You can’t use those Australian maps for Openstreetmap, unless the
government has subsequently released them as public domain.
But In the USA and Canada all official topo maps are public domain (I
linked the licenses from the proposal page). USGS also has maps of the
Arctic and Antarctic.
In
On Fri, 28 Sep 2018 at 15:02, Joseph Eisenberg
wrote:
> and added a description of how the key saddle of a peak can be found by
> looking at a topo map
> with contours.
>
> I also added additional warnings against copying this data from
> wikipedia and other sources which are incompatible with
Fortunately, when you are finding the prominence of a peak, it matters
that the peak and saddle elevations are measured from the same
baseline. But thanks for the reminder abou the EGN96 standard. I
believe this is also what is used on USGS Topo maps and Opentopomap,
which are the sources I
On 2018-09-27 07:17, Graeme Fitzpatrick wrote:
> & when you say survey with GPS, is that accurate enough for an altitude
> reading? With my Garmin GPS (which admittedly is 10 - 15 years old, but
> _wasn't_ a cheap one!), I can calibrate it in the back yard at 6m ASL, go for
> a day trip & when
Javbw
> On Sep 27, 2018, at 2:17 PM, Graeme Fitzpatrick wrote:
>
> How do you determine the height of the saddle / peak?
There is a lot of GIS data available for named points.
Also, there is a lot of topography available as well, so someone manually
mapping certian areas could create a
On Mon, 24 Sep 2018 at 16:06, Joseph Eisenberg
wrote:
>
> That’s why we need to check the height of saddles and peaks “by hand”, or
> better yet by survey with GPS.
>
Joseph, just a technical question, thanks, as I don't understand *any* of
the details of what you're wanting to do! :-)
How do
On 24/09/2018 07:03, Joseph Eisenberg wrote:
Right! Especially on my island, New Guinea.
That’s why we need to check the height of saddles and peaks “by hand”, or
better yet by survey with GPS.
OSM is the right place for this data, and some map styles and database users
will
Wouldn't those who need this information be using a contours overlay?
Cheers
DaveF
On 23/09/2018 01:00, Joseph Eisenberg wrote:
I've been tagging peaks (natural=peak) with the key
prominence=
Prominence is a natural feature...
___
Tagging mailing
Right! Especially on my island, New Guinea.
That’s why we need to check the height of saddles and peaks “by hand”, or
better yet by survey with GPS.
OSM is the right place for this data, and some map styles and database
users will find it useful to analyze data about mountain areas and peaks.
I don't see no issue in mapping prominence for those interested in.
Just to mention for the sake of the discussion that 'sufficiently accurate DEM'
doesn't exists globally.
Yves ___
Tagging mailing list
Tagging@openstreetmap.org
On Sun, Sep 23, 2018 at 9:29 PM Bill Ricker wrote:
> This all seems like highly specialized, technical data that is not of
> general interest, as no one but peak-baggers understand the technical
> definition. Many map users seeing this prominence=999m factoid would
> jump to the incorrect
On Mon, Sep 24, 2018, 9:29 AM Bill Ricker, wrote:
> Is the OSM primary DB the right repository for this?
> Have we accepted being the repository for everything that anyone wants to
> map?
> (I don't remember hearing a change from "no".)
>
If people are already mapping whether an amenity=fuel is
This all seems like highly specialized, technical data that is not of
general interest, as no one but peak-baggers understand the technical
definition. Many map users seeing this prominence=999m factoid would
jump to the incorrect conclusion that it was relative to where the
(lower of the)
On Sun, Sep 23, 2018 at 5:40 PM Joseph Eisenberg
wrote:
> Yes, “prominence” here is a technical term that has only a partially
> connection to the subjective “importance” of a peak.
>
> In general, all peaks with high topographic prominence are considered
> important by local people (if anyone
Mf
Fly
Henry
H
Rhmmm
On Mon, Sep 24, 2018 at 6:38 AM Joseph Eisenberg
wrote:
> Thanks Kevin
> Yes, “prominence” here is a technical term that has only a partially
> connection to the subjective “importance” of a peak.
>
> In general, all peaks with high topographic prominence are considered
Thanks Kevin
Yes, “prominence” here is a technical term that has only a partially
connection to the subjective “importance” of a peak.
In general, all peaks with high topographic prominence are considered
important by local people (if anyone lives near them) and mountain
climbers, but some peaks
On Sun, Sep 23, 2018 at 9:34 AM Michael Reichert wrote:
> (1) If you assume the earth to be a plane, just order the peaks by their
> elevation. It's so simple that I don't give the necessary SQL query
> here. If we used a prominence=* key, it would have to be the distance to
> the next higher
Hi Joseph,
Am 23.09.18 um 02:00 schrieb Joseph Eisenberg:
> Elevation and prominence can both be calculated from SRTM data, eg by
> using Opentopomap tiles and finding the highest contour lines around a
> peak, and the lowest near a saddle.
>
> Prominence and elevation can be calculated by
I don't think OSM can use wikipedia as a source?
Something about incompatible licences.
How to calculate prominence will need to documented in OSM rather than refer to
wikipoedia.
On 23/09/18 11:04, Joseph Eisenberg wrote:
For most peaks, it's only necessary to know the elevation of the
Edi & change status, I would say. Seems a pretty clear case, just maybe not
something many mappers or users are very concerned with. But that's not a
problem as long as there is a clear definition, solid data and a steady
group of mappers/users. I would say, just do it and document it.
Op zo 23
For most peaks, it's only necessary to know the elevation of the
nearby saddles and peaks to find the prominence. For example, walk to
the top of the hill and record the elevation. Look around and find any
taller nearby peaks. If there is only 1 taller hill, walk down the
ridge line to the lowest
On 23/09/18 10:00, Joseph Eisenberg wrote:
I've been tagging peaks (natural=peak) with the key
prominence=
Prominence is a natural feature with a use similar to elevation. When
I see ele=*, I know how high the top of the peak is, but not how tall
the peak is compared to the surrounding land.
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