Benchmarks 88 Datum

In surveying, benchmarks represent points of reference for measurement. This layer shows benchmark points for all of Orange County. It includes the northing, easting and elevation for each point. A detailed description on relative location is also included. Orange County Public Works Survey.在测绘领域中，基准点（Benchmark）是测量所用的参考点位。本图层展示了奥兰治县全域的所有基准点，包含每个基准点的北距、东距与高程信息，同时还附有各基准点相对位置的详细说明。本数据集由奥兰治县公共工程测绘部（Orange County Public Works Survey）提供。