Hello Vivien, I develop a 3D renderer working with OSM data, so I will look at your questions based on that background.
Case A: roof:material vs. building:roof The preferred key from 3D rendering documentation is roof:material because, as you guessed, it clearly differentiates this attribute from roof:shape. Based on just the wording of the key, building:roof could be either - so you would have to look it up. Case B: building:walls vs. building:material I'm not sure what building:walls means exactly, I'm not using that tag for rendering so far. But I can clarify the intention with building:material: It's supposed to represent the outer material as seen while mapping on-the-ground. Therefore, "plaster" is a valid value for building:material because that's the outermost layer, even though the entire wall is not made from plaster. If building:walls has the same meaning, then I prefer building:material for the same reason as in Case A. Case C: building vs. building:use I have to agree with you here, the values used for the building key are quite chaotic. But from the original intention as I remember it, I do not think that the two things have the same meaning. For example, a commonly cited example is that a church building which is no longer used as a church and is now a museum (but still looks like a typical church) would be tagged building=church + amenity=museum. Personally, I only use a few hand-picked values from the building key that have a rather clear meaning. As for Case D and the other suggested keys, these are new or seem unrelated to 3D rendering. However, I'm not sure about the exact meaning of your suggested shape:elevation? Tobias On 23.08.2013 18:22, Vivien Deparday wrote: > Hi all, > The OpenDRI project has been doing some work in Nepal and Sri Lanka to > trace building footprints and to enter attribute data about the > buildings. We are looking to get feedback from the tagging and HOT > mailing list on the building presets that we are using and we would like > to consolidate them with the HDM preset [1] and with the rest of the > work done by HOT (e.g. in Indonesia [2]) to make sure it is consistent > to use it with InaSafe [3] or for 3D Modeling [4] or any other applications. > > The presets developed by OpenDRI so far are Nepal [5] and Sri Lanka [6]. > The Nepal presets already received a couple comments from the tagging > list that were applied. > > 1. We have been using 3D building guidelines (although they have a few > contradictory elements), taginfo statistics and looked at a lot of > tagging guidelines on the OSM wiki to create the keys and values but we > didn't really find one general guideline for creating new tags so we > would welcome any feedback on the presets [5] and [6]. > > 2. There are a couple discrepancies: > > Case A: > For the roof material, these keys have been used about the same number > of times: > In wiki gbothuidelines: roof:material= > or > In HDM or Indonesia: building:roof= > It seems like the first option would be better? because it allows to > differentiate with roof:shape ? > > Case B: > For wall material (different from building structure) > In Indonesia: building:walls= > or > In HDM presets: building:material= > building:material is more widely used or do the two tags are meant to be > different? > > Case C: > For building usage, > building= > building:use= > I am not sure what is the best between these two or do they have > different goal/usage? building= seem to be a mix of usage, amenity type, > structure type. > > Case D: > capacity:persons= > occupants= > I suppose they represents two different things: full capacity of a > building vs actual occupancy ? > > > Some other tags that could be added to the HDM: > building:structure > roof:shape > shape:plan > shape:elevation > > If there is some kind of agreement I can create a pull request on the > HDM presets and add some of the new tags we are using too. The detailed > information about the new tags used in the presets will also be added to > pages on the wiki. > > Cheers, > > Vivien > > [1] > _http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Tags/HDM_preset#Building_digitizing_ > > [2] _https://github.com/hotosm/hot-indo/blob/master/bpbd_presets.xml_ > [3] _http://inasafe.org/contents.html_ > [4] _http://wiki.openstreetmap.org/wiki/Simple_3D_buildings_ > [5] _http://visualtags.hotosm.org/collection/10_ (2 notes: the source > tag will be removed from the presets and put on the changesets, > building:start_date => start_date) > [6] _https://www.dropbox.com/s/50blzkwmvxmbbw6/sri_lanka_presets.xml_ > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > http://lists.openstreetmap.org/listinfo/tagging > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
