Advancements in understanding the Earth's geoid already are producing purely gavimetric geoid models critical to making accurate vertical transformations and overall elevation refinements for any given vertical datum. vertical, vertical-datum, height, height-system and gravity are common terms to search and should be added to the tags list.

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    Why create tags when you can already search for them as strings? – PolyGeo Oct 5 '13 at 10:41
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    Tags are created by posters (and occasionally by high-reputation answerers) as they are needed to describe questions that are actually asked. We do not maintain the tags list as an independent dictionary of the subject. – whuber Oct 5 '13 at 15:20

I think the and tags are enough to cover this. The fact that any user with at least 300 reputation (see Privileges in the Help Center) can create tags and that these haven't been created yet suggests that other tags have been sufficient. Not every word in the English language relating to GIS needs to be a tag, just enough to help organize things.

When should I create new tags?

Most common tags already exist on a mature site. You should always favor existing tags; only create new tags when you feel you can make a strong case that your question does cover a new topic that nobody else has asked about before on this site.

  • Time will tell - that's the answer I suppose you're saying - and that makes sense. And Poly's rhetorical question really does too, really. For example, user1205577's question from 6 weeks ago (found because it was tagged with geoid) Height of the geoid in ECEF coordinates is answered completely with the string search in Google – V. Kelly Bellis Oct 5 '13 at 11:29
  • I am wondering whether you are using a browser or mobile client because the browser client makes SE searches like this easy while only Google searches seem to be available from the mobile client. – PolyGeo Oct 6 '13 at 0:00
  • I understand whubwer's and blah238's answers, but i do not understand "Poly's rhetorical question" (about strings). In fact i flagged it as unconstructive. Am i stupid? What has google or strings got to do with the purpose or function of tags? Thanks. – Martin F Dec 12 '13 at 18:20

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