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Monitoring changes of landscape forms-utilisation of various technology of measurements and development of results (based on the example of cyclic measurements of a migrating dune)

Zaczek-Peplińska J.

Reports on Geodesy

2005

z. 3/74

199-210

Displacement of an object is defined as a change of location of particular elements of that object with respect to a reference system, within a specified period. The above definition is applicable with respect to surveys of engineering objects; interpretation of this definition with respect to changing landscape elements is the reason for various problems and uncertainties. The paper describes issues related to definition of borders of a landscape form and to performance of control measurements. The described form is a migrating dune, which displacements in annual cycles have been determined since the beginning of the eighties. Source materials used for delineation of shape changes of a dune may include various types of measurements: tachymetric, GPS, as wen as measurements performed with the use of aerial and satellite photographs. Following the development of computer graphics technology, as wen as geographic information software, new possibilities anowing to present results of measurements and to perform various types of analyses, have occurred. This allows to perform deep investigations and analyses and to forecast changes which may appear within an investigated area. The paper also describes diversification of displacements and changes of shapes of a migrating terrain form.