[Tagging] Orientation of an adit?

Kevin Kenny kevin.b.kenny+osm at gmail.com
Fri Mar 10 21:37:12 UTC 2017

On Fri, Mar 10, 2017 at 2:04 PM, Mike Thompson <miketho16 at gmail.com> wrote:

> On Fri, Mar 10, 2017 at 7:34 AM, Kevin Kenny <kevin.b.kenny+osm at gmail.com>
> wrote:
>> I can just now hear, nevertheless, a chorus asserting that the
>> information is available by other means and therefore does not belong in
>> OSM. An adit or a cave entrance (that isn't a sinkhole) pretty much has to
>> go into a hillside, and a waterfall or a dam flows downhill, so with
>> information about local topography, the direction can be determined.
> In many parts of the world there may not be elevation data with an open
> license of suitable resolution to make this determination for an adit.

Outside the band of 54° S to 60° N, you're certainly right about that.
Within that band, the August 2015 NASA data set is in the public domain and
has coverage at 30 m resolution horizontally. That's probably Not Quite
Good Enough - I get spoilt by the 10 m coverage available for North America.
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