I want to create a query to select all ways and their nodes that exist within a bounding box using postGIS. The bounding box shall includes all details as osmosis "--bounding-box" command will retrieves.
Is there any way to do that?
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For the osmosis docs, I see the command option:
--bounding-box top=49.5138 left=10.9351 bottom=49.3866 right=11.201
SELECT * FROM mytable WHERE mytable.geom && ST_MakeEnvelope(10.9351, 49.3866, 11.201, 49.5138, 4326);
The SRID 4326 is for WGS84 Lat/Long, and is only required for PostGIS 1.5; it can be omitted for later versions.
I think it will be something like this: The bounding box in PostGIS is created by
ST_GeomFromText('POLYGON((ulx uly, urx ury, llx llr, lrx lry, ulx uly))', <srid>)
The query will use ST_Intersection with a subquery.
SELECT bbox_nodes.id, bbox_nodes.tag, nodes_geom FROM (SELECT nodes.id, nodes.tag, ST_Intersection(nodes.the_geom, ST_GeomFromText('POLYGON((ulx uly, urx ury, llx llr, lrx lry, ulx uly))', <srid> )).geom AS nodes_geom FROM nodes WHERE ST_Intersects(nodes.the_geom, ST_GeomFromText('POLYGON((ulx uly, urx ury, llx llr, lrx lry, ulx uly))', <srid> )) AS bbox_nodes WHERE ST_Dimension(bbox_nodes.nodes_geom)=0;
I more or less took this from The PostGIS help pages
A second query, on the ways table, designed similar to the above (but with ST_Dimension()=1 ) should get the ways.
there is a topic here which similar to your question here...
ST_Intersection — (T) Returns a geometry that represents the shared portion of geomA and geomB. The geography implementation does a transform to geometry to do the intersection and then transform back to WGS84.
1.you can also get some information here about Geometry Constructing Functions.
SELECT ST_AsText(ST_Intersection( ST_Buffer('POINT(0 0)', 2), ST_Buffer('POINT(3 0)', 2) ));
2.Another information here about Intersects Intersection: PostGIS - ST_Intersects, ST_Intersection...
SELECT b.the_geom As bgeom, p.the_geom As pgeom, ST_Intersection(b.the_geom, p.the_geom) As intersect_bp FROM buildings b INNER JOIN parcels p ON ST_Intersection(b,p) WHERE ST_Overlaps(b.the_geom, p.the_geom) LIMIT 1;
i hope it helps you...
This is a comment on @Micha's code.
The coordinate pairs for the
POLYGON should follow a clockwise (or a counter clockwise) order : upper left, upper right, lower right, lower left, upper left again.
So, clockwise, the function call should be :
ST_GeomFromText('POLYGON((ulx uly, urx ury, lrx lry, llx llr, ulx uly))', <srid>)
Or counter clockwise :
ST_GeomFromText('POLYGON((ulx uly, llx llr, lrx lry, urx ury, ulx uly))', <srid>)