[josm-dev] Find bus stops along a way

[Paul Hartmann]

On 11/08/2012 08:51 AM, Maarten Deen wrote:
> On 2012-11-08 08:14, Jo wrote:
>> Hi,
>>
>> I want to find all bus stops along a side of the road. So I'm looking for
>> functions in JOSM to:
>>
>> Define a rectangle a few meters to one side of the (section of a) road.
>> Get all nodes within this rectangle as a list.
>>
>> or:
>>
>> Define a polygon with the way as one of its sides and a parallel way x
>> meters away as another side.
>> Get all nodes within this polygon as a list.
>>
>> I've been browsing through the source code, but I can't seem to find
>> suitable functions to accomplish this.
>
> There is a plugin: download_along. It is rather crude, but effective.
> You can download objects within 5000, 500 and 50 meters of one or more
> selected objects, with a maximum area of 20, 10, 5 or 1 km^2 per request.
> JOSM (the api) can only download rectangular areas (bbox) so it will
> divide the area you request into these smaller areas to download.
> Obviously you would want the lowest settings for your use. It will
> download in multiple sets, but because it's all automated you can get
> coffee while it's working.
>
> There are suggestions for API v0.7 to extend downloading to arbitrary
> areas, but these seem to be centered on downloading objects that are
> within an already existing structure, not arbitrary polygons. Not sure
> it that would be difficult to program, but I'm adding it to the list at
> <http://wiki.openstreetmap.org/wiki/API_v0.7>

With Roland's Overpass API you can download Polygon areas [1], so it 
would be interesting, to combine those features:
   * Add API for polygon download to mirrored_download plugin.
   * In download_along plugin, check if mirrored_download is present and 
offer mirror option.
I would expect considerable speed-up for the download.

[1] <http://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL#By_Polygon>

Paul