Optimizing Topographic Mapping in Complex Geomorphologies: An Integrated AutoCAD Civil 3D Approach for the Gunungsewu Karst Area

• Abdurrohman Ali

  Universitas Gunung Kidul

  Author

• Sandi Hari Mukti

  Universitas Gunung Kidul

  Author

• Muhamad Kholli Fahtulloh

  Universitas Gunung Kidul

  Author

• Ilkham Ramadhan

  Universitas Gunung Kidul

  Author

• Ferdy Aditya Pamungkas

  Universitas Gunung Kidul

  Author

• Fauzi Nur Ramdhani

  Universitas Gunung Kidul

  Author

• Falerian Riski

  Universitas Gunung Kidul

  Author

• BintarAldi Piscano

  Universitas Gunung Kidul

  Author

• Askia Zahra Putri Arofik

  Universitas Gunung Kidul

  Author

• Alif Agung Nugroho

  Universitas Gunung Kidul

  Author

• Alauddin Ali Ahmadi

  Universitas Gunung Kidul

  Author

• Adji Pangestu

  Universitas Gunung Kidul

  Author

• Setyo Nugroho

  Universitas Gunung Kidul

  Author

Karst landscapes, characterized by extreme topographic irregularities and subterranean complexities, present significant challenges for traditional geospatial mapping. The Gunungsewu Karst area, a UNESCO Global Geopark, requires high-precision digital modeling to support conservation and infrastructural planning. This study evaluates the efficacy of AutoCAD Civil 3D in generating high-resolution Digital Terrain Models (DTM) and volumetric analyses within this unique geomorphological context. The methodology integrates terrestrial surveying data and photogrammetric inputs into an automated CAD-based workflow. Advanced surface-creation algorithms—specifically Triangulated Irregular Networks (TIN) and contour interpolation—were utilized to manage the high-density point clouds typical of rugged karst terrains. Geometric accuracy was validated through a comparative analysis of vertical and horizontal Root Mean Square Error (RMSE) values against conventional 2D methods. The findings demonstrate that AutoCAD Civil 3D significantly enhances the visualization of sinkholes, conical hills, and dry valleys with a 25% increase in modeling efficiency compared to standard GIS platforms. The integration of 3D corridors and grading tools allowed for precise volumetric estimations of karst depressions, crucial for hydrological and geotechnical assessments. This research confirms that integrated CAD workflows provide a robust framework for managing complex karst data, offering a scalable solution for geomatic engineers and environmental planners in protected geological sites.

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