From pull request qgis/QGIS#58483
Author: @nirvn
QGIS version: 3.40
[expression] Add line_interpolate_point_by_m and line_locate_m expressions
PR Description:
Description
This PR adds two new functions to our expression engine to work with M values along line strings:
line_interpolate_point_by_m: returns a point geometry of a matching m value interpolated along a line containing an m dimension.
line_locate_m: returns a distance from the beginning of a line where a matching m value was found.
These two functions coming in extremely handy when working with temporal data, e.g. a linestring representing a GPS track where the M value represents the epoch value.
Using this function alongside of temporal controller makes for beautiful animations that were previously harder to unlock:
Request for documentation
From pull request qgis/QGIS#58483 Author: @nirvn QGIS version: 3.40
[expression] Add line_interpolate_point_by_m and line_locate_m expressions
PR Description:
Description
This PR adds two new functions to our expression engine to work with M values along line strings:
line_interpolate_point_by_m: returns a point geometry of a matching m value interpolated along a line containing an m dimension.line_locate_m: returns a distance from the beginning of a line where a matching m value was found.These two functions coming in extremely handy when working with temporal data, e.g. a linestring representing a GPS track where the M value represents the epoch value.
Using this function alongside of temporal controller makes for beautiful animations that were previously harder to unlock:
https://github.com/user-attachments/assets/8a062173-dbf4-4af4-9173-210cf957820c
Commits tagged with [need-docs] or [FEATURE]