By Wilfried Linder

Photogrammetry is a technological know-how established know-how with greater than a century of historical past and improvement. in this time, the concepts used to get information regarding items represented in pictures have replaced dramatically from natural optic­ mechanical gear to an absolutely electronic workflow in our days. Parallel to this, the dealing with grew to become more uncomplicated, and so its attainable additionally for non-photogrammetrists to exploit those tools this day. This booklet is mainly written for capability clients that have no photogram­ metric schooling yet want to use the strong features at times or in smaller initiatives: Geographers, Geologists, Cartographers, woodland Engineers who want to come into the attention-grabbing box of photogrammetry through "learning via doing". accordingly, this booklet isn't really a textbook - for extra and deeper the­ ory, there exists much ofliterature, and it is strongly recommended to exploit a few ofthis. a different advice may be given to the latest e-book from KONECNY (2002) for easy thought and the mathematical backgrounds or to the e-book from SCHENK (1999) for the actual state of affairs in electronic photogrammetry. for a fast reference in particular to algorithms and technical phrases see additionally the Photogrammetric advisor from ALBERTZ & KREILING (1989). This booklet contains a CD-ROM which incorporates all you would like from software program and information to benefit in regards to the quite a few tools from the start (scanning of the pho­ tos) to ultimate items like ortho photographs or mosaics.

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If the orientations of our two images would be exact, then each individual object point within the model area together with both projection centres should form a so-called epipolar plane (see figure 1). In particular, this means that the intersection points of the projection rays [object point -7 projection centre -7 film plane] are homologous; there are no y parallaxes. But, as you remember, nothing is exact in real life! And indeed, due to the geometrical situation of the scanner or the CCD sensor of a digital camera, geometrical resolution of the image, errors in the fiducial marks and control point co-ordinates as well as their measurement results and other influences, usually even in a completely oriented model we will have y parallaxes of some pixels.

But not only this: In between, a lot of calculations and logic tests were carried out, and this is a good place to explain some of them in addition with a bit of theory. 5 and figure 1, after the orientation of our two images we have reconstructed the complete geometry. This means that if we have three-dimensional object (terrain) co-ordinates of a point inside of the model area it is possible to calculate the pixel co-ordinates of this point in the left and the right image using the well-known collinearity equations (for instance see ALBERTZ & KREILING 1989).

A protocol window appears showing each imported image. After the last file is processed, the window will be closed. Remark: For these import routines, parts of the FREEIMAGE library are used. Several tests have shown that the import may fail in older semi-professional operating systems like MS Windows 95 /98, but work properly in MS Windows NT / 2000/XP. 1 Project definition To work with the LISA programmes, it is necessary first to define a project or to select one already existing. All projects which we will use during the following tutorials are prepared and have been copied onto your computer in the installation process.

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