engleski

Application of geographical information system in analysis of stratigraphical unit thickness — A case study of Basic Geological Map of Croatia

Basic Geologic Map of the Republic Croatia at the scale of 1:100 000 consists of 74 sheets. More than seventy mapping geologists, large number of specialists and numerous technical support stuff in various geological disciplines, have participated in map production over a period of 27 years. Map is based on the cronostratigraphical classification (series, systems and eras) except in cases where it was not possible, so more general units have been used. Each sheet consists of schematic geological column showing thickness of mapped units. Thicknesses of each stratigraphical unit were analysed and after that thickness values were stored in the attribute tables of relevant features in the GIS point feature dataset. For each stratigraphical unit specific feature dataset has been created. Each sheet is represented by centroid that contains thickness value of the stratigraphical unit on that sheet. Processing and presentation of the geospatial data was done using GIS software, utilising additional spatial and geostatistical extensions. Analysed data were interpolated by deterministic method – spline interpolation, which provided the best results in this case. After the input data were interpolated in raster grid format, relevant equidistance and colour were chosen for interpretation of each single raster. The results were presented by a series of maps within a GIS project that consists of a total of 35 maps: 18 based on series and 17 maps that comprise of stratigraphical units combined on basis of systems and eras. Maps show thickness of the stratigraphic units and their spatial distribution over the territory of the Republic of Croatia, based on the chronostratigraphical units (series, systems and eras). Such graphical display clearly shows the areas with the highest and lowest thickness of stratigraphic units, the trends of increases and decreases the thickness and the dynamics of sedimentary basin areas.

Basic Geological Map ; Croatia ; GIS ; stratigraphy ; interpolation

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