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An Open-Source Geospatial Framework for Karst Mapping: Integrating GNSS and Quantum GIS (QGIS) for Topographic Reconstruction of the Gunungsewu Karst Region

Authors
Keywords:
QGIS; Gunungsewu Karst; Spatial Mapping; Geoinformatics; Conservation Management.
Abstract

The Gunungsewu Karst Region represents one of Indonesia's most extensive and intricate karst landscapes, characterized by profound geological, ecological, and socio-cultural significance. The complex geomorphological attributes—defined by prominent dolines, cave systems, and subterranean drainage networks—necessitate sophisticated mapping techniques capable of multi-source spatial data integration. This study evaluates the efficacy of Quantum Geographic Information System (QGIS) as a robust, open-source alternative to commercial software for mapping the Gunungsewu karst terrain. The methodology encompasses field-based data acquisition using Global Navigation Satellite Systems (GNSS) and theodolites, followed by coordinate processing and spatial visualization within the QGIS environment through thematic layering, contour analysis, and karst feature extraction. Our findings demonstrate that QGIS effectively synthesizes topographic and geospatial datasets to produce high-resolution morphological maps. The platform exhibits superior capabilities in processing raster-vector synergies and multi-format spatial compatibility. The implementation of this QGIS-based workflow significantly enhances mapping efficiency and the accuracy of karst feature representation, thereby providing a critical framework for the conservation and sustainable management of the Gunungsewu Karst Region.

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Published
2026-05-01
Issue
Vol. 1 No. 01 (2026): Gunungkidul Karst International Conference (GKIC) Proceeding
Section
Articles