Ján Šašak

ORCID: 0000-0002-5331-1078
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About
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Research Areas
  • Remote Sensing and LiDAR Applications
  • 3D Surveying and Cultural Heritage
  • Hydrology and Sediment Transport Processes
  • Soil erosion and sediment transport
  • Remote Sensing in Agriculture
  • Flood Risk Assessment and Management
  • Archaeological Research and Protection
  • Urban Heat Island Mitigation
  • Landslides and related hazards
  • 3D Modeling in Geospatial Applications
  • Aeolian processes and effects
  • Geophysics and Gravity Measurements
  • Solar Radiation and Photovoltaics
  • Forest Ecology and Biodiversity Studies
  • Tunneling and Rock Mechanics
  • Geological Modeling and Analysis
  • Karst Systems and Hydrogeology
  • Computer Graphics and Visualization Techniques
  • Geological Formations and Processes Exploration

University of Pavol Jozef Šafárik
2016-2024

Institute of Geography of the Slovak Academy of Sciences
2017-2024

V. B. Sochava Institute of Geography
2016-2019

China University of Mining and Technology
2019

Airborne and terrestrial laser scanning close-range photogrammetry are frequently used for very high-resolution mapping of land surface. These techniques require a good strategy to provide full visibility all areas otherwise the resulting data will contain with no (data shadows). Especially, deglaciated rugged alpine terrain abundant large boulders, vertical rock faces polished roche-moutones surfaces complicated by poor accessibility still challenge. In this paper, we present novel...

10.3390/rs11182154 article EN cc-by Remote Sensing 2019-09-16

Abstract. Urban greenery has various positive micro-climate effects including mitigation of heat islands. The primary root islands in cities is absorption solar radiation by the mass building structures, roads and other solid materials. absorbed subsequently re-radiated into surroundings increases ambient temperatures. vegetation can stop absorb most incoming mostly via photosynthesis evapotranspiration process. However, mild climate Europe manifests considerable annual seasonality which...

10.5194/isprs-archives-xlii-4-w7-7-2017 article EN cc-by ˜The œinternational archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences 2017-10-23

Abstract. High-resolution solar radiation modelling requires the three-dimensional geometric structure of landscape to be respected. Currently, remote sensing methods such as laser scanning and close-range photogrammetry are most commonly used for detailed mapping. The output is 3D models containing buildings, trees, relief other features. raster approach allows modeling energy relief, but it unsuitable objects buildings trees. polygonal features vector mainly designed buildings. Our goal...

10.5194/isprs-archives-xlii-4-w15-35-2019 article EN cc-by ˜The œinternational archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences 2019-09-22

<p>The sediment transport is crucial for maintaining a good ecological condition of the aquatic ecosystem. Moreover, study requires multitemporal and multiscale approaches using more sophisticated tools, such as precise imaging generation novel 3D technology, calculation elevation model, tracer particles analyses, ground-penetrating radar recording, grain size analyses etc. Consequently, transitioning from local to catchment scale, high-resolution topography datasets, main...

10.5194/icg2022-250 preprint EN 2022-06-20

Abstract. Sal ‘e Porcus is the largest natural salt flat in Europe, located Sardinia (Italy) southwest region of Mediterranean area. It spans over an area more than 3.3 square kilometers. Its homogeneity and size characteristics make it a potentially suitable spot for use as satellite sensor calibration/validation site. For this purpose, campaign spectral, mineralogical LiDAR data acquisition has been organized framework dedicated International Remote Sensing Summer School 2023. Furthermore,...

10.5194/isprs-archives-xlviii-3-2024-337-2024 article EN cc-by ˜The œinternational archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences 2024-11-07

Terrain is a dynamic component of the landscape, subject to rapid changes, particularly in scenarios such as landslides. This study investigates how spatial resolution and data structure digital terrain models (DTMs) influence estimation landslide volume changes. We selected formed by undercutting action Belá River Slovakia our research site. Our findings indicate that raster structures, across various resolutions, generally yield more consistent estimates compared 3D mesh structures....

10.3846/gac.2024.20647 article EN cc-by Geodesy and Cartography 2024-12-18

The Smart City concept requires new, fast methods for collection of 3-D data representing features urban landscape. Laser scanning technology (LiDAR - Light Detection and Ranging) enables such approach producing dense point clouds millions points, which, however, contain noise. Therefore, we developed a new allowing semi-automatic elimination noise resulting from motion objects within the scanned scene as persons. We used connected-component labelling method to filter out points terrestrial...

10.33542/gc2019-2-08 article EN Geographia Cassoviensis 2019-01-01

The alpine landscape is rugged, dominated by glacial morphogenesis, comprising specific landforms of different sizes and shapes with a marked vertical relief hierarchical-ordering the forms. Digital geomorphometric analyses such land surface in high level detail can exploit mainly data acquired airborne laser scanning or photogrammetry. However, captured limited to several meters decimetres these datasets for relatively above ground flying heights. Terrestrial (TLS) close range...

10.7287/peerj.preprints.27078v1 preprint EN 2018-07-31

The alpine landscape is rugged, dominated by glacial morphogenesis, comprising specific landforms of different sizes and shapes with a marked vertical relief hierarchical-ordering the forms. Digital geomorphometric analyses such land surface in high level detail can exploit mainly data acquired airborne laser scanning or photogrammetry. However, captured limited to several meters decimetres these datasets for relatively above ground flying heights. Terrestrial (TLS) close range...

10.7287/peerj.preprints.27078 preprint EN 2018-07-31

Abstract. Current climate changes on a global scale require an optimal estimate of heat transfer in complex urban environment as part the requirements for planning conditions smart city. Urban greenery has considerable impact cooling during thermal waves. Sentinel-2 Earth observation mission developed by European Space Agency Copernicus Programme to perform terrestrial observations support various services could become potential means also quantified assessment different scenarios where...

10.5194/ica-abs-1-326-2019 article EN Abstracts of the ICA 2019-07-15
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