Viewing 8 posts - 1 through 8 (of 8 total)
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  • #31133

    Juanjo
    Participant

    Hi,
    currently landslides are not rendered in OAM. Would you consider to render them? This can be useful info on the map.

    Regards

    #31143
    Tobias
    Tobias
    Moderator

    Thanks for the suggestion. I’m not sure how this should be rendered, and how much it would be different to typical scree areas in the mountains, but I’ll look into it.

    Developer of Elevate mapstyle

    #31154
    ChristianK
    ChristianK
    Keymaster

    and how much it would be different to typical scree areas

    Todays landslide ist scree from tomorrow.
    Maybe I could transform the landslide to scree

    1 user thanked author for this post.
    #31164

    Juanjo
    Participant

    Hi Tobias, Christian,

    Thank you for looking at this.
    I think that it would be better to not render them as scree (may be with the exception of landslide=rock_fall) because they are a different thing, they are alive.
    For example this one (already mapped in OSM) is not a rock fall but a debris slide. It is there for more than twenty years and it is still slipping, attached is a picture showing it in 2005 and 2017 . There is a hiking path crossing it and it may be dangerous to do so after hard rain periods, one can hear the rocks moving in such case.

    Regards

    Attachments:
    #31167
    Tobias
    Tobias
    Moderator

    I think it’s no problem to add it as a way, as there are only 3800 at the moment.
    It’s just not so easy to find a good rendering for that, and as always if it’s really used how it’s defined – and as it overlaps with scree it can be problematic.
    Looking at that, even “the term scree comes from the Old Norse term for landslide, skriða” (says Wikipedia) :-)
    As far as I understand the definition, only active, current landslides should be mapped, so it’s a kind of temporary thing, which makes sense.
    In contrast: “Historical landslides can be recognised particularly in many mountainous regions such as the Alps. Please do not use this tag for these older events, such as the Flimser Bergsturz. A suggested tag is geological=landslide.”
    And although scree is also a kind of active landslide, the definition says: “Landslide debris fields consisting primary of scree, such as [W] Randa rockslides the Randa Bergsturz should be mapped as natural=scree, perhaps with landslide=rock_fall”.

    Developer of Elevate mapstyle

    #31169
    Tobias
    Tobias
    Moderator

    Oh, 3700 of those are in New Zealand, and are imported data:
    https://wiki.openstreetmap.org/wiki/Contributors#LINZ

    Developer of Elevate mapstyle

    1 user thanked author for this post.
    #31331
    Tobias
    Tobias
    Moderator

    I had a look at the data, I think rendering it outside of New Zealand makes sense, at least for those I checked in the alps. E.g. it helps to choose the right path if you know there’s a landslide on the other one.
    Also there are just 100 mapped outside of New Zealand.
    The NZ import is different – it’s a dataset from 2012, all are lines (and not areas as the Wiki implies) and is defined by “A land mass which has moved”, so probably geological data, which might clutter the map.
    So either:
    – include all landslide ways, and render only areas
    – include landslide, but filter all with LINZ:layer=slip_edge

    Developer of Elevate mapstyle

    #31334

    Juanjo
    Participant

    Hi Tobias,

    if my understanding is correct, filtering out LINZ:layer=slip_edge will remove those from New Zealand, right? If this is the case I am fine with both proposals.
    About the rendering, I think that they should be rendered in a much prominent way than scree.

    Than you again for looking at this.

    Regards

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