Overpass ST_PointOnSurface

There are an Overpass option or workaround to obtain ST_PointOnSurface()-equivalent instead the usual centroid?

It is important to "area relations" (and welcome similar behaviour with ways). It returns the centroid or, when is not inside the surface, returns a point (a projection from centroid) that is guaranteed to lie on the surface.

overpass

asked 14 Aug '18, 15:13

ppKrauss
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accept rate: 0%

edited 14 Aug '18, 15:19

I'm not sure, but maybe here is something that you could use:

http://gis.19327.n8.nabble.com/Overpass-API-Overpass-QL-center-and-centroid-function-td5812491.html

(14 Aug '18, 15:34) kocio

Thanks @kocio. As we see in the discussion ,there are a lack of formal specification... Perhaps I need only to check what the Overpass command center is doing: is the PostGIS ST_Centroid() or the ST_PointOnSurface()? ... When I check wiki/Overpass_API/Overpass_QL it says "center: ... The center point is not guaranteed to lie inside the polygon". If the Wiki is correct, my question ("there are a workaround?") make sense.

(14 Aug '18, 15:46) ppKrauss

I hope one of these can help you:

https://wiki.openstreetmap.org/wiki/Overpass_API https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_API_by_Example https://wiki.openstreetmap.org/wiki/Overpass_API/Language_Guide https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL

(14 Aug '18, 15:54) kocio

Hi @kocio, I checked before about center, there are nothing. Only say that center is not the solution (and is not a centroid, is only a BBOX center). All links seems to say nothing about "center alternative".

(14 Aug '18, 16:04) ppKrauss

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question asked: 14 Aug '18, 15:13

question was seen: 728 times

last updated: 14 Aug '18, 16:05

Overpass ST_PointOnSurface

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