[Tagging] Feature Proposal - RFC - Topographic Prominence

Joseph Eisenberg joseph.eisenberg at gmail.com
Mon Sep 24 14:40:38 UTC 2018


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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