Creating buffer around line segments based on custom values for each line

Question

I have a line shapefile (feature count > 600000) which has three fields: id, geometry, bufferwidth.

Which means, each line has its own buffer width.

How can I create for each feature a buffer with the relevant bufferwidth and store the created polygon? At best, as a result, I would have for each line feature a bufferpolygon within one polygon shapefile. This, as with the buffers I need to fetch point features subsequently.

Is there a way to do this in QGIS or GeoPandas? If not, I would be open to try it with another tool or method.

Hi @Erik Yes, I would like to buffer based on an attribute of the line-object. Thank you for showing the several options of buffering in QGIS, but I couldn't find any of the buffer provide the option to set the buffer width according to a an attribute of a geometry? — i.i.k., Oct 17 '23 at 15:31

BERA · Accepted Answer · 2023-10-17T17:31:14.320

4

You can apply the buffer function like this:

import geopandas as gpd
df = gpd.read_file(r"/home/bera/Desktop/GIStest/bufferlines.geojson")
#df.columns
#Out[3]: Index(['id', 'bufferwidth', 'geometry'], dtype='object')
df["bufferpoly"] = df.apply(lambda x: x.geometry.buffer(distance=x["bufferwidth"]), axis=1)

edited Oct 17 '23 at 17:31

answered Oct 17 '23 at 15:42

BERA

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Creating buffer around line segments based on custom values for each line

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