While it is a commonpractice to change the scale of the air photo through photographic enlargementor reduction, it is important for the software that you use a photo that hasnot been enlarged or reduced for the photogrametric analyses. * Air Photos: Air photos are taken with special long-focal length cameras.Air photos have an inherent scale to them which is related to the focal lengthof the camera and the height at which the photo is taken. Several important concepts and terms will be important to understandthe analyses described below: In addition, severalflowcharts and checklists are provided to aide in performing the photogrametricanalyses. This document will serve to develop some of the important concepts inphotogrametry, the basics of how the Orthomax software works, and step-by-stepinstructions explaining how to use stereo imagery to extract Digital ElevationModels (DEM) and then orthorectify the imagery. The software package wasoriginally designed by a small company called Autometric however, ERDAS haspurchased the right to distribute the software as an add-in to Imagine.Consequently, Orthomax and Imagine do not always work seamlessly together buttransfer between the two programs is usually problem free. Orthomax is an ERDAS Image add-on program that allows one to performquantitative photogrametry on stereo imagery. Using Orthomax Active Tectonics, Quantitative Structural Geology and Geomorphology
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