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You can use a virtual layer (Layer -> Add Layer --> Add Virtual Layer...) Then import your line layer and your point layer. You must have a common field to join both layers. Than you can write something like that: SELECT -- Interpolate a point on a fraction of the line [0,1] ST_Line_Interpolate_Point( l.geometry, -- locate the ...


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If you just want an indication of where, you can apply a style. Open up the layer property dialog box of your polyline and: Add a new symbol layer. Change symbol layer type to "simple marker". The default should be a series of red nodes. In the style tree select 'Marker Line'. Select "on First vertex only" and insert you distance in the "Offset along line"...



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