A method of producing linear features along a reference-line across a surface for use in a map database is disclosed. In at least one embodiment, the method includes generating, from reference-line data representative of coordinates of the reference-line in a geographic coordinate reference system and source images of the surface adjacent to the reference-line and associated position and orientation data in the geographic coordinate reference system, a reference-line referenced data set, wherein the reference-line referenced data set includes a plurality of sets of image data and associated data defining a reference-line' across a surface in the geographic coordinate reference system, the sets of image data including pixels wherein a set of image data corresponds to an orthorectified view representation of a line section of the surface in the geographic coordinate reference system, each set of image data includes a reference pixel being associated with a position on the reference-line, wherein each pixel represents a surface having a position at a distance from the position of the reference pixel along the line section, and wherein the line section perpendicularly crosses the reference-line at the position associated with the reference pixel; and, post processing the reference-line referenced data set to produce linear features along the reference-line and associated locations in the geographic coordinate reference system for use in a map database.