Please comment on the talk page if you have any suggestions about this proposal: https://wiki.openstreetmap.org/wiki/Talk:Proposed_features/key:prominence
On Mon, Sep 24, 2018 at 11:40 PM Joseph Eisenberg < [email protected]> 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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