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Nadir & oblique aerial imagery – new possibilities in 3D mapping

Gajski Dubravko, Dzięgielewska-Gajski Katarzyna

GIS Odyssey Journal

2023

Vol. 3, no. 1

137--147

The new generation of aerial photogrammetric cameras brings camera constructions with several fields of view, instead of a traditional vertical one, which, in addition to vertical images, also enable oblique images. Although this imaging method allows higher quality when making a 3D model of the imaged area, it is still not used in Croatia. This paper describes the technology of aerial photogrammetric cameras with multiple fields of view and the advantages of using nadir & oblique aerial imagery, especially in photogrammetric algorithms that allow automated orientation and measurement of images. The tests were performed on nadir and oblique images taken by Vexcel Osprey nadir & oblique camera. Finally, the result obtained only with vertical images was compared with the result with oblique images when making a 3D model of the urban area. Special attention to the quality of modeling of buildings and urban vegetation is drawn and discussed.

Spatial multi-criteria approach to the evaluation of archaeological sites

Magaš Lucija, Gajski Dubravko, Dzięgielewska-Gajski Katarzyna

GIS Odyssey Journal

2021

Vol. 1, no. 1

21--35

One of the most demanding and challenging tasks for an archaeologist is discovering new archaeological deposits. The archaeologist considers many historical facts and explores their interconnectedness and impact on ancient life. The surrounding has the most significant impact on the life of the human community. Therefore ancient communities inhabit such places that provide them with favorable conditions for life and development, i.e., adequate climate, proximity to water, food and raw materials, and the possibility of protection from enemies. To draw the attention of the archaeologists to the areas where spatial conditions are fulfilled until some level, the spatial multi-criteria analysis of landscape features can be of great help. This paper aims to evaluate the landscape by the several predefined criteria using the multi-criteria analysis supported by Analytical Hierarchical Process (AHP). Finally, the evaluation result is visualized in GIS, showing the places where it is to expect an archaeological deposit. As a study area, the Požega valley was chosen because it represents many archaeological sites dating from the Iron Age. According to the personal preferences, five criteria were selected and ranked: proximity to water, altitude, terrain, slope, proximity to mineral resources, and land use. Five potential sites for archaeological research were identified using multi- criteria analysis in GIS and AHP. Finally, the possibilities of multi-criteria analysis in GIS in archaeological research are presented and discussed.