As is well known, the photogrammetric operations were based on points. During the last 2 decades or so geometric entities such as lines, conic sections, and free-form curves were proposed to replace or to complement the classical point-based photogrammetry. These entities were called collectively Feature-Based Photogrammetry. The use of features in photogrammetry gives a big potential for automation of the photogrammetric data collection and mapping. Now the question is: Do we have enough progress in the area of Feature-Based Photogrammetry on the front of research and applications? What is hampered the progress? Does the complexity of Feature-based photogrammetric models impacted their practical use and implementation? Does the mathematical non-linearity of these models slow their wider adoption and acceptance? Or may be some else.
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