[Bill Leach]

I’m seeing some inconsistent display of peaks in BackcountryNavigator and would like to track down the problem. I need an explanation of the rules used in Elevate for rendering peaks. Any assistance would be appreciated.

For example:

<rule e=”any” k=”peak_dist” v=”pd_2″ zoom-max=”13″>
…

Given that k is the key, where does the string “peak_dist” show up? I don’t see it when I display a peak in the OpenStreetMap edit. The renderTheme-reference-1.ods calls it the “1st part of OSM-tag”. However, I see only the tags ele, name, natural and source – no peak_dist.

Similarly, none of the four tags have a value like “pd_2”.

Any advice would be appreciated!

Bill

[mbe57]

Hi Bill,
pd stands for peak dominance, and you willnot find such in OSM data sets. This is preprocessing by Christian, based on Max’ dataset.
And peak elevations in OSM carry a lot of errors, btw.. Did you know that our planet had its highest peak on the Phillipines, 28000+ ?? “Had”, because I turned feet values into meters, as it is required ny OSM rules a few years back.
Why dealing whith dominance? Absent other criteria inside OSM, peak dominance is the most meaningful criteria for relevance that you can get in an automated way.
Hope this helps.
Cheers
Michael

[Bill Leach]

Thanks for that piece, Michael.

Can you tell me any more about the vales for pd? I assume some algorithm was used to determine pd from the elevations and maybe spacing.

Can the values be viewed anywhere? Can the maps be examined with a database browser?

Bill

[Tobias]

You can find everything about this topic in this thread:
https://www.openandromaps.org/en/oam-forums/topic/anzeige-berggipfel-in-elevate-le
It’s in German though.

Here’s the data used for peak dominance:
https://geo.dianacht.de/topo/topographic_isolation_viefinderpanoramas.txt
As you can see there DEM data is used.

Developer of Elevate mapstyle

[Bill Leach]

Thanks Tobias – that is just the information that I wanted.

One other question: how was the dominance mapped to the pd categories: pd_1 through pd_5?

Bill

[Tobias]

Bill Leach wrote:

Thanks Tobias – that is just the information that I wanted.

One other question: how was the dominance mapped to the pd categories: pd_1 through pd_5?

Bill

I think those were the final values:
https://www.openandromaps.org/en/oam-forums/topic/anzeige-berggipfel-in-elevate-le/page/3/#post-20994

Developer of Elevate mapstyle

[Bill Leach]

That’s great. Thanks for helping me understand these styling rules!

Bill

2 users thanked author for this post.

ChristianK, Tobias

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