momepy.elongation

momepy.elongation(geometry)

Calculates the elongation of each object given its geometry.

The elongation is defined as the elongation of the minimum bounding rectangle.

\[{{p - \sqrt{p^2 - 16a}} \over {4}} \over {{{p} \over {2}} - {{p - \sqrt{p^2 - 16a}} \over {4}}}\]

where a is the area of the object and p its perimeter.

Based on [Gil et al., 2012].

Parameters:

geometryGeoDataFrame | GeoSeries

A GeoDataFrame or GeoSeries containing polygons to analyse.

Returns:

Series

Examples

>>> path = momepy.datasets.get_path("bubenec")
>>> buildings = geopandas.read_file(path, layer="buildings")
>>> momepy.elongation(buildings)
0      0.908244
1      0.581318
2      0.726527
3      0.838840
4      0.727294
         ...
139    0.608004
140    0.979998
141    0.747326
142    0.564060
143    0.987953
Name: elongation, Length: 144, dtype: float64