Questions Answered Concerning Orientation Angles, Parameters Related to Structure from Motion Programs

Woolpert Vice President and Chief Scientist Qassim Abdullah answers questions on technical theory and the practical applications of mapping and GIS in his monthly Mapping Matters column for the PE&RS Journal.

In the June 2021 edition, Abdullah responds to a reader’s questions that concern orientation angle information and exterior orientation parameters as they relate to Structure from Motion (SfM) programs.

“SfM-based software provides more flexibility in dealing with imagery that does not have absolute georeferencing information to start with, as compared to the traditional photogrammetric approach where you need at least an approximate camera position and orientation.”

Abdullah's column is below, courtesy of PE&RS. For more from PE&RS, visit