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I have layer of points that correspond to a layer of lines. I need to find the distance from the beginning and end point of the line to the corresponding point. I used line_locate_point to get the distance from the start point but I can not figure out how to calculate the distance from the end point. Here's what I have for the start point.

line_locate_point(geometry:=geometry(get_feature('path','Jct_ID',"Point Code")),point:=$geometry)

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  • That's just line length minus distance to start point.
    – geozelot
    Aug 31, 2021 at 19:23

1 Answer 1

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Calculate Distance of whole line - distance from the start point (pseudocode) - use this expression:

length (geometry(get_feature('path','Jct_ID',"Point Code")))-
line_locate_point(geometry(get_feature('path','Jct_ID',"Point Code")),$geometry)

or, alternatively (where line 3 contains the expression for the line):

with_variable (
    'line',
    geometry(get_feature('path','Jct_ID',"Point Code")),
    length(@line) - line_locate_point(@line,$geometry))
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  • Elegant and simple. It didn't occur to me to just subtract the length. Thank you very much.
    – brink
    Aug 31, 2021 at 21:47

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