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I'm working off the acceptable licence LPI NSW topo and base map. These contain both spot heights
and true peaks
is this correct tagging form? I feel comfortable that The question isn't should I tag them, they're useful verifiable data for an uninhabited area with significant navigation issues and hazards to life. The question is how ought they be tagged. |
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We don't normally map spot elevations at all (just as we don't map sea depths). Where would you stop? How many spot elevations per square metre would be acceptable? 3
This question comes up often in OSM circles. As Frederick states, under normal circumstances we don't officially map spot heights, but as usual there are exceptions. If that spot is the highest point in an otherwise flat environment it might warrant a node and an elevation tag. However, tagging such a node as a "peak" doesn't seem quite right even then. Yet that is the only possibility available under the currently acceptable OSM tagging scheme. Even the "true peak" you mention in your post is barely a bump compared to most features I would consider peaks.
(06 Apr '16, 07:15)
AlaskaDave
The back of beyond in Australia is far from a normal scenario.
(06 Apr '16, 07:18)
samuelrussell
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In areas where you should map 1
"natural=spot_elevation" is currently only used 7 times worldwide: http://taginfo.openstreetmap.org/tags/natural=spot_elevation Spot heights elsewhere have tended to just use an ele tag: http://taginfo.openstreetmap.org/keys/ele#overview Is there anything "separately worth mapping" about a spot height other than its height? That said, there's definitely a problem in some places (e.g. the UK) with people copying spot heights from out of copyright maps and tagging them as "natural=peak" so that they render on the "standard" map (without survey, so of course some "peaks" are now at the bottom of quarries!). Maybe a tag like this might be a solution to that.
(10 Apr '16, 10:14)
SomeoneElse ♦
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Are you surveying the area, or are you simply copying (or even importing) data from the government data set?
I am simply copying from rendered tiles from our contributor https://wiki.openstreetmap.org/wiki/Contributors#New_South_Wales_Government_data (CC-BY 3.0) cross-referencing two sets of rendered tiles against their imagery and satellite / air imagery. I assume that the LPI's original surveyors had good mapping reason to include the one to two survey heights per square 0.10º. There's occasional satellite / air-mapping of out-buildings, sheds, hedges, but that doesn't go to the
spot_elevationissue.