Cornelis Stal

Cornelis Stal
Hogeschool Gent | HoGent · Department of Real Estate

Ph.D.

About

98
Publications
57,528
Reads
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829
Citations
Citations since 2016
27 Research Items
601 Citations
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2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Introduction
Cornelis Stal (°1985, Waalre, the Netherlands) is a PostDoc researcher working on the combination of airborne and terrestrial laser scanning for 3D city modeling. His special interest is in the (automatic) generation of geometric, radiometric and semantic rich 3D models, derived from irregular point sets and other spatial datasets. This means that both laser scanning as a discipline in land survey and geo-IT (GI-systems, GI-programming, GI-management,...) are important pillars of his research.
Additional affiliations
September 2018 - present
Ghent University
Position
  • Professor
November 2014 - present
Hogeschool Gent
Position
  • Lecturer
May 2014 - September 2018
Ghent University
Position
  • PostDoc Position
Education
September 2007 - September 2009
Ghent University
Field of study
  • Geomatics and Surveying
September 2004 - September 2007
Ghent University
Field of study
  • Geography and Geomatics: Land Surveying

Publications

Publications (98)
Article
Full-text available
Spatial data play a crucial role in archaeological research, and orthophotos, digital elevation models, and 3D models are frequently used for the mapping, documentation, and monitoring of archaeological sites. Thanks to the availability of compact and low-cost uncrewed airborne vehicles, the use of UAV-based photogrammetry matured in this field ove...
Article
Full-text available
Through time, both natural and cultural heritage have unfortunately been under threat due to multiple environmental and human-induced factors, which are likely to trigger various hazards such as soil erosion, landslides, or land collapse. The analysis of old cartographic material, aerial imagery, and satellite imagery has been used in multiple stud...
Article
Full-text available
The digital age has brought about an explosion in the growth of data, of which data with a geographical component stands out. Proper use of geographical data comes with the need for correct coordinate reference systems (CRSs). They are considered the ultimate binder for interoperability between geospatial data actors and stakeholders. Moreover, CRS...
Conference Paper
Full-text available
Investigations of the water in an archaeological context could be connected to natural water supply, hydrological conditions, and socio-cultural developments of human societies in the past is a real challenge for contemporary research. Unfortunately, the past human habitation was perceived as a terrestrial model for many years. Consequently, the ar...
Article
Full-text available
Beach Surface Moisture (BSM) is a key attribute in the coastal investigations of land-atmospheric water and energy fluxes, groundwater resource budgets and coastal beach/dune development. In this study, an attempt has been made for the first time to estimate BSM from terrestrial LiDAR intensity data based on the Support Vector Regression (SVR). A l...
Article
The measurement of surface moisture on beaches is vital for studying aeolian sand transport mechanisms, but existing techniques are not adequate for monitoring the surface moisture dynamics over a substantial beach section. In this study, we investigated the suitability of a new remote sensing method to monitor the spatiotemporal variation in surfa...
Article
Full-text available
The development of unmanned aerial vehicles (UAV) and close-range photogrammetry facilitates the fast and accurate micro-topographical mapping and analysis of archaeological sites. Considering these aspects, archaeologists increasingly implement the use of UAVs for mapping known archaeological sites and of course for discovering new areas of intere...
Article
Full-text available
Sustainable forest management heavily relies on the accurate estimation of tree parameters. Among others, the diameter at breast height (DBH) is important for extracting the volume and mass of an individual tree. For systematically estimating the volume of entire plots, airborne laser scanning (ALS) data are used. The estimation model is frequently...
Conference Paper
Full-text available
Two commonly used programming languages in geosciences are R and Python. Both languages come with inherent advantages and disadvantages. While Python is a general-purpose language with a readable syntax, R is built by statisticians and encompasses their specific language. In contrast with more nominative and static programming languages, like C++ o...
Article
Talus slopes are common places for debris storage in high‐mountain environments and form an important step in the alpine sediment cascade. To understand slope instabilities and sediment transfers, detailed investigations of talus slope geomorphology are needed. Therefore, this study presents a detailed analysis of a talus slope on Col du Sanetsch (...
Article
Full-text available
Surface moisture plays a key role in limiting the aeolian transport on sandy beaches. However, the existing measurement techniques cannot adequately characterize the spatial and temporal distribution of the beach surface moisture. In this study, a mobile terrestrial LiDAR (MTL) is demonstrated as a promising method to detect the beach surface moist...
Article
Intertidal polychaete aggregations may be protected in the European Union under the Habitats Directive framework as reef habitats. Remote reef mapping remains challenging due to severe and dynamic conditions, as well as cover and spatial resolution requirements. This study (1) evaluated kite aerial photography and low-altitude digital photogrammetr...
Article
Full-text available
Data and metadata products based on intensive terrestrial gravity measurements covering the Belgian territory have been established compliant to the new ISO19115‐1 profile for gravity‐related data. A short historical introduction on gravity measurements on the Belgian territory is presented, starting with the first gravity measurement in 1892. This...
Conference Paper
Digital elevation models play a crucial role in the analysis of complex spatial challenges. Given the international dimension of many environmental applications, elevation data have been integrated in the European INSPIRE directive (Annex II, Elevation theme). As a result, many types of data are offered in various formats by mapping agencies and go...
Conference Paper
Full-text available
In order to protect the Belgian coast, knowledge on natural sand dynamics is essential. Monitoring sand dynamics is commonly done through sediment budget analysis, which relies on determining the volumes of sediment added or removed from the coastal system. These volumetrics require precise and accurate 3D data of the terrain on different time stam...
Conference Paper
Full-text available
To date, the most common way to visualize lithics in publications is by manually making scaled drawings. However, the construction of these drawings is labor-intensive. Furthermore, the results frequently do not meet the user's requirements in terms of their level of detail and accuracy. In addition, all drawings involve some degree of interpretati...
Conference Paper
Full-text available
In the summer of 2015 and 2016, a team of surveying engineers from Ghent University College (Department of Real Estate and Landsurveying) and Ghent University (Department of Geography) joined an interdisciplinary team of archaeologists and paleoecologists in the Copan Valley, Honduras. The campaigns were organized within the framework of the PARAC...
Article
With the recent technological advances offered by SfM-photogrammetry, we now have the possibility to study gully erosion at very high spatial and temporal scales from multi-temporal DEMs; and thus to enhance our understanding of both gully erosion processes and controls. Here, we exanimate erosion gully degradation and aggradation at the gully head...
Conference Paper
Full-text available
Without adaptation, 0.2 to 4.6% of the global population may be flooded annually in 2100 with scenarios of 0.25 till 1.23 m global mean sea level rise. Therefore, it is necessary that local governments engage and educate the local community in order to adapt to the impacts of sea level rise. To this point, we developed a comprehensive four-dimensio...
Article
In this paper, the use of a tidal buoy, equipped with a GNSS, is assessed. The prediction of the tide in the North Sea area is performed by a network of coastal tidal gauges. Long term measurements by these gauges are used to derive tidal constituents and the construction of tidal prediction tables for each separate measurement location. To estimat...
Article
Monitoring of measurements needs to be supported by a thorough knowledge of the achievable accuracy of the measurement equipment and the processing methodology. This study on ovalization monitoring with laser scanning in tunnels under construction focused on fast-performing laser scanners and their achievable accuracy. This research also investigat...
Article
The aerial photographs (APs) acquired by the Istituto Geografico Militare (IGM) in the period of the Italian occupation of Ethiopia (1935-1941) have recently been discovered, scanned and organised. Until recently, the oldest APs of the country that were available had been taken in the period 1958-1964. The APs over Ethiopia in 1935-1941 consist of...
Article
Full-text available
Transforming relations between stratigraphic units of an archaeological excavation to a formal model like the Harris Matrix is a challenging task. Especially when the number of stratigraphic units is large or when spatiotemporal relations are complex, such models are difficult to generate. This paper describes a novel procedure for the automated co...
Poster
Full-text available
Aerial imagery has long been used as a method for monitoring the status of natural resources. However, its use in the field of marine biology remains restricted as it is difficult to detect and map specific biotopes with enough spatial resolution in the coastal zone. This is especially the case for biogenic reefs with patchy distributions of rather...
Presentation
Full-text available
Aerial imagery has long been used as a method for monitoring the status of natural resources. However, its use in the field of marine biology remains restricted as it is difficult to detect and map specific biotopes with enough spatial resolution in the coastal zone. This is especially the case for biogenic reefs with patchy distributions of rather...
Article
Full-text available
Obtaining information about the spatial distribution of desert plants is considered as a serious challenge for ecologists and environmental modeling due to the required intensive field work and infrastructures in harsh and remote arid environments. A new method was applied for assessing the spatial distribution of the halophytic species (HS) in an...
Article
The ability to understand gully erosion development is closely related to our ability to quantify the morphology of gullies. At present, various technologies are at hand to collect data at increasing levels of detail. However, many of the developed technologies are time-consuming, difficult to apply or expensive. As an alternative, image-based mode...
Conference Paper
Full-text available
Since its introduction in 2005, Google Earth has been downloaded over 1 billion times. It is by far the most popular virtual globe and has gained academic interest as well, mainly due to the incorporation of KML (Keyhole Markup Language). KML is an XML-based open source language that has been adopted as an OGC standard since 2008 and allows users t...
Conference Paper
Most current digital 3D city modelling procedures have either a low degree of automation or require specialized skills. Moreover, the construction process is the result of an equilibrium between the desired level of detail on the one hand and modelling performance on the other hand. Although environmental 3D models and 3D city models in particular...
Conference Paper
Full-text available
Currently, the use of unmanned aerial vehicles (UAV) as a platform for aerial photography is becoming more and more common practice in 3D photo modelling applications. Examples of this trend can be found in various fields of research, ranging from archaeology over civil engineering to crowd management. However, the use of these platforms has severa...
Article
In 2012, for the first time in Belgium, integrated monitoring was carried out to assess the deformations of a twin-tube tunnel below the River Scheldt in Antwerp under the influence of estuarine tides. Levelling measurements during a tide cycle showed a variation in the height of levelling bolts of up to 10 mm between low and high tide. Simultaneou...
Article
Approximately 34,000 aerial photographs covering large parts of Ethiopia and dating back to 1935–1941 have been recently recovered. These allow investigating environmental dynamics for a past period that until now is only accessible from terrestrial photographs or narratives. As the archive consists of both oblique and vertical aerial photographs t...
Conference Paper
Full-text available
The destructive nature of archaeological excavations and the spatial character of archaeological finds make 3D models valuable contributions to the documentation of archaeological information. Laser scanning allows highly accurate 3D reconstructions, but involves considerable costs and expert knowledge. Therefore, photo modelling could be considere...
Article
The ovalization monitoring methodology based on laser scanning, developed during two recent tunneling projects in Belgium, elaborates a clear processing workflow and easily interpretable deliverables with sub-millimeter accuracy. The extensive and systematic monitoring coverage during the first three months after construction of a circular tunnel s...
Conference Paper
Mobile mapping with laser scanning is frequently limited to the sole geometric reconstruction of objects or surfaces. In the special case of the construction of Digital Elevation Models (DEMs) of intertidal zone of beaches, this task is known to be very challenging. In the context of the interdisciplinary research project named 'SeArch', which aims...
Conference Paper
Full-text available
By now, the use of terrestrial laser scanning for deformation measurements of large concrete structures is well established. To tackle the time consuming processing of the large amounts of data that are the result of the scanning process, a 'Quick and Dirty Method' (QDM) was developed and documented. In order to quickly derive a certain number of c...
Article
Archaeological excavation is a destructive process, making accurate, fast and efficient 3D documentation of information essential. With this in mind, our research uses an integrated workflow of topographic measurements and image-based 3D modelling to generate highly accurate reconstructions of archaeological features at the site of Thorikos, Greece...
Conference Paper
Full-text available
For the first time in Belgium, an integrated monitoring campaign based on laser scanning, levelling and strain gauge measurements was carried out to assess the deformations of a recently built twin tube tunnel, giving deeper insights in the deformation pattern under influence of river tides. A selected section in one of the tunnel tubes of the ‘Lie...
Article
Full-text available
This article presents a newly developed procedure for the classification of airborne laser scanning (ALS) point clouds, based on binomial logistic regression analysis. By using a feature space containing a large number of adaptable geometrical parameters, this new procedure can be applied to point clouds covering different types of topography and v...
Article
The aim of the current study is to examine the role played by Thorikos within the Laurion silver mining area from the perspective of metallurgical activities during the Classical and Early Hellenistic periods. Because water availability directly determines the production output of metallurgical workshops, a hydrological analysis of the area is an i...
Article
Full-text available
Mobile mapping with laser scanning is frequently limited to the sole geometric reconstruction of objects or surfaces. In the special case of the construction of Digital Elevation Models (DEMs) of intertidal zone of beaches, this task is known to be very challenging. In the context of the interdisciplinary research project named ‘SeArch’, which aims...
Article
Full-text available
A 4-year curriculum degree of “Licence in Geography option Land Surveying”was introduced in 1990 at two Belgian academic universities: both at the “Université de Liège” in the French speaking part of Belgium and at “Ghent University” in the Dutch speaking part of Belgium. With the BAMA revolution in 2004, this degree has been converted into a 5-yea...
Article
Laser scanning is more and more being applied in different fields of applications, including civil engineering. However, when considering pulse-based and phase-based laser scanners, there are important differences that have an influence on the choice of the most suited type of laser scanner, depending on the project’s specifications and the accurac...
Conference Paper
Full-text available
The Walloon Region in Belgium played a leading role in the world economy and in the industrial sciences and engineering since the 19th century. Several relicts, such as important industrial buildings or sites, are spread over a large area and are still dominating the current landscape. Some of these remnants are preserved as monuments, representing...
Conference Paper
In 2012, a 1-year, English spoken, curriculum degree of "Postgraduate in Hydrography” was started in Belgium as a cooperation between the Geography/Geomatics Department of Ghent University and the Institute for Hydrography of the Antwerp Maritime Academy, which is the hosting institute. Recent survey studies about hydrographic education in the Ne...
Conference Paper
Full-text available
Terrestrial photogrammetry and terrestrial laser scanning are important tools for the documentation of cultural heritage. The combination of both tools enables the generation of highly accurate geometric and radiometric 3D models. This data combination can be performed directly, using integrated sensors, or in post processing, using image draping s...
Conference Paper
Full-text available
In Belgium, it took until the 1990’s before academic degrees in land surveying and later geomatics were organized. In 1990, the introduction of two types of academic degrees crowned a series of efforts to - on the one hand - improve the regulation of the profession of geodetic surveyors and - on the other hand - enhance the education in this field....
Conference Paper
Full-text available
For some time past, terrestrial laser scanning has been adopted as one of the data acquisition techniques for e.g. deformation measurements, documentation of historical monuments and civil engineering projects. Using terrestrial laser scanning, millions of 3D points can be obtained with a high accuracy in a time span of minutes or even seconds depe...
Conference Paper
Full-text available
In 1990, a 4-year curriculum degree of "Licence in Geography option Land Surveying" was introduced at two Belgian academic universities: both at the "Université de Liège" in the French speaking part of Belgium and at the "Universiteit Gent" ("Ghent University") in the Dutch speaking part of Belgium. With the BAMA evolution in 2004, this degree has...
Conference Paper
Full-text available
In this paper, a short discussion is presented on some important considerations of spatial data fusion. The discussion is motivated by the frequent lack of prescient project preparation and the possible additional costs and delays that are caused by this absence. Especially when multi-source modelling is involved in a spatial context, the definitio...
Conference Paper
Full-text available
One of the biggest threats to cultural heritage is related to their rapidly changing and developing surroundings. The Giza pyramid plateau is a prime example of this phenomenon, as it is threatened by the enormous urban expansion of Cairo over the last decades. Documenting, monitoring and modelling such a pressure requires accurate and detailed geo...
Article
Full-text available
A digital surface model DSM extracted from stereoscopic aerial images, acquired in March 2000, is compared with a DSM derived from airborne light detection and ranging lidar data collected in July 2009. Three densely built-up study areas in the city centre of Ghent, Belgium, are selected, each covering approximately 0.4 km2. The surface models, gen...
Conference Paper
Full-text available
This poster presentation offers results of a joint survey project in the northwest of Malta with finds ranging from the Prehistoric till the Early Modern period. The project is a trilateral endeavour of the Department of Archaeology of Ghent University (Belgium), the University of Malta and the Superintendence of Cultural Heritage (Malta) since 200...
Conference Paper
Full-text available
In the framework of the European Union Erasmus Intensive Program which aims at sponsoring intentive courses jointly proposed by european universities, ENSTA Bretagne (France), Ghent University (Belgium) and HCU University (Germany), and the CIDCO (Interdisciplinary Centre for the Development of Ocean Mapping) (Canada), as an associate partner, orga...
Conference Paper
Full-text available
Multibeam echosounder measurements serve to make a digital terrain model of the sea floor. The Delaunay triangulation is a widely appreciated and investigated mathematical model to represent the sea floor topography and is highly efficient for building triangular irregular networks (TINs) out of non-homogeneous data such as raw multibeam data. Obta...