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András Zlinszky

András Zlinszky
Ulyssys Kft

PhD

About

69
Publications
24,571
Reads
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886
Citations
Introduction
I am a remote sensing conservation ecologist, interested mainly in the applications of LIDAR to biodiversity and ecosystem functions/services. Most of my work relates to wetlands, but I have also worked in grasslands and other habitats (at national scale). Other interestes include historic maps, physical geodesy, image classification statistics and eco-geomorphology. I am involved in long-term lake management planning for Lake Balaton, Hungary, and I am interested in other decision support applications of limnology and ecological mapping.
Additional affiliations
May 2015 - present
Eötvös Loránd University
Position
  • External Lecturer
Description
  • Teaching background, basics and applications to BSc/MSc students studying Geophysics and Remote Sensing
October 2013 - May 2019
Hungarian Academy of Sciences
Position
  • Research Associate

Publications

Publications (69)
Article
Full-text available
The verification and monitoring of agricultural subsidy claims requires combined evaluation of several criteria at the scale of over a million cultivation units. Sentinel-2 satellite imagery is a promising data source and paying agencies are encouraged to test their pre-operational use. Here, we present the outcome of the Hungarian agricultural sub...
Article
Full-text available
Mapping and quantifying 3D vegetation structure is essential for assessing and monitoring ecosystem structure and function within wetlands. Airborne Laser Scanning (ALS) is a promising data source for developing indicators of 3D vegetation structure, but derived metrics are often not compared with 3D structural field measurements and the acquisitio...
Article
Full-text available
Mapping vegetation as hard classes based on remote sensing data is a frequently applied approach, even though this crisp, categorical representation is not in line with nature's fuzziness. Gradual transitions in plant species composition in ecotones and faint compositional differences across different patches are thus poorly described in the result...
Article
Full-text available
• Shrub encroachment in seminatural grasslands threatens local biodiversity unless management is applied to reduce shrub density. Dense vegetation of Cytisus scoparius homogenizes the landscape negatively affecting local plant diversity. Detecting structural change (e.g., biomass) is essential for assessing negative impacts of encroachment. Hence,...
Preprint
Full-text available
Easy to use satellite-based water quality visualizations are needed for monitoring and understanding coastal and inland waters, but to date, no publicly accessible real-time global visualization system was in place. Here we introduce the Ulyssys Water Quality Viewer (UWQV), a Sentinel Hub EO Browser Custom script designed for qualitative views of a...
Article
Full-text available
Összefoglaló: A Biológiai Sokféleség és Ökoszisztéma-szolgáltatás Kormányközi Testület (IPBES) négy regionális értékelő tanulmányt készített 2015 és 2018 között. Jelen munkában az Európa és Közép-Ázsia biodiverzitásával és ökoszisztéma-szolgáltatásaival foglalkozó regionális értékelő ta-nulmányt ismertetjük, melyet 118 szerző 4750 információforrás...
Article
Full-text available
Effective planning and nature management require spatially accurate and comprehensive measures of the factors important for biodiversity. LIDAR (Light detection and ranging) can provide exactly this, and is therefore a promising technology to support future nature management and related applications. However, until now studies evaluating the potent...
Article
Full-text available
The quest to decipher the phenotype to genotype relationships involves the quantification of plant adaption to the environment at various scales to solve some of the world's most pressing problems (Bucksch et al., 2017). The role of phenotype to genotype relationships within initiatives to increase crop yields for food, fiber, and fuel and to impro...
Article
Full-text available
Earth observation has rapidly evolved into a state-of-the-art technology providing new capabilities and a wide variety of sensors; nevertheless, it is still a challenge for practitioners external to a specialized community of experts to select the appropriate sensor, define the imaging mode requirements, and select the optimal classifier or retriev...
Article
A recent study by Zlinszky et al.,¹ Zlinszky A, Molnár B, Barfod A. Not all trees sleep the same-high temporal resolution terrestrial laser scanning shows differences in nocturnal plant movement. Front Plant Sci. 8, 1814 (2017).[Crossref], [PubMed], [Web of Science ®] [Google Scholar] uses high-resolution terrestrial laser scanning to investigate t...
Article
Full-text available
A recent study by Zlinszky et al.,¹ Zlinszky A, Molnár B, Barfod A. Not all trees sleep the same-high temporal resolution terrestrial laser scanning shows differences in nocturnal plant movement. Front Plant Sci. 2017;8:1814.[Crossref], [PubMed], [Web of Science ®] [Google Scholar] uses high-resolution terrestrial laser scanning to investigate the...
Article
Wetlands play a major role in Europe’s biodiversity. Despite their importance, wetlands are suffering from constant degradation and loss, therefore, they require constant monitoring. This article presents an automatic method for the mapping and monitoring of wetlands based on the fused processing of laser scans and multispectral satellite imagery,...
Article
Full-text available
Circadian leaf movements are widely known in plants, but nocturnal movement of tree branches were only recently discovered by using terrestrial laser scanning (TLS), a high resolution three-dimensional surveying technique. TLS uses a pulsed laser emitted in a regular scan pattern for rapid measurement of distances to the targets, thus producing thr...
Article
Full-text available
Recent developments in satellite altimetry are leading to improved spatial resolution, allowing applications in the coastal zone and over inland waters. Validation of these sensors near the shore remains a challenge, since the process of upscaling from single point measurements (gauges or GPS buoys) to the radar altimetry footprint is a source of u...
Article
Full-text available
Understandably, given the fast pace of biodiversity loss, there is much interest in using Earth observation technology to track biodiversity, ecosystem functions and ecosystem services. However, because most biodiversity is invisible to Earth observation, indicators based on Earth observation could be misleading and reduce the effectiveness of natu...
Conference Paper
Full-text available
Monitoring ocean chlorophyll and suspended sediment has been made possible using optical satellite imaging, and has contributed immensely to our understanding of the Earth and its climate. However, lake water quality monitoring has limitations due to the optical complexity of shallow, sediment-and organic matter-laden waters. Meanwhile, timely and...
Conference Paper
Full-text available
Biodiversity and ecosystem services are in the focus of biogeosciences research and conservation management worldwide. However, their quantification is notoriously difficult. Since full coverage of biodiversity and/or ecosystem services is unfeasible due to their complexity, indicators are recommended: biophysical quantities that are measureable an...
Conference Paper
Full-text available
Biodiversity and ecosystem services are in the focus of biogeosciences research and conservation management worldwide. However, their quantification is notoriously difficult. Since full coverage of biodiversity and/or ecosystem services is unfeasible due to their complexity, indicators are recommended: biophysical quantities that are measureable an...
Article
Full-text available
Monitoring the water quality of Lake Balaton is an important research field in order to protect and analyze the ecosystem of the water. Currently water quality monitoring is based on a regular bi-weekly in-situ chlorophyll-a measurements in the center of the main basins of Lake Balaton. This monitoring can be expanded by remote sensing methods to p...
Chapter
Full-text available
Lakeshore vegetation, and in general wetlands, are a challenging case for mapping given the inherited complexity of the ecosystems they host and their associated dynamic temporal and spatial nature. Remote sensing has been traditionally a tool for vegetation related studies; however the applications and capabilities it offers are constrained by the...
Chapter
Lakes are important features of the landscape and climate system, and trends and changes in their water quality have been identified as important to monitor within the context of the Water Framework Directive of the European Commission. Phytoplankton form the base of the aquatic food chain and productivity, and also have a major impact on water qua...
Article
Full-text available
This article is based on field measurements on the lake Balaton (Hungary) during the three days: 10, 11, and 12 September 2008. The expedition was performed with the aim to test recently developed ultraviolet (UV) fluorescent portable lidar UFL-8 in natural lake waters and to validate it by contact conventional measurements. We had opportunity to c...
Article
Monitoring the water quality of Lake Balaton is an important research field in order to protect and analyze the ecosystem of the water. Currently water quality monitoring is based on a regular bi-weekly in-situ chlorophyll-a measurements in the center of the main basins of Lake Balaton. This monitoring can be expanded by remote sensing methods to p...
Article
Biodiversity is an ecological concept, which essentially involves a complex sum of several indicators. One widely accepted such set of indicators is prescribed for habitat conservation status assessment within Natura 2000, a continental-scale conservation programme of the European Union. Essential Biodiversity Variables are a set of indicators desi...
Article
Full-text available
Biodiversity is an ecological concept, which essentially involves a complex sum of several indicators. One widely accepted such set of indicators is prescribed for habitat conservation status assessment within Natura 2000, a continental-scale conservation programme of the European Union. Essential Biodiversity Variables are a set of indicators desi...
Article
Full-text available
Instead of assigning every map pixel to a single class, fuzzy classification includes information on the class assigned to each pixel but also the certainty of this class and the alternative possible classes based on fuzzy set theory. The advantages of fuzzy classification for vegetation mapping are well recognized, but the accuracy and uncertainty...
Article
Instead of assigning every map pixel to a single class, fuzzy classification includes information on the class assigned to each pixel but also the certainty of this class and the alternative possible classes based on fuzzy set theory. The advantages of fuzzy classification for vegetation mapping are well recognized, but the accuracy and uncertainty...
Article
Full-text available
The goal of the study was to determine circadian movements of silver birch (Petula Bendula) branches and foliage detected with terrestrial laser scanning (TLS). The study consisted of two geographically separate experiments conducted in Finland and in Austria. Both experiments were carried out at the same time of the year and under similar outdoor...
Data
Animation of the overnight movement in the Finnish birch point cloud from sunset to sunrise. Video is created by drawing birch point cloud of each scan collected during night. The point cloud scanned around sunset (19:40 o'clock) is drawn with black as a reference. The laser scanner was located in origin (0,0).
Conference Paper
Full-text available
In this article the principle of laser scanning is recapitulated starting from the LiDAR equation and the measurement possibilities, especially beyond the range measurement, are explained. This includes the radiometric measurement, bathymetric LiDAR, waveform capturing, new possibilities from UAV platforms, and single photon counting detection. It...
Article
Full-text available
Monitoring of lakeshore ecosystems requires fine-scale information to account for the high biodiversity typically encountered in the land-water ecotone. Sentinel-2 is a satellite with high spatial and spectral resolution and improved revisiting frequency and is expected to have significant potential for habitat mapping and classification of complex...
Article
Full-text available
Habitat quality is the ability of the environment to provide conditions appropriate for individual and species persistence. Measuring or monitoring habitat quality requires complex integration of many properties of the ecosystem, where traditional terrestrial data collection methods have proven extremely time-demanding. Remote sensing has known pot...
Conference Paper
Full-text available
This paper presents certain results of remote sensing of the seas and inland waters, obtained using a portable Laser Induced Fluorescence (LIF) LiDAR in the expeditions of the Shirshov Institute of Oceanology, Russian Academy of Sciences in recent years. The ultraviolet fluorescence lidars (UFL) portable series used in these studies were developed...
Article
Full-text available
Natura 2000 Habitat Conservation Status is currently evaluated based on fieldwork. However, this is proving to be unfeasible over large areas. The use of remote sensing is increasingly encouraged but covering the full range of ecological variables by such datasets and ensuring compatibility with the traditional assessment methodology has not been a...
Article
Full-text available
Since the beginning of the 1960s an escalating deterioration of reed beds in parts of Europe has been often observed. Hence, the ‘reed die-back’ as it was later named, has been a phenomenon of great scientific interest and concern to conservationists worldwide and intensively studied by field ecologists. Imaging spectroscopy has frequently been emp...
Article
Full-text available
There is increasing demand for reliable, high-resolution vegetation maps covering large areas. Airborne laser scanning data is available for large areas with high resolution and supports automatic processing, therefore, it is well suited for habitat mapping. Lowland hay meadows are widespread habitat types in European grasslands, and also have one...
Article
Full-text available
Airborne LIDAR (Light Detection and Ranging) is a remote sensing method commonly used for mapping surface topography in high resolution. A water surface in hydrostatic equilibrium theoretically represents a gravity isosurface. Here we compare LIDAR-based ellipsoidal water surface height measurements all around the shore of a major lake with a local...
Conference Paper
Full-text available
LIDAR point clouds hold valuable information for land cover and vegetation analysis, not only in the spatial distribution of the points but also in their various attributes. However, LIDAR point clouds are rarely used for visual interpretation, since for most users, the point cloud is difficult to interpret compared to passive optical imagery. Mean...
Article
Full-text available
Airborne LIDAR (Light Detection and Ranging) is a remote sensing method commonly used for mapping surface topography in high resolution. A water surface in hydrostatic equilibrium theoretically represents a gravity isosurface. Here we compare LIDAR-based ellipsoidal water surface height measurements all around the shore of a major lake with a local...
Article
Full-text available
Socio-hydrology is the science of human influence on hydrology and the influence of the water cycle on human social systems. This newly emerging discipline inherently in-volves a historic perspective, often focusing on timescales of several centuries. While data on human history is typically available for this time frame, gathering information on t...
Conference Paper
Full-text available
The Habitats Directive requires the EU member states to report on the status of conservation areas every 6 years. This task requires time-and cost-efficient assessment methods. The ChangeHabitats2 project (CH2) investigates the use of full-waveform LiDAR data to support the reporting. CH2 concentrates on parameters that are difficult to represent b...
Conference Paper
The Habitats Directive requires the EU member states to report on the status of conservation areas every 6 years. This task requires time-and cost-efficient assessment methods. The ChangeHabitats2 project (CH2) investigates the use of full-waveform LiDAR data to support the reporting. CH2 concentrates on parameters that are difficult to represent b...
Conference Paper
The Habitats Directive requires the EU member states to report on the status of conservation areas every 6 years. This task requires time-and cost-efficient assessment methods. The ChangeHabitats2 project (CH2) investigates the use of full-waveform LiDAR data to support the reporting. CH2 concentrates on parameters that are difficult to represent b...
Thesis
Full-text available
Reed (Phragmites australis) is the most widespread emergent shore macrophyte in Europe, and has been affected by die-back in many major lakes in the last decades. Lake Balaton is a large and shallow lake sustaining 11 km2of reedwithin its shores and is connected to several tributary rivers which also supported wetlands in historic times.The focus o...
Data
Full-text available
E-Mails: kovacs.attila@okologia.mta.hu (A.W.K.); zlinszky.andras@okologia.mta.hu (A.Z.); presing.matyas@okologia.mta.hu (M.P.); horvath.hajnalka@okologia.mta.hu (H.H.); toth.viktor@okologia.mta.hu (V.R.T.) 2 Centre for Landscape and Climate Research, University of Leicester, Bennett Building, University Road, Leicester LE1 7RH, UK; E-Mails: vnp2@le...
Article
Full-text available
Despite longstanding contributions to oceanography, similar use of fluorescence light detection and ranging (LiDAR) in lake settings is not routine. The potential for ship-mounted, multispectral Ultraviolet Fluorescence LiDAR (UFL) to provide rapid, high-resolution data in variably turbid and productive lake conditions are investigated here through...
Article
Full-text available
Socio-hydrology is the science of human influence on hydrology and the influence of the water cycle on human social systems. This newly emerging discipline inherently involves a historic perspective, often focusing on time scales of several centuries. While data on human history is typically available for this time frame, gathering information on t...
Conference Paper
Full-text available
Airborne Laser Scanning is traditionally used for topography mapping, exploiting its ability to map terrain elevation under vegetation cover. Parallel to this, the application of ALS for vegetation classification and mapping of ecological variables is rapidly emerging. Point clouds surveyed by ALS provide accurate representations of vegetation stru...
Conference Paper
Full-text available
The geoid is the theoretical model of the Earth, defined as an equipotential surface. Typically it corresponds to a mean ocean surface and is extended through the continents. Elevations are measured above “sea level” based on the fact that the surface of water in equilibrium closely follows this equipotential surface. On dry land, the geoid can be...
Article
Full-text available
Outlining patches dominated by different plants in wetland vegetation provides information on species succession, microhabitat patterns, wetland health and ecosystem services. Aerial photogrammetry and hyperspectral imaging are the usual data acquisition methods but the application of airborne laser scanning (ALS) as a standalone tool also holds pr...
Article
Airborne Laser Scanning (ALS) is mainly used for collecting information on geomorphology, but the high spatial resolution and accuracy and especially the sensitivity to vertical structure are also proven to be valuable in vegetation mapping. Point cloud datasets acquired for regional or country-wide ALS surveys have strong potential as an easily ac...
Article
Full-text available
Wetlands are valuable habitats under considerable threat from human activity. Lake shore wetlands are especially suitable for aerial surveys, and aerial photogrammetry, hyperspectral imaging or airborne laser scanning are the usual methods applied. Lake Balaton is a large shallow lake with wetlands in decline since the 1970's. In August 2010, a ful...
Conference Paper
Full-text available
ALS has become a standard tool for high-resolution topographic mapping within the last two decades. Besides the geometric data in form of three-dimensional point clouds, also radiometric information is available in form of amplitude and width of the backscattered echo (the latter is provided by full waveform (FWF) systems only). However, these radi...
Article
The hydrology of Lake Balaton, the largest lake in Central Europe has a long history of human impact, which probably started in prehistoric times through agricultural expansion. The most important change in the water regime of the Lake is considered to be the opening of the Sió Canal in 1863. This resulted in the lowering of the average water level...
Article
Full-text available
Lake Balaton is a large, shallow lake (area: 597 km2, average depth 3.3 m) located in Western Hungary. The valleys joining the lake hold wetlands which are of high conservation value. When the water level of the lake was lowered by more than a meter in 1863, these valleys were also partially drained. In order to investigate the original state of th...
Article
Previous research of the geological evolution of Lake Balaton (Hungary) has been based on sporadic borehole data, evaluation of the topography of the surrounding regions, and water seismic data characterized by low horizontal resolution. The lake bed itself has been surveyed four times at regular intervals since 1895, but the latest complete survey...
Article
Previous research of the geological evolution of Lake Balaton (Hungary) has been based on sporadic borehole data, evaluation of the topography of the surrounding regions, and water seismic data characterized by low horizontal resolution. The lake bed itself has been surveyed four times at regular intervals since 1895, but the latest complete survey...
Article
Full-text available
Satellite remote sensing of water quality parameters is becoming a routine method in oceanological applications around the world. One of the main difficulties of calibrating satellite images to map water quality parameters is the large number and high spatial coverage of ground truth data needed. The UFL-8 fluorescent LIDAR developed by the Shirsho...