@article{MTMT:34847884,
	title = {Improving Urban Mapping Accuracy: Investigating the Role of Data Acquisition Methods and SfM Processing Modes in UAS‑Based Survey Through Explainable AI Metrics},
	url = {https://m2.mtmt.hu/api/publication/34847884},
	author = {Nagy, Loránd Attila and Szabó, Szilárd and Burai, Péter and Bertalan, László},
	doi = {10.1007/s41651-024-00179-z},
	journal-iso = {Journal of Geovisualization and Spatial Analysis},
	journal = {Journal of Geovisualization and Spatial Analysis},
	volume = {8},
	unique-id = {34847884},
	issn = {2509-8810},
	abstract = {In this study, we investigated the accuracy of surface models and orthophoto mosaics generated from images acquired using different data acquisition methods at different processing levels in two urban study areas with different characteristics. Experimental investigations employed single- and double-grid flight directions with nadir and tilted (60°) camera angles, alongside the Perimeter 3D method. Three processing levels (low, medium, and high) were applied using SfM software, resulting in 42 models. Ground truth data from RTK GNSS points and aerial LiDAR surveys were used to assess horizontal and vertical accuracies. For the horizontal accuracy test, neither the oblique camera angle nor the double grid resulted in an improvement in accuracy. In contrast, when examining the vertical accuracy, it was concluded that for several processing levels, the tilted camera angle yielded better results, and in these cases, the double grid also improved accuracy. Feature importance analysis revealed that, among the four variables, the data acquisition method was the most important factor affecting accuracy in two out of three cases.},
	keywords = {accuracy assessment; UAS-SfM; data acquisition types; oblique imaging; flight directions},
	year = {2024},
	eissn = {2509-8829},
	orcid-numbers = {Szabó, Szilárd/0000-0002-2670-7384; Bertalan, László/0000-0002-5963-2710}
}

@article{MTMT:34839516,
	title = {Aquatic vegetation mapping with UAS-cameras considering phenotypes},
	url = {https://m2.mtmt.hu/api/publication/34839516},
	author = {Szabó, Loránd and Bertalan, László and Szabó, Gergely and Grigorszky, István and Somlyai, Imre and Dévai, György and Nagy, Sándor Alex and Holb, Imre and Szabó, Szilárd},
	doi = {10.1016/j.ecoinf.2024.102624},
	journal-iso = {ECOL INFORM},
	journal = {ECOLOGICAL INFORMATICS},
	unique-id = {34839516},
	issn = {1574-9541},
	abstract = {Aquatic vegetation species at the genus level in an oxbow lake were identified in Hungary based on a multispectral Uncrewed Aerial System (UAS ) survey within an elongated oxbow lake area of the Tisza River under continental climate. Seven and 13 classes were discriminated using three different classification methods (Support Vector Machine [SVM], Random Forest [RF] , and Multivariate Adaptive Regression Splines [MARS]) using different input data in ten combinations: original spectral bands , spectral indices, Digital Surface Model (DSM) , and Haralick texture indices. We achieved a high (97.1%) overall accuracies (OAs) by applying the SVM classifier, but the RF performed only <1% worse, as it was represented in the first places of the classification rank before the MARS. The highest classification accuracies (>84% OA) were obtained using the most important variables derived by the Recursive Feature Elimination (RFE) method . The best classification required DSM as an input variable. The poorest classification performance belonged to the model that used only texture indices or spectral indices. On the class level, Stratoites aloides exhibit the lowest degree of separability compared to the other classes. Accordingly, we recommend using supplementary input data for the classifications beside s the original spectral bands, for example , DSM, spectral , and texture indices, as these variables significantly improve the classification accuracies in the proper combinations of the input variables .},
	year = {2024},
	eissn = {1878-0512},
	orcid-numbers = {Szabó, Loránd/0000-0001-7105-715X; Bertalan, László/0000-0002-5963-2710; Szabó, Szilárd/0000-0002-2670-7384}
}

@CONFERENCE{MTMT:34799801,
	title = {Evaluating the efficacy of multitemporal TLS and UAS surveys for quantifying wind erosion magnitudes of sand dune topography},
	url = {https://m2.mtmt.hu/api/publication/34799801},
	author = {Bertalan, László and Négyesi, Gábor and Szabó, Gergely and Túri, Zoltán and Szabó, Szilárd},
	booktitle = {EGU General Assembly 2024},
	unique-id = {34799801},
	year = {2024},
	orcid-numbers = {Bertalan, László/0000-0002-5963-2710; Szabó, Szilárd/0000-0002-2670-7384}
}

@article{MTMT:34476689,
	title = {Impact of the El Niño on Fire Dynamics on the African Continent},
	url = {https://m2.mtmt.hu/api/publication/34476689},
	author = {de Oliveira-Júnior, José Francisco and Mendes, David and Szabó, Szilárd and Singh, Sudhir Kumar and Jamjareegulgarn, Punyawi and Cardoso, Kelvy Rosalvo Alencar and Bertalan, László and da Silva, Marcos Vinicius and da Rosa Ferraz Jardim, Alexandre Maniçoba and da Silva, Jhon Lennon Bezerra and Lyra, Gustavo Bastos and Abreu, Marcel Carvalho and Filho, Washington Luiz Félix Correia and de Sousa, Amaury and de Barros Santiago, Dimas and da Silva Santos, Iwldson Guilherme and Maksudovna, Vafaeva Khristina},
	doi = {10.1007/s41748-023-00363-z},
	journal-iso = {EARTH SYST ENVIRON},
	journal = {EARTH SYSTEMS AND ENVIRONMENT},
	volume = {-},
	unique-id = {34476689},
	issn = {2509-9426},
	abstract = {Several studies investigated the occurrence of fires in Africa with numerical modeling or applied statistics; however, only a few studies focused on the influence of El Niño on the fire risk using a coupled model. The study aimed to assess the influence of El Niño on wildfire dynamics in Africa using the SPEEDY-HYCOM model. El Niño events in the Eastern Tropical Pacific were classified via sea surface temperature (SST) anomaly based on a predefined climatology between 1961 and 2020 for the entire time series of SST, obtaining linear anomalies. The time series of the SST anomalies was created for the region between 5° N and 5° S and 110° W and 170° W. The events were defined in three consecutive 3-month periods as weak, moderate, and strong El Niño conditions. The Meteorological Fire Danger Index (MFDI) was applied to detect fire hazards. The MFDI simulated by the SPEEDY-HYCOM model for three El Niño categories across different lagged months revealed relevant distinctions among the categories. In the case of ‘Weak’, the maximum variability of fire risk observed at time lags (0, -3, -6, and -9 months) was primarily in Congo, Gabon, and Madagascar. The ‘Moderate’ pattern had similar characteristics to ‘Weak’ except for the lag-6 months and its occurrence in the equatorial zone of Africa. ‘Strong’ showed a remarkable impact in East Africa, resulting in high fire risk, regardless of time lags. Precipitation and evaporation simulations (SPEEDY-HYCOM) indicated that El Niño categories in Africa need particular attention in the central, southern, and southeastern regions emphasizing the significance of lag-0 and lag-6 (evaporation) as well as lag-0, lag-6, and lag-9 (precipitation). The SPEEDY-HYCOM coupled model in conjunction with the MFDI was efficient in assessing climate variabilities in Africa during El Niño events. This model allows the analysis and prediction of wildfire risks based on El Niño events, providing crucial information for wildfire management and prevention. Its simulations uncover significant variations in risks among different El Niño categories and lagged months, contributing to the understanding and mitigation of this environmental challenge.},
	keywords = {fire risk; Coupled modelling; El Nino categories; SPEEDY-HYCOM model},
	year = {2024},
	eissn = {2509-9434},
	orcid-numbers = {Szabó, Szilárd/0000-0002-2670-7384; Bertalan, László/0000-0002-5963-2710}
}

@{MTMT:34735335,
	title = {How Bad Volcano-Clastic Badlands Actually Are?},
	url = {https://m2.mtmt.hu/api/publication/34735335},
	author = {N., Antić and M., Kašanin-Grubin and Bertalan, László and V., Gajić and L., Kaluđerović and N., Mijatović and B., Jovančićević},
	booktitle = {23rd European Meeting on Environmental Chemistry, EMEC23, Book of abstracts},
	unique-id = {34735335},
	year = {2023},
	pages = {22},
	orcid-numbers = {Bertalan, László/0000-0002-5963-2710}
}

@CONFERENCE{MTMT:34524988,
	title = {Badlands involcano-clastic rocks: examplesfrom Serbia and Hungary},
	url = {https://m2.mtmt.hu/api/publication/34524988},
	author = {Antić, Nevena and Bertalan, László and Stefanović, Milica and Kašanin-Grubin, Milica},
	booktitle = {EUGEO},
	unique-id = {34524988},
	abstract = {Badlands can develop under different climatic conditions ranging from arid to humid on materials that have a specific combination of physico-chemical properties depending on their mineralogical composition. Mostly these materials are fine-grained terrigenous, lacustrine or marine sediments of different age. However, badlands can also form in volcano-clasitc materials, and Cappadocia badlands in Turkey is the most prominent example. Less known in the literature are two sites also developed in this type of sediments: Đavolja Varoš, on Radan Moutain in SE Serbia and the Kazár badlands in NW Hungary. The Đavolja Varoš badlands, 0.7 km2 in size is formed by the intensive development of rills and gullies on slopes built from thick volcano-clastic material. The initial relief is reduced only to sharp ridges between adjacent gullies. This badland is developed in dacito-andesitic poorly-consolidated poorly-sorted tuffs. The weathering processes are intense and governed by high intensity precipitation and prolonged drying periods. The reddish earth pyramids built of these erodible materials are protected by the cap rock. Loss of balance and fall of the protective cap rock accelerates the erosion. The smaller Kazár badlands covering the area of 1ha are developed in rhyolitic poorly-consolidated highly porous tuffs. Rills and gullies are the dominant geomorphic processes and the weathering is dominated by freeze-thaw processes. At the Kazár badlands earth pyramids are not protected with the cap rock and weathering, disintegration and sheet wash erosion intensively shape the landscape. Although the materials differ slightly in composition, both being poorly sorted, clay-size rich materials make them sensitive to erosion, proving once more the importance of material composition, in this case namely grain size including sorting and mineralogical composition, for badlands development and future evolution.},
	year = {2023},
	orcid-numbers = {Bertalan, László/0000-0002-5963-2710}
}

@inproceedings{MTMT:34023203,
	title = {Holtágak UAV-alapú felmérésének lehetőségei multispektrális kamera alkalmazásával},
	url = {https://m2.mtmt.hu/api/publication/34023203},
	author = {Szabó, Loránd and Bertalan, László and Szabó, Gergely and Szabó, Szilárd},
	booktitle = {Az elmélet és gyakorlat találkozása a térinformatikában XIV. : Theory meets practice in GIS},
	unique-id = {34023203},
	abstract = {This study discusses the importance of wetland habitats in maintaining hydrological cycles, providing ecological value, and serving as a natural habitat for endangered species. These habitats include oxbow lakes, which are formed by river bends and serve as unique habitats for various plant and animal species. The distribution of these species may depend on direct contact with the river and seasonal flooding events. Oxbow lakes are sensitive to environmental factors, including sedimentation and human activities, which can affect their lifespan and contribute to eutrophication. Remote sensing is a useful tool for studying these habitats, as they can be difficult to access for field surveys. However, existing satellite data may not have high enough spatial resolution for detailed mapping of smaller oxbow lakes, necessitating the use of aerial or unmanned aerial vehicle (UAV) surveys. UAVs offer a more cost-effective and efficient alternative to traditional aircraft surveys, with the potential to capture high-resolution data over smaller areas. We introduced a case study and conducted a UAV survey of the Rakamazi Nagy-morotva oxbow lake. Our goal was to identify the aquatic vegetation on genus-level in a study area using a multispectral UAV camera. Based on our research, we recommend using additional input datasets, such as digital surface models, spectral and texture indices, in addition to spectral bands for classification, as the appropriate combinations of these input variables can significantly improve classification accuracy.},
	year = {2023},
	pages = {269-273},
	orcid-numbers = {Szabó, Loránd/0000-0001-7105-715X; Bertalan, László/0000-0002-5963-2710; Szabó, Szilárd/0000-0002-2670-7384}
}

@CONFERENCE{MTMT:33678059,
	title = {Multi-temporal UAS surveys for reconstructing soil water content of ploughland plots through multispectral and thermal infrared imagery},
	url = {https://m2.mtmt.hu/api/publication/33678059},
	author = {Bertalan, László and Pataki, Angelika and Nagy, Loránd Attila and Négyesi, Gábor and Szabó, Szilárd},
	booktitle = {EGU General Assembly 2023: Abstracts},
	doi = {10.5194/egusphere-egu23-11235},
	unique-id = {33678059},
	year = {2023},
	orcid-numbers = {Bertalan, László/0000-0002-5963-2710; Szabó, Szilárd/0000-0002-2670-7384}
}

@article{MTMT:33657250,
	title = {Cost-benefit analysis of remote sensing data types for mapping mosquito breeding sites},
	url = {https://m2.mtmt.hu/api/publication/33657250},
	author = {Kenyeres, Zoltán and Bauer, Norbert and Bertalan, László and Szabó, Gergely and Márkus, András and Sáringer-Kenyeres, Tamás and Szabó, Szilárd},
	doi = {10.1007/s41324-023-00511-7},
	journal-iso = {SPAT INF RES},
	journal = {SPATIAL INFORMATION RESEARCH},
	volume = {31},
	unique-id = {33657250},
	issn = {2366-3286},
	abstract = {Environmentally friendly biological mosquito control by Bacillus thuringiensis var. israelensis formulations needs appropriate breeding maps. The mapping accuracy depends on the quality of the used remote sensing data. Further, the mapping is expected to be cost-efective. Our aim was to study the efect of the quality of various remote sensing data on the applicability of the maps. We depicted larval habitats by manual interpretation in Quantum GIS 3.16.1 software using remote sensing data of SENTINEL, Google Earth, commercial geoTIFF RGB orthophoto, individual unoccupied aerial systems (UAS) RGB, and multispectral mosaics. Based on our results, after classifcation of the target area by sorting, mixed-use of remote sensing data is required to achieve a highly cost-efcient mapping: RGB aerial photographs with 0.5 m per pixel resolution can be used efciently in areas dominated by grassland habitats, while forest areas need customised footage taken by UAS or drones during the foliage-free period (15 cm per pixel resolution, multispectral technique). Our cost-beneft analysis showed that the aim-optimised method could reduce investment to 6-8% and the cost of data collection to 20-50% of the highest budget. This result is signifcant for all participants of biological mosquito control.},
	year = {2023},
	eissn = {2366-3294},
	pages = {419-428},
	orcid-numbers = {Kenyeres, Zoltán/0000-0002-0941-7254; Bertalan, László/0000-0002-5963-2710; Szabó, Szilárd/0000-0002-2670-7384}
}

@{MTMT:33624764,
	title = {Monitoring river channel dynamics by Unmanned Aerial Systems},
	url = {https://m2.mtmt.hu/api/publication/33624764},
	author = {Bertalan, László and Anette, Eltner and Ian, Maddock and Alonso, Pizarro},
	booktitle = {Unmanned Aerial Systems for Monitoring Soil, Vegetation, and Riverine Environments},
	doi = {10.1016/B978-0-323-85283-8.00004-7},
	unique-id = {33624764},
	year = {2023},
	pages = {271-292},
	orcid-numbers = {Bertalan, László/0000-0002-5963-2710}
}