Get LineString length in meters

Question

I have a series of LineString that I want to have the length in meters. I use the shapely.geometry module, and importing LineString.

I've seen this post, explaining how to do it, but it seems using Django : Get LineString length in meters (Python, GEODjango)

# Create a line string
>>> line = LineString([(0, 0), (360, 0)])

# Specify srid using [WGS84][1]
>>> line.srid = 4326

# Transform into projected coordinate system (using web mercator)
>>> line.transform(3857)

# Line length. This is zero within numerical precision, because the start 
# point (0, 0) is the same as the end point (0, 360)) on a map.
>>> line.length
>>> 1.1329847282581795e-08

# An example forcing the line through the other side of the world,
# and specifying srid on definition.
>>> line = LineString([(0, 0), (180, 0), (360, 0)], srid=4326)
>>> line.tansform(3857)
>>> line.length
>>> 40075016.6855784

I try to use this post, but it makes me the following error :

'LineString' object has no attribute 'lenght'

IS there any module to import?

Answer 1

Just a point of clarification;
with pyproj 2.6.0 (which is bind to the newest Proj at least in version 6.2.0) you can even use:

from pyproj import Proj, Transformer
import shapely.ops as sp_ops
geom =  # your_shapely_geometry_here
my_transformer = Transformer.from_crs('EPSG:4326', 'EPSG:3857', always_xy=True)
geom_transformed = sp_ops.transform(my_transformer.transform, geom)

You don't need the partial anymore, I mean.

You can check both this and this.

Answer 2

To answer the problem, I finally used this :

line1 = LineString([(0, 0), (180, 0), (360, 0)])
project = partial(pyproj.transform, pyproj.Proj('EPSG:4326'), pyproj.Proj('EPSG:32633'))
line2 = transform(project, line1)
total_lenght = line2.length

and it apparently works.

Answer 3

'LineString' object has no attribute 'lenght'

You might want to try length, not lenght.