[Tagging] Feature Proposal - RFC - Topographic Prominence

Joseph Eisenberg joseph.eisenberg at gmail.com
Wed Sep 26 02:47:30 UTC 2018

Please comment on the talk page if you have any suggestions about this

On Mon, Sep 24, 2018 at 11:40 PM Joseph Eisenberg <
joseph.eisenberg at gmail.com> wrote:

> The tag, "prominence=*" has been in use for a number of years, but the
> proposal was abandoned before a vote back in 2009. I have revived the
> proposal and now request your comments and suggestions before bringing
> it to a vote:
> https://wiki.openstreetmap.org/wiki/Proposed_features/key:prominence
> "Use the tag prominence=* to specify the Topographic prominence of a
> natural=peak in meters"
> "Topographic prominence is a objective measurement of how significant
> a peak is. For example, lists of tallest mountains use a minimum
> prominence cutoff of 100, 200 or 300 meters to define an independent
> peak. In general, all peaks with very high prominence (over 1500
> meters) are important mountains. But not all important peaks have high
> prominence."
> "Prominence might be used to select peaks for rendering, or to select
> significant peaks for analysis by database users. A scheme which can
> work both for Denmark and Switzerland, would be: If too many peaks are
> present within a particular area of the map at a certain zoom level,
> select the ones with highest prominence. Different thresholds might be
> used for when to render a peak symbol only, versus render the peak
> with a name label or elevation."
> "The prominence of a peak is the same as its elevation if it is the
> highest point on a continent or island. All other peaks on the same
> landmass have a prominence that is lower than their elevation, found
> by subtracting the elevation of the lowest saddle (also called the
> "key col") along the ridge that connects to the next higher mountain."
> Wikipedia: http://en.wikipedia.org/wiki/Topographic_prominence
> An introduction to Topographic Prominence
> http://www.peaklist.org/theory/orometry/article/Orometry_1.html
> -Joseph
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