[OSM-talk] Extract an arbitrary polygon from large OSM file

[Frederik Ramm]

Hi,

Ævar Arnfjörð Bjarmason wrote:
> On Tue, Dec 23, 2008 at 6:03 PM, Tanveer Singh <tanveer1979 at gmail.com> wrote:
>> I have a big country OSM.
>> My area of interest is a small part of the same of arbitrary(non
>> rectangular shape)
>> Is there a graphical tool where I can open the country OSM, select the
>> area, and trim the OSM to smaller?
> 
> You can use osmosis for this. but it's not graphical.

If you can open the country OSM in any OSM editor - Merkaartor is more 
likely to work with really large files than JOSM - then you could draw a 
way around the area of interest and save it. Then use the tool 
"osm2poly" from SVN (requires the way to be tagged with polygon_id=1 and 
polygon_filename=mypoly.poly or so), which will then generate a polygon 
file that can be used with the Osmosis --bp task.

If you cannot open the country OSM in any editor then you could still 
open your favourite editor and load a WMS (landsat) background and draw 
the area on top of that, save as .osm and proceed as above.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"