ABSTRACT
Photogrammetry and remote sensing are two indirect methods of obtaining both quantitative and qualitative data about the Earth's surface or other features of interest. Since some debate exists regarding the demarcation between the two subjects, the following br~0ad distinction will be used throughout this chapter. Photogrammetry will beconsidered to be concerned with the scientific methods of obtaining reliable measurements from ground or airborne imagery (primarily photographic) in order to produce a precise representation (graphical or digital) of the feature of interest. Remote sensing, in contrast, will be defined as encompassing those methods of detecting variations in radiant energy from the Earth's surface using airborne or satellite sensors. Interpretation (either visually or using computer techniques) of these recorded patterns is used to create thematic maps. The aim of this chapter will therefore be to: (1) provide an introduction to the fundamental principles of photogrammetry and remote sensing; (2) review the current state of development of instrumentation in both fields; and (3) examine the application of both techniques to problems in civil engineering.
