On Thu, Oct 25, 2018 at 1:20 PM Andrew Harvey <andrew.harv...@gmail.com> wrote:
> So the tower issue aside, if the dish is used for two way communication > then: > > man_made=tower + tower:type=communication +telescope:type=radio + > tower:construction=dish > I would say that is the case even for one-way communication (either direction). The hint is in the word "communication" - if it's used for communication then it doesn't matter whether in one direction or two. If the dish is used for receiving only (whether looking at the stars or > reviving signals from humans in space) then: > > man_made=telescope + telescope:type=radio + tower:construction=dish > Again I have to disagree. One is used for observing the other is used for receiving communications (hint: "communication"). Of course, the same dish might be used for both purposes, switching from one use to the other as required, so any tagging scheme ought to cope with that. And then there's SETI. I'd say that right now all SETI antennas are telescopes but there is a possibility at some future time that some of them may become communications antennae. BTW, these days few radio telescopes are dishes. Most of them are phased arrays and not on towers or masts. -- Paul
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