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I have a table osm_roads that has a column named geometry geometry geometry(LineString,900913).

If I want to filter a city to draw districts, I cannot do it by geographic coordinates?

What if in openJUMP or QGIS I want to select by bounding box, such a table as that?

Thank you in advance.

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is you osm data in a database? –  Mapperz Jan 29 '13 at 2:36
    
So you need only the districts from osm data? –  Niculita Mihai Jan 29 '13 at 6:47
    
I apologize for not being clear. I have the country imported in PostGIS, but in order to work with a certain city I would only need to add a vector layer filtered, so I don't have to load the other 90% of the country as a layer in QGIS. –  Martin0x777 Jan 29 '13 at 19:02
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1 Answer

up vote 2 down vote accepted

To do the bounding box you need a polygon of the city in the same coordinate system as your current data

USING QGIS

Go to either Vector>Research Tools->Select by location or Plugins>Spatial Query and select the options.

Vector>Research Tools->Polygon from layer extent and make a polygon of the full extent. Then follow the steps in option 1 above using your new polygon.

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