# Introduction

ORIENT is an universal program system mainly intended to do rigorous adjustments in the field of photogrammetric point determination. Many kinds of observations and/or parameters may be treated simultaneously:

- Observations:
- image points (x,y)
- model points (x,y,z)
- polar points (direction, zenith angle, distance)
- object control points (X,Y,Z)
- fictitious observations of geometric gestalts (planes & straight lines, surfaces & curves)

- Parameters:
- transformation (calibration, orientation) parameters
- additional parameters for
- image deformation
- gestalt formation

- modelling of trajectories of scanners (polynomials oder splines)

The program system is designed to handle projects of analytical photogrammetry with utmost mathematical rigourosity. The man-software-hardware communication architecture of ORIENT is shown in figure 1.

The main modules of ORIENT are:

EDIT |
to input data (e.g. measurements) |

UPDATE |
to prospect and/or to change available data |

CREATE |
to create fictitious observations (gestalts) |

PCCORR |
to transform and correct PiCture Co-ORdinates |

ADJUST |
to adjust observations |

CORMAN |
to manage data (CORe MANager) |

CALCULATE |
to calculate directions, distances, polygons etc. from the results of the adjustment |

PLOT |
to graphically output data rooms |

others |
to adapt the level of instructions |

Fig. 1: The communicative architecture of ORIENT

Remark: The figure 1 has been constructed by means of ORIENT's graphics module PLOT.