• Cole, Jeffrey
  University of Maine
  

A system for data collection from aerial photographs developed as a component of a geographic information system is discussed. The system is based on fundamental single image photogrammetric principles. A tablet digitizer is utilized for image coordinate measurement. Camera calibration information is employed in coordinate refinement and transformation algorithms. Photograph orientation parameters are determined utilizing the space resection by collinearity principle. Ground coordinate values are determined employing the space intersection principle, utilizing digital elevation model data.

The system is designed to meet a variety of applications objectives, from collecting data contained on a single aerial photograph with minimal ground control information to compiling data from a complex network of aerial photographs with highly accurate and exhaustive control and elevation information.

In review of the literature, algorithms and techniques employed within the system are discussed. A description of the PHOTOMAP system follows, including design goals and a discussion of the methods employed in the design, development, and implementation processes. In conclusion, system enhancements are proposed. A PHOTOMAP system User's Guide is included as an appendix. The system has been effectively implemented as a component of MeGIS, the University of Maine College of Forest Resources geographic information system.