilization, through advanced technology, methods and equipment, the health status of urban drainage pipelines is checked and evaluated, which provides important basic data and reference basis for maintenance of drainage pipelines.