I wrote a very simple python function that gives me the envelope/bounding box/...based on two coordinate pairs (ower left and upper right corner):

# ...
def get_bounding_box(self, ll_corner, ur_corner):
        from shapely.geometry import MultiPoint
        mp_env = MultiPoint([ll_corner, ur_corner]).envelope
        return ogr.CreateGeometryFromWkt( mp_env.to_wkt() )

print mp_env
POLYGON ((4.8439699999999997 52.3661099999999990, 4.8469199999999999 52.3661099999999990, 4.8469199999999999 52.3706000000000031, 4.8439699999999997 52.3706000000000031, 4.8439699999999997 52.3661099999999990))

As you can see I'm returning an ogr geometry which I use, for instance, in this manner:

bbox = geo.get_bounding_box(lowerleft,upper_right) 
if p.Within(bbox):

Isn't there an equivalent function to shapely's envelope in ogr? Both .ConvexHull() and GetEnvelope() return only the two corner coordinate pairs.


The Ogr function GetEnvelope() returns "a tuple (minX, maxX, minY, maxY)" (from here), but what you want (from what I can understand) is a Polygon describing the envelope/bbox?

This is actually rather simple, as the tuple (minX, maxX, minY, maxY) is all you need to create a Polygon.

Just create a Polygon based these, like so:

from osgeo import ogr

def my_envelope(geom):
   (minX, maxX, minY, maxY) = geom.GetEnvelope()

    # Create ring
    ring = ogr.Geometry(ogr.wkbLinearRing)
    ring.AddPoint(minX, minY)
    ring.AddPoint(maxX, minY)
    ring.AddPoint(maxX, maxY)
    ring.AddPoint(minX, maxY)
    ring.AddPoint(minX, minY)

    # Create polygon
    poly_envelope = ogr.Geometry(ogr.wkbPolygon)
    return poly_envelope
  • Thanks for your answer. So to makes things clear: there is no ogr build-in function that does this? – LarsVegas Mar 19 '14 at 14:12
  • I don't think so – radouxju Mar 19 '14 at 14:16
  • Hi @atlefren, thanks for the code, I've tried to create polygon shapefiles out of this based on my polygon shapefiles. but I can't seem to get it work. any help would be greatly appreciated. – Mehdi Mar 14 '18 at 5:57
  • @Matt "can't seem to get it to work" is a far too vague "question". What does not work? My suggested function? How does it not work? – atlefren Mar 15 '18 at 6:57
  • @atlefren as I said I'm trying to create polygon shapfiles out of my_envelope function you provided above. But it only creates an empty shapefile. Here's the link to the question I've raised. gis.stackexchange.com/questions/274687/… – Mehdi Mar 16 '18 at 0:31

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