On Tue, Sep 7, 2010 at 1:26 PM, M∡rtin Koppenhoefer <dieterdre...@gmail.com> wrote: > I agree that the differentiation tower/pole is flawed (I already wrote > this above).
In that case we need to come up with a better one. Obviously there is a difference between the huge "towers" and the small "poles". Something with diagonal trusses is probably always not a pole, and something with just a single closed curve where it touches the ground is probably always a pole. But in between? The main other case seems to be where there are multiple poles supporting one circuit, usually with cross connections between the poles. Every photo Alan posted (except the structure within the substation), and every type I can think of, seems to fit squarely into one of these three categories: *Many structural diagonal trusses, usually metal, multiple points where it touches the ground *Single pole (solid or hollow) *Several poles, usually connected by horizontal or sometimes diagonal members whose primary purpose is to support the cables rather than structural Note that the final category can include the case of three adjacent single poles without cross-connections where each pole carries one cable of a circuit. Can anyone think of a type of structure that supports transmission lines between substations that does not fit one and only one of these categories? _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
