The job is to collect observations of features to be mapped and thereby determine their coordinates observations are things, such as angles and distances, a surveyor “observed” using an instrument maps are drawn using the coordinates of the features
A horizontal geodetic datum.. is a system by which latitude and longitude coordinates are assigned to places of interest i.e., the foundation of spatial coordinates note bene: height is not included
Surveying on the Sphere To construct and use geodetic datums we must be able to determine latitude and longitude coordinates from surveying observations. That requires spherical trigonometry
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