Jörn Kohlus

Jörn Kohlus
Landesbetrieb Küstenschutz, Nationalpark und Meeresschutz · Planung und Monitoring

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39
Publications
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254
Citations

Publications

Publications (39)
Article
Full-text available
We developed an extension of a previously proposed classification scheme that is based upon Freeman–Durden and Cloude–Pottier decompositions of polarimetric Synthetic Aperture Radar (SAR) data, along with a Double-Bounce Eigenvalue Relative Difference (DERD) parameter, and a Random Forest (RF) classifier. The extension was done, firstly, by using d...
Article
The change of mapping methods for seagrass beds, here species of eelgrasses, from aerial surveys to automated classification of optical satellite data is described. Both methods are compared with respect to availability and suitability of their data. Differences in the detection capability of the methods are shown as well as results of the validati...
Article
Neobiotic species can have profound impacts on food webs and entire ecosystems. The American razor clam Ensis leei was introduced into the Wadden Sea by vessels in the late 1970s and has since spread widely. It has been suggested that Ensis does not interact strongly with other benthic species. The abundance and biomass of E. leei were recorded in...
Article
Full-text available
(EN)An article about the use of the stucco in Eiderstedt in the Historism at the turn of the century in the end of the 19th century. The occurrence of buildings with decorative facades in the town of Tönning is depicted and the forms used are characterized. The article deals with the renovation of a building and describes the decision-making proce...
Article
Full-text available
We show that high-resolution space-borne Synthetic Aperture Radar (SAR) imagery with pixel sizes well below 1 m² can be used to complement archaeological surveys in areas that are difficult to access. After major storm surges in the 14th and 17th centuries, vast areas on the German North Sea coast were lost to the sea. Areas of former settlements a...
Article
Full-text available
We show that high-resolution space-borne synthetic aperture radar (SAR) imagery with pixel sizes smaller than 1 m 2 can be used to complement archaeological surveys on intertidal flats. After major storm surges in the 14th and 17th centuries ("Grote Mandrenke"), vast areas on the German North Sea coast were lost to the sea. Areas of settlements and...
Article
Informationen verknüpfen, Synergien nutzen, Wissen generieren – die Marine Daten-Infrastruktur Deutschland integriert die wesentlichen Datenquellen über alle Fach-, Behörden- und Institutsgrenzen. Mit Hilfe eines Internet-Portals werden die bislang über Bund und Länder verteilten marinen Fachdaten umfassend zur Nutzung bereitgestellt
Conference Paper
Full-text available
We show that high-resolution space-borne Synthetic Aperture Radar (SAR) imagery with pixel sizes well below 1 m² can be used to complement archaeological surveys in areas that are difficult to access. After major storm surges in the 14 th and 17 th centuries, vast areas on the German North Sea coast were lost to the sea. Areas of former settlements...
Article
Full-text available
The Wadden Sea along the North Sea coasts of Denmark, Germany, and the Netherlands is the largest unbroken system of intertidal sand and mud flats in the world. Its habitats are highly productive and harbour high standing stocks and densities of benthic species, well adapted to the demanding environmental conditions. Therefore, the Wadden Sea is on...
Conference Paper
Full-text available
After major storm surges in the 14 th and 17 th centuries, vast areas on the German North Sea coast were lost to the sea. What was left of former settlements and historical land use was buried under sediments for centuries, but when the surface layer is driven away under the permanent action of wind, currents, and waves, they appear again at the Wa...
Conference Paper
Full-text available
After major storm surges in the 14 th and 17 th centuries, vast areas on the German North Sea coast were lost to the sea. What was left of former settlements and historical land use was buried under sediments for centuries, but when the surface layer is driven away under the permanent action of wind, currents, and waves, they appear again at the Wa...
Conference Paper
Full-text available
After major storm surges in the 14 th and 17 th centuries, vast areas on the German North Sea coast were lost to the sea. However, remnants of former settlements and of historical landuse, which were buried by sediments for several centuries, can still be found in the German Wadden Sea, if the surface layer is driven away under the permanent action...
Article
Full-text available
Standardized information infrastructures for the North Sea and Baltic Sea coast have been established by BMBF funding of two projects NOKIS and NOKIS++ in the years 2001to 2008 as contribution to an integrated coastal zone management. Motivation and objectives for an information system supporting integrated coastal engineering and integrated protec...
Article
Full-text available
A gazetteer Web service is an essential semantic component in a Spatial Data Infrastructure (SDI). Due to the different query options - starting from the text, searching for its spatial representation or vice versa asking for the designation of an area - the gazetteer can be used both, for issues with semantic context as well for onomasiological qu...
Conference Paper
Distributed geospatial data and services can be used to form Spatial Data Infrastructures (SDI). Current technological developments enable SDI to process large amounts of geospatial data. In this context, Web Processing Services (WPS) can be used as an open interface standard for accessing and executing geospatial processes. Since many SDI are base...
Article
Full-text available
The North and Baltic Sea Information System (NOKIS) has the goal to estab- lish an information infrastructure for the German coast, driven by metadata. The system is based on a metadata driven framework and provides a set of tools for handling and using coastal data. One of the tools to fi nd datasets is a gazetteer to search for information by top...
Conference Paper
Full-text available
We demonstrate that Synthetic Aperture Radar (SAR) data have great potential to improve an existing monitoring system for intertidal flats and to complement the classification of sediments, macrophytes, and mussels in the German Wadden Sea. Multi-satellite SAR data acquired at different radar bands (L, C, and X band, from ALOS PALSAR, from ERS SAR,...
Conference Paper
Full-text available
Synthetic Aperture Radar (SAR) data have been included into an existing monitoring system to complement the classification of sediments, macrophytes, and mussels in the German Wadden Sea. Whereas the use of satellite-borne optical sensors in northern latitudes is strongly limited by clouds and haze, SAR data allow earth observation that is independ...
Conference Paper
Full-text available
High-resolution multispectral remote sensing data from satellite-borne optical sensors have been used for the classification of sediments, macrophytes, and mussels on exposed intertidal flats in the German Wadden Sea. Since the use of those sensors in northern latitudes is strongly limited by clouds and haze, we included synthetic aperture radar (S...
Conference Paper
Full-text available
More than 375 years ago, a big storm surge in the German Bight of the North Sea destroyed farmland, farms, and villages, and killed a great number of both cattle and men. The big (second) “Mandränke” of 1634 is still one of the most famous storm surges in the area of the North Frisian Wadden Sea. We present first results of our analyses of spacebor...
Article
Conclusions - Most of the seagrass in the Wadden Sea occurs in the northern part. Beds are mainly positioned on the leeside of islands or in the shelter of high sand bars. Few, and generally smaller, beds are found in the Central and Southern Wadden Sea. A larger stock is present in the Jadebusen, mainly consisting of Z. noltii. The large Z. marina...
Article
Full-text available
Aerial surveys on seagrass (Zostera spp.) indicate a three to fourfold increase in bed area from 1994 to 2006 with up to 100km2 or 11% of intertidal flats in the Northfrisian Wadden Sea (coastal eastern North Sea), observed at seasonal maximum in August when flying during low tide exposure 300 to 500m above ground. When viewed from the air, difficu...
Conference Paper
Full-text available
Web based tools facilitate intersectoral views of resources by providing for technological solutions of networking and distributed data management in a service oriented architecture, which relies on the ISO standards 19115 for metadata and 19117 for web services. Key features of the described information infrastructure are a metadata authoring tool...
Article
Full-text available
Web based tools facilitate intersectoral views of resources by providing for technological solutions of networking and distributed data management in a service oriented architecture, which relies on the ISO standards 19115 for metadata and 19117 for web services. Key features of the described infor- mation infrastructure are a metadata authoring to...
Article
General The initial motivation for the project NOKIS (German title: Nord- und Ostsee-Küsteninformationssystem) was the absence of an infrastructure for the exchange of geodata across administrative boundaries between the German wadden sea national parks and other governmental administrations (e.g. from water manage- ment and administration of water...
Article
Full-text available
Data structures and services related to a gazetteer have been established during implementation of the information system NOKIS. The investigation area of the gazetteer is the water zone of Germany's sovereign territory, extending 50 km into the hinterland. For the word-pool heterogeneous material is collected. Its used for critical examination of...
Article
NOKIS - North and Baltic Sea Information System - is a project, a concept and a solution. It is a project of a team of scientists and engineers from seven coastal authorities which aimed to give access to theirs metadata. The project starts in 2000 and gets funding as a GCERC (KFKI) project by the Ministry of Education and Research. NOKIS is a cent...

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Projects (2)
Archived project
Project
Marine Daten Infrastruktur Deutschland