Creating LINESTRING from two POINT(s) and finding mid-POINT

Question

I would like to create a LINESTRING from two POINT geometries and then determine the mid-POINT. So, from my original Pandas' DataFrame, with "x" and "y" columns, I created the following GeoPandas' DataFrame:

zone_short_edges = 
 id vertex_id fr_point \
1 A1 2 POINT (119.79008 28.35047) 
3 A1 4 POINT (122.85067 44.85106) 
5 A2 1 POINT (138.79141 26.48802) 
7 A2 3 POINT (141.73386 44.89716) 
 to_point seg_length 
1 POINT (122.85067 28.08433) 3.072140 
3 POINT (119.92314 44.71798) 2.930553 
5 POINT (141.92247 26.26168) 3.139230 
7 POINT (138.79141 44.89716) 2.942450 

where fr_point and to_point are dtype = geometry.

Now, I am facing two choices:

1. Create a LINESTRING for each pair and then finding that linestrings midpoint.
2. Finding the midpoint (what I actually want to the possibility to find all the POINT(s) that divide the segment into N segments of equal length).

I tried doing this:

geometry = [xy for xy in zip(zone_short_edges.fr_point, zone_short_edges.to_point)]
LineString([geometry]).wkt

but that was a clear failure.

Any ideas that might put me in the right direction or do I really need to go to my original DataFrame?

Answer 1

Try something like:

import geopandas as gpd
from shapely.geometry import LineString
df['line'] = df.apply(lambda row: LineString([row['fr_point'], row['to_point']]), axis=1) #Create a linestring column
df['midpoint'] = df.apply(lambda row: row['line'].centroid, axis=1) #Find centroid
df.head().to_clipboard()

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