At the core of ObliqueMapper™ lies a rigorous set of equations based upon the principles of modern
analytical photogrammetry. The application of mathematical conditions such as coplanarity and collinearity
and the use of bundle block adjustments and least squares minimization ensures that you obtain the best
quality data possible from your photographs.
In photogrammetric terms, every photograph has an internal and external orientation. The internal
orientation establishes the relationship between the individual pixels of the image and the location
of the camera (often called the camera station). The external orientation states the exact position
(x, y, z) and angles (omega, phi, kappa) of the camera in reference to a particular coordinate system (e.g. UTM).
Internal orientation requires detailed information about the camera including the focal length, sensor
size, and lens distortion parameters. Focal length and sensor size are often available in the
specification section of the camera's manual. Lens distortion parameters (e.g. barrell distortion
near edges of the photo) are typically not known, but can be determined through a calibration process
External orientation is determined from additional information provided by the user. Within ObliqueMapper™,
there are two stages to determining the external orientation of each photograph in the project: relative
orientation and absolute orientation.