Assigns a chainage value (PK) to each point from the interpolated M value by its projection onto a calibrated line layer with M geometry (LineStringM/MultiLineStringM).
Note: it does not modify the point geometry; it adds calibration fields to the attributes.
INPUTS
• Point layer to calibrate.
• Calibrated line layer (M) (axis/road centerline).
• M units (m or km).
• Maximum distance: threshold to accept the match (search/projection).
OPTIONS
• Restrict matching by ROUTE_ID: searches only within the point’s route (recommended if there are parallel axes).
↳ Requires specifying the ROUTE_ID field in both points and lines.
• Add ROUTE_ID to output: copies the ROUTE_ID from the matched line.
↳ Requires specifying the ROUTE_ID field in the line layer.
OUTPUTS
• Calibrated points with new fields:
– PK: formatted chainage (km+mmm).
– M: interpolated M value (in the units stored in the geometry).
– DIST_AXIS: distance from the point to the axis (in CRS units).
– INCIDENCE: 0/1 (1 if calibration failed).
– INC_TYPE: reason when INCIDENCE=1.
• Issues (table) (optional): disabled by default; created only if enabled and issues exist.
ISSUES (INC_TYPE)
• INC_BAD_GEOM: empty/invalid/non-point geometry.
• INC_NO_ROUTE: missing or not found ROUTE_ID (when restricting by route).
• INC_NO_M: no segments with usable M values among candidates/on the route.
• INC_TOO_FAR: a projection with M exists, but the distance exceeds the maximum.
• INC_NO_MATCH: could not obtain a valid projection with M.
DETAILS
See the plugin README: Calibrate points