|Also available as an Acrobat File|
The Application of Digital Photogrammetric Techniques and Aerial Photography to
the Preservation of Archaeological Detail.
3.5 Generation of the Digital Terrain Model, Orthophoto and Perspective Scene for the Copney Site using 1:10000 scale imagery
The DPW's Automatic Terrain Extraction Feature was used to produce a digital terrain model for the Copney section of the images. The digital terrain models may be generated at a range of accuracies, controlled by the selection of post spacing by the user. A dense post spacing (say 1m) will produce a very detailed and accurate three dimensional model of the terrain. The DTM forms the basis of all further processing of the image. It is critical, therefore that this be as accurate a representation of the terrain as possible. Once generated, the DTM is readily storable for further comparison with successively generated DTM's of the same area to allow determination of change in the area through time. Furthermore, once the DTM is generated, Socet Set allows the user to generate a range of visually dramatic and accurate representations of the site, as well as generating extremely accurate base maps of the site. Some of the features available to the researcher at this point are:
The Perspective Scene module can also be used to generate fly-throughs of the area along specific flight paths and heights to give visitors who cannot access the site some feel for its structure and beauty. Perhaps the most interesting possibility from this technique is the generation of a 3D model that can be added to web sites for remote access to the site. The basis of 3D reconstruction is the provision of images from specific heights and angles of the intended area to be modeled. The Perspective Scene module can provide all of these images from a single set of aerial photographs. Export of images from the system is a simple procedure and can be carried out in most main image formats.
Graphics Multimedia Virtual Environments Visualisation Contents