Zsófia Koma

Zsófia Koma
Norwegian Institute of Bioeconomy Research | NIBIO

PhD

About

55
Publications
9,749
Reads
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311
Citations
Citations since 2017
23 Research Items
298 Citations
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080
Additional affiliations
September 2021 - April 2023
Aarhus University
Position
  • PostDoc Position
November 2018 - September 2021
University of Amsterdam
Position
  • Instructor
November 2017 - present
University of Amsterdam
Position
  • Instructor
Education
June 2017 - June 2021
October 2016 - January 2017
Universität Heidelberg
Field of study
  • Internship
July 2016 - August 2016
Hungarian Academy of Sciences
Field of study
  • Internship

Publications

Publications (55)
Article
Quantifying ecosystem structure is of key importance for ecology, conservation, restoration, and biodiversity monitoring because the diversity, geographic distribution and abundance of animals, plants and other organisms is tightly linked to the physical structure of vegetation and associated microclimates. Light Detection And Ranging (LiDAR) — an...
Article
Full-text available
The third Dutch national airborne laser scanning flight campaign (AHN3, Actueel Hoogtebestand Nederland) conducted between 2014 and 2019 during the leaf-off season (October–April) across the whole Netherlands provides a free and open-access, country-wide dataset with ∼700 billion points and a point density of ∼10(–20) points/m². The AHN3 point clou...
Article
Full-text available
Aim The increasing availability of remote sensing (RS) products from airborne laser scanning (ALS) surveys, synthetic aperture radar acquisitions and multispectral satellite imagery provides unprecedented opportunities for describing the physical structure and seasonal changes of vegetation. However, the added value of these RS products for predict...
Article
Full-text available
Aim Light Detection And Ranging (LiDAR) is a promising remote sensing technique for ecological applications because it can quantify vegetation structure at high resolution over broad spatial extents. Using country‐wide airborne laser scanning (ALS) data, we test to what extent fine‐scale LiDAR metrics capturing low vegetation, medium‐to‐high vegeta...
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
Numerous organisms depend on the physical structure of their habitats, but incorporating such information into ecological niche analyses has been limited by the lack of adequate data over broad spatial extents. The increasing availability of high‐resolution measurements from country‐wide airborne laser scanning (ALS) surveys – a light detection and...
Article
Full-text available
Point cloud datasets provided by LiDAR have become an integral part in many research fields including archaeology, forestry, and ecology. Facilitated by technological advances, the volume of these datasets has steadily increased, with modern airborne laser scanning surveys now providing high-resolution, (super-)national scale, multi-terabyte point...
Article
Full-text available
Mapping 3D vegetation structure in wetlands is important for conservation and monitoring. Openly accessible country‐wide Airborne Laser Scanning (ALS) data—using light detection and ranging (lidar) technology—are increasingly becoming available and allow us to quantify 3D vegetation structures at fine resolution and across broad spatial extents. He...
Article
Full-text available
Aim Vegetation structure is a key determinant of animal diversity and species distributions. The introduction of Light Detection and Ranging (LiDAR) has enabled the collection of massive amounts of point cloud data for quantifying habitat structure at fine resolution. Here, we review the current use of LiDAR‐derived vegetation metrics in diversity...
Article
Full-text available
Modernization of agricultural land use across Europe is responsible for a substantial decline of linear vegetation elements such as tree lines, hedgerows, riparian vegetation, and green lanes. These linear objects have an important function for biodiversity, e.g., as ecological corridors and local habitats for many animal and plant species. Knowled...
Conference Paper
Full-text available
Reedbeds are important wetland habitats that suffer from severe decline in recent decades. High precision automatic mapping and monitoring of reedbeds is therefore an important remote sensing application. Here, we developed an object-based approach for differentiating wetland habitat types (reedbeds, shrubs, open water, trees) using countrywide Air...
Article
Recent improvements in topographic LiDAR technology allow the detailed characterization of individual trees at both branch and leaf scale, providing more accurate information to support phenological and ecological research. However, an effective methodology to map single leaves in 3-D is still missing. This letter presents a point cloud segmentatio...
Conference Paper
Full-text available
In the last decades, the established Airborne Laser Scanning (ALS) approach for urban tree species classification has been increasingly complemented by laser scanning datasets measured from further platforms such as Terrestrial Laser Scanning (TLS), Mobile Laser Scanning (MLS), and UAV-borne Laser Scanning (ULS). However, the characteristics of the...
Article
Full-text available
Information about the 3D structure of understory vegetation is of high relevance in forestry research and management (e.g., for complete biomass estimations). However, it has been hardly investigated systematically with state-of-the-art methods such as static terrestrial laser scanning (TLS) or laser scanning from unmanned aerial vehicle platforms...
Conference Paper
Full-text available
Light Detection and Ranging (LiDAR) especially the ground based LiDAR (Terrestrial Laser Scanning-TLS) is an operational used and widely available measurement tool supporting forest inventory updating and research in forest ecology. High resolution point clouds from TLS already represent single leaves which can be used for a more precise estimation...
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
Since the early 2000s, the DTMs have been increasingly used for morphometric studies, especially in volcanolog-ical research. The most common volcanic edifices for GIS analysis are the monogenetic scoria cones, because they are relatively symmetrical forms. With high-resolution LiDAR data we studied cone parameters, such as aspect, area, cone and c...
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...
Conference Paper
Full-text available
Geomorphometric and traditional GIS methods are widely used for studying volcanic forms, e.g. cinder (scoria) cones, which have usually symmetric shapes, but they can be asymmetrical, as well. Their asymmetry may stem of volcanogenic processes or result of erosional processes. Studying asymmetry one can imply to the denudation, denudation rate, and...
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...
Poster
Full-text available
Currently the application of high density LiDAR data in forestry mostly concentrates on biomass calculation or classification of the forest into single tree species. However, in ecological point of view the LiDAR data can be a suitable dataset to analyse the forest at community level. In this study we investigated how to extract ecological informat...
Article
Full-text available
Doline morphometry has always been in the focus of karst geomorphological research. Recently, digital terrain model (DTM) based methods became widespread in the study of dolines. Today, LiDAR datasets provide high resolution DTMs, and automated doline recognition algorithms have been developed. In this paper, we test different datasets and a doline...
Article
Full-text available
Vegetation mapping in urban environments plays an important role in biological research and urban management. Airborne laser scanning provides detailed 3D geodata, which allows to classify single trees into different taxa. Until now, research dealing with tree classification focused on forest environments. This study investigates the object-based c...
Article
Full-text available
Vegetation mapping in urban environments plays an important role in biological research and urban management. Airborne laser scanning provides detailed 3D geodata, which allows to classify single trees into different taxa. Until now, research dealing with tree classification focused on forest environments. This study investigates the object-based c...
Conference Paper
Full-text available
Today one of the biggest challenges in forestry application of ALS LiDAR data is to classify different tree species. Selecting training areas or finding the optimal algorithm is important, but determining the optimal number of classes (which species are possible to separate) is also important but only a few papers aim to solve this issue. The CCDA...
Conference Paper
Full-text available
Mobile Laser Scanning (MLS) is an evolving operational measurement technique for urban environment providing large amounts of high resolution information about trees, street features, pole-like objects on the street sides or near to motorways. In this study we investigate a robust segmentation method to extract the individual trees automatically in...
Conference Paper
Full-text available
Airborne Laser Scanning (ALS) is a widely used technology for forestry classification applications. However, single tree detection and species classification from low density ALS point cloud is limited in a dense forest region. In this study we investigate the division of a forest into homogenous groups at stand level. The study area is located in...
Conference Paper
Full-text available
Scoria cones are often studied using geomorphometric and traditional GIS methods, e.g. aspect, slope his-tograms, area, cone height/width ratio. In order to enhance the non-symmetric shape components in contrast to the conical forms, we used a new approach in our research: the polar coordinate transformation (PCT) introduced by Székely & Karátson (...
Poster
Full-text available
Geomorphometric analysis of the scoria cones of the San Francisco Volcanic Field using polar coordinate transformation
Conference Paper
Full-text available
Hungary is situated in the crossroad of several large-scale infrastructural pathways like transnational pipelines and transcontinental motorways. At the same time the country is rich in known and potential archaeological sites. Archaeological prediction techniques aided by remote sensing are intended to help increase preparedness for archaeological...
Conference Paper
Full-text available
Centrally symmetric landform elements are very common features on the surface of the planet Mars. The most conspicuous ones of them are the impact craters of various size. However, a closer look on these features reveals that they show often asymmetric patterns as well. These are partially related to the geometry of the trajectory of the impacting...
Conference Paper
Full-text available
The central area of the Pannonian basin encompasses mostly low-relief areas. Its south-western part, the southern Transdanubian hilly areas have characteristic NNW-SSE directional pattern. One of the largest valleys is a conspicuously straight valley section of the River Sárvíz between Székesfehérvár and Szekszárd. The river collects the waters of...
Conference Paper
Full-text available
The Western Pannonian Alpine Foothills, the transition zone of the Eastern Alpine Foreland and the Pannonian Basin, is an area of differential uplift: it is bordered by the exhuming Rechnitz window in NW and the subsiding Little Hungarian Plain in the E. The eastern part of the area exhibits a great number of very flat, slightly tilted surface sub...
Article
Quasi-planar morphological surfaces may become dissected or degraded with time, but still retain original features related to their geologic-geomorphic origin. To decipher the information hidden in the relief, recognition of such features is required, possibly in an automated manner. In our study, using Shuttle Radar Topography Mission (SRTM) digit...
Conference Paper
Full-text available
The Transdanubian Region is a typically hilly, geologically manifold area of the Pannonian Basin. It is composed primarily of Permo-Mesozoic carbonates and siliciclastic sediments, however Pannonian sedimentary units and young volcanic forms are also characteristic, such as those in the Bakony-Balaton Highland Volcanic Field. The geological diversi...
Conference Paper
Full-text available
Aerial imagery derivatives collected by the Unmanned Aerial Vehicle (UAV) technology can be used as input for generation of high resolution digital terrain model (DTM) data along with the Terrestrial Laser Scanning (TLS) method. Both types of datasets are suitable for detailed geological and geomorphometric analysis, because the data provide micro-...
Conference Paper
Full-text available
The mentioned natural laboratory is an active landslide in Doren (Vorarlberg, Western Austria). This landslide, located in the foreland Molasse zone, was already sketched in historical maps from the 19th century. In recent years, there have been two major events in 2006 and 2007, resp., and ongoing movement since then. These events triggered the de...
Conference Paper
Full-text available
Due to the need for quantitative analysis of various geomorphological landforms, the importance of fast and effective automatic processing of the different kind of digital terrain models (DTMs) is increasing. The robust plane fitting (segmentation) method, developed at the Institute of Photogrammetry and Remote Sensing at Vienna University of Techn...
Conference Paper
Full-text available
Geological data is usually processed with the help of 2D maps and profiles. However, through the development of computational capabilities, the generation and analysis of 3D geologic models became widespread. They give us new opportunities for displaying and interpreting three dimensional geological data without having to use the above mentioned pr...
Conference Paper
Full-text available
As increasingly larger coverage of DTMs is available for the Martian surface, not only the number of studies on individual specific Martian features increase, but the need for large-scale geomorphometric evaluation is amplified as well. The computer power and the increasingly sophisticated methods are about to allow such extensive studies. Our DTM...
Conference Paper
Full-text available
The Western slope of the Central Andes between 22° and 17°S is characterized by large, quasi-planar landforms with tilted ignimbrite surfaces and overlying younger sedimentary deposits (e.g. Nazca, Oxaya, Huaylillas ignimbrites). These surfaces were only modified by tectonic uplift and tilting of the Western Cordillera preserving minor now fossiliz...
Conference Paper
Full-text available
Structural geomorphometric analysis of high-resolution laser scanned DTMs is a straightforward method to study microtopographic components of dynamically forming landscapes, and thus areas affected by mass movements. However, results for multitemporal DTMs may turn out to be difficult to evaluate. In our approach, a robust plane fitting algorithm i...
Conference Paper
Full-text available
In recent years, laser scanning, also referred to as LiDAR, has proved to be an important tool for topographic data acquisition. Basically, laser scanning acquires a more or less homogeneously distributed point cloud. These points represent all natural objects like terrain and vegetation as well as man-made objects such as buildings, streets, power...
Conference Paper
Full-text available
A great number of methods exist to analyse digital terrain models (DTMs) of volcanic edifices. However, most of these methods are not fully automated, or they need special treatment of the DTM to become suitable for this purpose. In our study a robust plane fitting method is used to model the surface of the volcanic cone, including all possible lan...

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