Presentation

Large-scale geomorphological mapping: fieldwork vs. GIS – examples from Slovenia

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Room H
Schedule:
Tuesday, 1 September 2015
08.30 – 10.15
Keywords:
karst, fluviokarst, geomorphological mapping, GIS, Lidar, landform classification

The aim of our research was to compare the results of large-scale field-based geomorphological mapping and results obtained by the use of geoinformatic tools. Most studies on semi-automated geomorphological mapping focus on medium- or small-scale geomorphological maps, however not many focus on large-scale maps. The basic question was whether GIS-based geomorphological mapping is suitable for creating detailed geomorphological maps. In this study field-based geomorphological mapping was conducted at the scale of 1: 5000. Two geoinformatic methods were used in computer analysis. Firstly, original digital elevation model (DEM) and smoothed DEM were compared; in this way concave and convex areas were defined. Later on landforms on the basis of Surface Specific Points method were defined. Both analyses were conducted with 12.5 m and 1 m DEM.

In Slovenia different geomorphic systems are present (e.g. glacial, fluvial, karst). The analysis was conducted on selected examples where karst, fluviokarst and fluvial processes interact and therefore a variety of landforms is present. In our presentation we are focusing on the investigation of concave landforms.

Comparison of the methods revealed that results obtained with both geoinformatic tools are only partially useful when creating large-scale geomorphological maps. The software we used cannot define such a range of landforms as human interpretation with field work.

The paper is a part of PhD studies focused on geomorphology of karst on contact between limestone and dolomite bedrock.

Petra Gostinčar
Karst Research Institute ZRC SAZU
Slovenia
petra.go [at] gmail.com
Rok Ciglič
Anton Melik Geographical Institute ZRC SAZU
Slovenia
rok.ciglic [at] zrc-sazu.si

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