On 11/03/2015 11:57, Martin Koppenhoefer wrote:
maybe the tower has a point defined (e.g. top of the antenna or a sign or similar) which could be a survey_point.
Since surveyors have to take bearings-from as well as bearings-to survey points, the point would have to be located where survey instruments can be set up. One would expect, therefore, that these points would be at ground level. That is how the Wiki illustrates them.
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