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The process of modelling the elevation surface of a coastal area using the fusion of spatial data from different sensors

Włodarczyk-Sielicka Marta, Bodus-Olkowska Izabela, Łącka Małgorzata

Oceanologia

2022

No. 64 (1)

22--34

Information regarding the depth distribution in a specific aquatic area is not also crucial for the safety of navigation, but also for modelling environmental processes, such as the quick establishment of marine-land boundaries or assessments of flood risk areas. Using elevation data from different available sources can be very convenient for individuals who wish to conduct quick analysis or need to obtain data covering a large area without the need for data collection and surveys. This study proposes a method of combining spatial data from different sources during surface modelling of a coastal area. The spatial data used for elevation surface modelling included hydrographic and topographic data, which are often collected separately for various purposes. Data are saved in different formats with various resolutions and accuracies; thus, a uniform surface model that will allow for easy and accurate analysis is currently lacking. The main aim of this study was to create a model of the surface of a coastal area using input data from various sources with the highest possible accuracy. This paper presents the available spatial data sources for coastal areas, along with the data pre-processing process. Furthermore, spatial data fusion is introduced, along with the results. The entire process of creating the uniform surface model consisted of several steps that are described in detail and visualised. The obtained model was visualised using a three-dimensional map.

Quantitative changes in near-channel landslides caused by fluvial erosion in the light of high-resolution DEM

Cebulski Jarosław

Studia Geomorphologica Carpatho-Balcanica

2022/2023

Vol. 56/57

3--50

The article deals the issue of near-channel landslide activity in two regions (Rożnowskie Foothills and Beskid Niski Mountains) in the Polish Outer Carpathians. The main objective of the research was to determine the volume of material removed from the studied landslides in the period from their occurrence to 2012 and to compare these results with the volume of material removed from landslides during the period of detailed research in 2014–2017. The ALS data was used to prepared to the DoDs analysis DoD analysis with theoretical landslide surfaces and to determine the volume of material removed from the occurrence of landslides to 2012. Detailed TLS surveys (10 measurement series) were carried out from April 2014 to November 2017, resulting in nine Digital Elevation Models (DEMs) of Difference (DoDs), illustrating quantitative and spatial changes within the investigated landslides. It was found that near-channel landslides, under the influence of ongoing fluvial erosion, exhibit continuous activity with varying intensity, depending on the hydrometeorological conditions. During flood events, the movements within the entire landslide area were activated. Conversely, in periods between floods, there was a constant removal of material from the toe of the landslides. During flood events, the material carried away by streams accounted for 60% to 90% of the volume of material removed throughout the research period. The volume of material removed from the landslide in 4 years of survey ranges from 14 to 107% of the material removed from the landslide since its occurrence to 2012.