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When a GPS lat/lng (coordinates) of a POI for a small house is available, is a good way to add it by creating a node with tag building=house? |
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Area features are better for buildings, even for small buildings. Checking the background imagery, it looks clear enough there to derive a reasonable footprint for the building. Also take a look at building=detached which is similar in meaning to building=house but more specific. Got it – what if a GPS lat/lng is available and it's not feasible to draw a footprint (e.g. because the aerial imagery is not up to date, or there are too many mapped POIs)? Detached indeed seems more specific.
(01 Feb '17, 16:22)
raphaelschaad
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If you think someone would benefit from the nodes being in OSM I think it is fine to add them, I guess I wouldn't put a lot of time into it otherwise. If it is possible to also gather address data for the buildings, that makes the nodes more interesting.
(01 Feb '17, 16:25)
maxerickson
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@raphaelschaad: Keep in mind that there's no such thing as "too many mapped POIs". The ideal end result of the OSM project would be the mapping of EVERY POI (or at least the ones that are suitable for OSM). Don't worry about clutter. Data consumers can decide which POIs they want to use and can ignore less-interesting ones if they want. Not mapping a POI means nobody can use it.
(01 Feb '17, 16:54)
alester
@maxerickson: Got it – the example is a small home in a rural community. The data is useful for humanitarian purposes. There are no addresses. @alester: That's great – I take away that my approach is valid.
(01 Feb '17, 17:01)
raphaelschaad
The wiki page for Key:building indicates a building can be a node or an area, but all the common tags recommend showing the building as an area rather than a node. The tag building=house is also recommended to be drawn as an area but has been shown as a node about 1% of the time. The big advantage with drawing a building as an area is that the building renders as a shaded polygon in OSM, but there is no icon for a building drawn as a node. Many other maps often show buildings as squares, even though they cannot be drawn to scale.
(24 Apr '17, 06:33)
Huttite
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Hi, read this for a node, https://wiki.openstreetmap.org/wiki/Node and these lines for a building, https://wiki.openstreetmap.org/wiki/Buildings And no don’t tag a building as a node, make a rough schets if you see it and add it to OSM or if you’re working out of a chair use a good aerial view. But going outside and have a look is the pleasant part of mapping. You could add a note to specify that it’s not the real outline. schets = sketch? Got it – could you give an example of such a note?
(01 Feb '17, 16:25)
raphaelschaad
note=building needs (local) survey, just like a path or a fence that gets note=unfinished if you cant make a local survey.
(01 Feb '17, 16:47)
Hendrikklaas
Adding this note will be useful, thanks. If I'm in the field and able to make a local survey, how would this be done given it's a ~5x5m hut?
(01 Feb '17, 17:02)
raphaelschaad
It depends on the GPS your using, are you able to make a node ? If so make a node on each corner, clockwise and anti clockwise. By using this method you’re able to eliminate the variation your GPS has with a good result. But if youre working on a HOT project, just draw the building outlines as good as it gets, any building is more the no building at all.
(01 Feb '17, 20:10)
Hendrikklaas
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I add such nodes frequently. My goal is sometimes to show where houses exist in areas of wilderness or other remote areas in Alaska. Taking the trouble to add individual "buildings" by tracing them from aerial imagery is simply too time consuming in many of my areas of interest. I want to show that the homes exist but do not need that level of detail. If someone wants to later edit those nodes and add them as buildings, add addresses, fine.
(02 Feb '17, 00:28)
AlaskaDave
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@Hendrikklaas The project is a HOT-style project. Local health workers acquired one lat/lng per rural home. The buildings are uniform, i.e. if an area feature is needed for me to add them to OSM, it feels appropriate to generate a 6x9m rectangle with the point marker at the center. Is it right that single-node-only features don't show up on the standard OSM map representations? @AlaskaDave Your use case sounds similar to mine: it's more important to have a sense of where buildings are vs. what the exact physical outline of the structure is. How did you go about importing your data? Could you link to an example?
(23 Apr '17, 22:44)
raphaelschaad
Nothing is imported — I use Bing imagery to place those nodes. Below is a link to an area near Caribou Lake in Alaska that contains a bunch of remote homes. My intention is to merely show that the area is populated. IMO, there is no overwhelming need to trace every building. Other mappers may disagree but I have a lot of mapping to do in Alaska. I simply don't have the time to draw these tiny structures while so many of our rivers, lakes and glaciers have yet to be added to OSM. Note the light-grey residential area north of the lake where homes are arranged more like a normal town. Of course, OSM does not render the nodes as homes. In fact, it doesn't render them at all. You will have to download the area with an OSM editor to see them. This settlement is a few miles distant via ATV through treacherous swampland from the nearest county road. http://www.openstreetmap.org/#map=14/59.9022/-151.0575 Cheers, Dave
(24 Apr '17, 00:13)
AlaskaDave
If you want to show an area is populated then landuse=residential should be sufficient. Why waste time adding individual nodes for buildings when they don't render? I would have thought it would be almost as easy to add 4 nodes and have the buildings render as squares, that would be far more informative and avoid the need to download the area with an OSM editor.
(24 Apr '17, 06:43)
Huttite
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Hi, In my opinion what you are doing is fine. You are putting the data on the map. While nodes are not really for buildings, area are more suitable for it, however, if you are mapping using your mobile device or taking the lat long from a GPS device, then you have limited options to draw the actual building and you can use a node instead. But it will be ideal, if you can later revisit the places you mapped and draw the buildings using satellite imagery. Thanks @mmahmud. Is it right that single-node-only features don't show up on the standard OSM map representations though, or am I doing something wrong when browsing to the area using the web interface? (I have to check the box "show data" in order to see the example of OP)
(24 Apr '17, 06:31)
raphaelschaad
If you are plotting the position of a building then walk around it and plot the positions of the 4 corners. This will give you 4 separate GPS samples that can be averaged and give you a more precise location for the building than a single GPS position/point. The 4 points can then be used to draw a square for the building so that it renders on the map.
(24 Apr '17, 06:52)
Huttite
@raphaelschaad : Single node only features do show up on the standard OSM map IF they have amenity tag (amenity=bus_station, ATM etc.) or address (addr:housenumber etc.) on them. But if it is only building=yes, they do not show up. Again, if you are on the go and can only upload node, do that but once you are back into a computer, draw the outlines of the buildings if you can and merge the node details with the buildings. You can find your previous edits from "My Edits" in your OSM profile.
(24 Apr '17, 07:07)
mmahmud
@Huttite That makes sense and I will do that myself going forward. In this case, local health workers acquired a single GPS fix per building. @mmahmud Ok, will do. Unfortunately, the Bing satellite imagery is often outdated and not clear enough to recognize smaller huts. Quick follow up on your comment regarding "if you are on the go and can only upload node" – what software do you use to "upload nodes"? I have the coordinates in GeoJSON or KML.
(24 Apr '17, 08:23)
raphaelschaad
@raphaelschaad : While on the go, I use OSMAnd, OSMTracker but mostly I use Garmin GPS device and take points and later on my computer overlay GPX files on JOSM and add them on the map. You can also try Maps.me and Vespucci app on the go. You can covert your GeoJSON to GPX with this : http://aaronpdennis.github.io/geojson-to-gpx/ And for the imagery, you can try Mapbox or Digital Globe imagery. They are quite clear.
(24 Apr '17, 08:38)
mmahmud
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