Is There an Envelope Class in Shapely?
I Found the Envelope Class in Java's Jts Library Very Handy. an Envelope Holds the Minimal and Maximal Coordinates of a Geometry and Is Also Called Bounding...
I found the envelope class in Java's JTS library very handy. An envelope holds the minimal and maximal coordinates of a geometry and is also called bounding box sometimes.
I wanted to get the common envelope of a number of shapely points. In JTS you could call expandToInclude to enlarge the envelope point by point.
As JTS was serving as a blueprint to GEOS / shapely, I was expecting something similar in shapely, but could not find it (I am new to the library though). I know it is no rocket science to do it yourself, but I doubt there is no more elegant way to do this. Do you have any idea?
3 Answers
To create simple box geometries, there is a box function that returns a rectangular polygon:
from shapely.geometry import box
# box(minx, miny, maxx, maxy, ccw=True)
b = box(2, 30, 5, 33)
b.wkt # POLYGON ((5 30, 5 33, 2 33, 2 30, 5 30))
b.area # 9.0
No, there's no envelope class in Shapely, which relies on (minx, miny, maxx, maxy) tuples. If you wanted to program in the same JTS style, it would be trivial to write an envelope class wrapping such a tuple.
Another option:
from shapely.geometry import MultiPoint
print MultiPoint(points).bounds
For anyone coming here, shapely Polygon has now bounds which I believe is equivalent to JTS envelop. Following is the documentation from official page
from shapely.geometry import Polygon
polygon = Polygon([(0, 0), (1, 1), (1, 0)])
polygon.bounds
(0.0, 0.0, 1.0, 1.0)
Its x-y bounding box is a (minx, miny, maxx, maxy) tuple.
Elena Rostova holds a Master's degree in Public Health Journalism. She covers groundbreaking medical research, holistic wellness trends, mental health awareness, and nutritional science.
