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  • Authors: Hagen, Robert; Plüß, Andreas; Freund, Janina; Ihde, Romina; +5 Authors

    Das Themengebiet Hydrodynamik von EasyGSH-DB (Erstellung anwendungsorientierter synoptischer Referenzdaten zur Geomorphologie, Sedimentologie und Hydrodynamik in der Deutschen Bucht), ist ein Teil der referenzierbaren, kontinuierlich aufbereiteten Basisdatensatz für die Deutsche Bucht. Unter diesem Metadatensatz werden alle Produkte der Hydrodynamik gelistet und verwiesen. Produkt: - EasyGSH-DB: Tidekennwerte des Wasserstandes (TDKW) - EasyGSH-DB: Tidekennwerte der Strömungsgeschwindigkeit (TDKV) - EasyGSH-DB: Tidekennwerte des Salzgehaltes (TDKS) - EasyGSH-DB: Tidekennwerte der Bodenschubspannung (TDKB) - EasyGSH-DB: Langzeitkennwerte des Wasserstands (LZKW) - EasyGSH-DB: Langzeitkennwerte des Salzgehaltes (LZKS) - EasyGSH-DB: Langzeitkennwerte des Seegangs (LZSS) - EasyGSH-DB: Harmonische Analyse des Wasserstandes (FRQW) - EasyGSH-DB: Kennwerte des Seegangs (WAVS) Datenerzeugung: Die Basis der hydrodynamischen Produkte sind die gerasterteren synoptischen Hydroydnamik Daten aus dem Modell: UnTRIM-SediMorph-Unk bzw. für den Seegang (WAVS) die Modellergebnisse aus Telemac-SWAN. Verweis auf Datenerzeugeung: - EasyGSH-DB_synoptische_Hydrodynamik: Modellgrundlage UnTRIM2 - EasyGSH-DB_synoptische_Hydrodynamik: Seegangsparameter SWAN Literatur: - Hagen, R., et.al., (2019), Validierungsdokument - EasyGSH-DB - Teil: UnTRIM-SediMorph-Unk, doi: https://doi.org/10.18451/k2_easygsh_1 - Freund, J., et.al., (2020), Flächenhafte Analysen numerischer Simulationen aus EasyGSH-DB, doi: https://doi.org/10.18451/k2_easygsh_fans_2 Für die einzelnen Jahre liegen Jahreskennblätter als Kurzfassung der Jahresvalidierung auf der EasyGSH-DB (www.easygsh-db.org) zur Verfügung. Für weitere Informationen wird auf das Informationsportal (http://easygsh.wb.tu-harburg.de/) und das Downloadportal (https://mdi-de.baw.de/easygsh/) verwiesen.

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    Authors: Wiehle, Stefan; Frost, Anja; Singha, Suman;
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  • Authors: Hagen, Robert; Plüß, Andreas; Schrage, Nico; Dreier, Norman;

    Das Themengebiet synoptische Hydrodynamik von EasyGSH-DB (Erstellung anwendungsorientierter synoptischer Referenzdaten zur Geomorphologie, Sedimentologie und Hydrodynamik in der Deutschen Bucht), ist ein Teil der referenzierbaren, kontinuierlich aufbereiteten Basisdatensatz für die Deutsche Bucht. Sie sind die Grundlage der erstellten Produkte und werden zur freien Nutzung bereit gestellt. Unter diesem Metadatensatz werden die Produkte der synoptichen Hydrodynamik gelistet und verwiesen. Produkt: - EasyGSH-DB_synoptische_Hydrodynamik: Modellgrundlage UnTRIM2 - EasyGSH-DB_synoptische_Hydrodynamik: Seegangsparameter SWAN Literatur: - Hagen, R., et.al., (2019), Validierungsdokument - EasyGSH-DB - Teil: UnTRIM-SediMorph-Unk, doi: https://doi.org/10.18451/k2_easygsh_1 Für weitere Informationen und den Datendownload steht die Projektseite von EasyGSH-DB (www.easygsh-db.org) und die Informationsseite (http://easygsh.wb.tu-harburg.de/) zur Verfügung.

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    Authors: Ulrich, Johannes;

    As a result of the participation of R. V. "Meteor" in the International Indian Ocean Expedition during the winter 1964/65 altogether 37 sounding profiles were obtained in the Arabian Sea (plate 2-18). They are showing the topographic peculiarities of the main features of the sea bottom in this northwestern part of the Indian Ocean: Shelves, continental slopes and rises, deep-sea plains and hills, the Mid-Oceanic Ridge, fracture zones and seamounts. A control chart (plate 1) shows the geographical sounding lines. The coordination of the soundings with the bathymetric sketch and the map of physiographic provinces (B. C. HEEZEN and M. THARP) is represented in fig. 1 and 2. All soundings were obtained by the modern ELAC-Narrow Beam sounder which also accurately records very steep slopes of the sea bottom (fig. 3 and 4 ). Two series of sounding prnfiles (fig. 5 and 6) are showing the main topographic differences of shelf and slope between the eastern African and the western Indian continental margin. The descriptive analysis of all the sounding sections carried out by "Meteor" show the following main results: a) discovery of a very steep towering up seamount in the northern Somali basin at φ = 8° 16' N, λ 53° 12' E, which is rising up from a depth of 5000 m to about -2000 m (plate 3), b) registration of numerous steep canyons in the upper part of the eastern African continental slope near the coast of Kenya (plate 6 ), c) complete representation of a characteristic section across the Carlsberg-Ridge inclusively rift mountains and the Rift-Valley (plate 9), d) new characteristic results of sounding profiles across the Alula-Fartak trench showing very steep siopes on its flancs (plate 18).

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    Authors: Ulrich, Johannes;

    Im Rahmen einer fischereibiologischen Fahrt von F.F.S. "Anton Dohrn" in das Gebiet der Faröer wurde im Januar 1964 eine eingehende Vermessung der Rosemary-Bank (φ = 59° 15' N, λ = 10° 10' W) durchgeführt.Als geringste Tiefe der isoliert gelegenen und teilweise steil aufragenden Kuppe wurden 325 m erlotet. Das annähernd kreisförmige Gipfelplateau besitzt Tiefen zwischen 400 und 700 m gegenüber 1400 - 2100 m in der weiteren Umgebung (Tafel 1 und 2). Der unsymmetrische Kegel weist nach W und S zu ein stärkeres Gefälle auf als an seinem E-Abhang. Am Fuß umgibt ihn als auffallendste morphologische Erscheinung eine ringförmige Mulde, deren Sohle 50 - 300 m tiefer liegt als der angrenzende Tiefseeboden. Im Anschluß an die Vermessung wurden außerdem zwei benachbarte Bänke abgelotet: Lousy-Bank (φ = 60° 25' N, λ = 12° 25' W) und Bill-Baileys-Bank (φ = 60° 35' N, λ = 10° 20' W). Die Tiefenverhältnisse der Gipfelregionen beider Bänke werden ebenfalls beschrieben (Tafel 3 und 4). In the scope of a fishery biological investigation made with F.R.S. "Anton Dohrn" in the area of the Faeroer Islands in January 1964 the topography of the Rosemary Bank (φ = 59° 15' N, λ = 10° 10' W) was exactly sounded. Lowest depth of the seamount is 325 m. The nearly circular summit plateau has depths between 400 and 700 m compared with soundings of 1400 to 2100 m in the environment (table 1 and 2). The cone which is not absolutely symmetrical is more declinated to the westside than to the east. As the most destinctive morphological phenomenon a ringshaped depression is surrounding the base of thc cone directly. lt is reaching down 50 - 300 m deeper than the neighboring deep sea bottom. In addition the depths of two further banks in the neighborhood of the Rosemary Bank have been sounded and their topography is described as follows: Lousy Bank (φ = 60° 25' N, λ = 12° 25' W) and Bill Baileys Bank (φ = 60° 35' N, λ = 10° 20' W). Bathymetric charts and sounding profiles are given in table 3 and 4.

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    Authors: Wiehle, Stefan;

    Maritime SAR applications: Synthetic Aperture Radar (SAR) is an active remote sensing technology. Radar satellites emit and receive their own signals and, hence, do not need to rely on sunlight for their acquisitions. Another benefit compared to optical satellites is SARs ability to look through clouds, which means data acquisition is very reliable. Radar beams cannot penetrate water. However, the small ripple waves on the sea surface are enough to reflect the signals back to the satellite. In the maritime sector, SAR is currently being used for the detections of sea state, wind, oil spills, sea ice, icebergs and ships. These detection algorithms have been developed to run automatically in the receiving station to provide results in Near Real Time (NRT). Applications are the improvement of wave and wind models by providing data across large areas, the improvement of maritime domain awareness, and the support of vessels travelling through ice-infested waters. With the BASE-platform project, bathymetry is added to this list of maritime SAR applications.

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  • Authors: British Antarctic Survey, Cambridge (UK); Sevmorgeologija, Sankt Peterburg (RU), Alfred-Wegener-Institut, Bremerhaven (DE); Forschungsstelle für physikalische Glaziologie, Universität Münster (DE); Norsk Polarinstitutt, Oslo (NO); +1 Authors

    Thematic map and Satellite image map Filchner-Ronne-Schelfeis; Compilation of Seabed bathymetry contours (shipborne sonar measurements), Sub-glacial bedrock elevation contours (airborne radar and surface altimetry), Sub-ice shelf water column thickness (seismic sounding), and interpretation of Grounding line, Ice shelf front, Glacier and Ice stream margins (Landsat imagery); Inset maps: Location map, Geographical names diagram, Thematic data sources diagram, Sub-ice shelf water column thickness map, Five cross sections along Rutford Ice Stream, Foundation Ice Stream and Recovery Glacier to Weddell Sea, from Orville Coast across Berkner Island to Touchdown Hills, Prinzregent-Luitpold-Land and from Zumberge Coast across Berkner Island to Coats Land; Scientific preparation and Satellite imagery mosaicking and map compilation of the surrounding inland ice sheet, 17 further scientific references, Sources of English, Norwegian, Russian and German place-names, see map legendScale: 1:2000000;Projection: Lambert Stereographic; Bounding Box: POLYGON ((-90 -75, -15 -75, -15 -83, -90 -83, -90 -75));Datum: WGS72

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    Other ORP type . 1994
    License: CC BY
    Data sources: Datacite
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      Other ORP type . 1994
      License: CC BY
      Data sources: Datacite
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    Authors: Ulrich, Johannes;

    As part of the Atlantic Seamount Cruises 1967 with F.S. "Meteor" a topographic survey in the area of Great Meteor Seamount (φ = 30° 00' N, λ = 28° 30' W) was carried out from April 9th to May 1st and from May 31st to June 8th 1967. Shape and expansion of this seamount were generally known (fig. 1) but the form in detail was not yet identified by then. The length over all of the usable sounding sections with F.S. "Meteor" was 1930 nautical miles. Most of the track positions were taken by a relative reference system, that means a special navigation buoy with two radar reflectors (fig. 2). The echo soundings could be carried out with the ELAC Narrow Beam Sounder 1 CO ( extreme narrow-beam of ± 1,4° at 3 dB) giving an exact registration of even very steep slopes (fig. 3). As a result of the survey a detailed bathymetric chart of the Great Meteor Seamount could be designed ( original scale 1 : 250 000), here it is reproduced in a smaller scale (fig. 5). A model in 1:10 vertical scale exaggeration gives a general impression of the main topographical characteristics (fig. 4). It shows in the SW region of Great Meteor Seamount two other steep elevations discovered during the survey courses: Small Meteor Seamount (φ = 29° 41' N, λ = 28° 58' W) and Closs Seamount (φ = 29° 25' N, λ = 29° 08' W). Some typical sounding courses are represented in profiles (1:20 vertical scale exaggeration, fig. 6, table 1-8). Examples for slope inclination around the Great Meteor Seamount are given in a profile series exaggerated 1:10 (table 9). The Great Meteor Seamount consists of three morphological parts : a flat summit plateau (330 m - area about 1132 km2), steep slope (inclination about 13°, maximal 50°) and surrounding lower rise region (inclination < 5°). Terraces could be found in different depths at the steep slope of Great Meteor Seamount particularly at -450 m and - 550 m. Great and Small Meteor Seamount have the general shape of guyots or flattopped seamounts as described by HEss (1946), Closs Seamount shows the typical conic form of a submarine volcano. Small Meteor and Closs Seamount signify no terraces in their very steep slopes. The volume calculation based on the bathymetric chart gives the following rates : Great Meteor Seamount : 23842 km3, Small Meteor Seamount: 657 km 3, Closs Seamount about 212 km3.

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    Authors: Hatzky, Jörn;

    The thesis describes the acquisition, cleaning and visualisation of multibeam data which were collected on RV Polarstern and USCGC Healy during the Arctic Mid-Ocean-Ridge Expedition (AMORE) 2001. The data sets are combined in a high-resolution digital terrain model and a bathymetric chart of the Gakkel Ridge (8W-88E, 82N-87N). In order to process acoustic backscatter from two different sonar systems, Hydrosweep DS-2 and Seabeam 2112, an extensive software package was developed. The angle-normalised and beam pattern corrected backscatter values are compared in five areas. The variation of the backscatter strength is analysed over different rock types, sediment cores and seismogram sections that were measured by the sediment echosounder Parasound. Using angle-invariant backscatter data the Gakkel Ridge is classified in a Western Volcanic Zone (WVZ), a Sparsely Magmatic Zone (SMZ) and an Eastern Volcanic Zone (EVZ). While the basaltic WVZ and EVZ show high backscatter values the backscattering in the SMZ, consisting of mainly peridotites, is rather low. The result of the classification is verified by a second procedure in selected clusters.

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    Authors: Schenke, Hans Werner; Lemenkova, Polina;

    Heutzutage wird der Kartograph oftmals mit der Herausforderung konfrontiert, einge- scannte Papierlandkarten oder Satellitenbilder ins Vektorformat umwandeln zu müssen. Das Problem ist recht aktuell, weil sowohl Satellitenbilder als auch bathymetrische oder topographische Karten nach wir vor überwiegend im Papierformat vorkommen und daher in keinem Computersystem editiert werden können. Die Konvertierung von Pixeldateien in Vektordaten ist eine anspruchsvolle und zeitaufwändige Aufgabe. Das ideale Hilfsmittel für eine schnelle und genaue Digitalisierung, um aus Rasterdaten Vek- tordaten zu erhalten (sogenannte R2V-Programme), gibt es noch nicht, weil der Computer naturgemäß kein Verständnis für die geomorphologische Beschaffenheit des Meeresbodens hat. Eine Digitalisierungsroutine erfordert viel manuellen Einsatz, Zeit und Geduld. Die vielen Versuche, die auf dem Weg zum gewünschten Endprodukt not- wendig sind, gehen gezwungenermaßen mit Fehlern einher, bis endlich die richtigen Programmeinstellungen und der richtige Ablauf der einzelnen Arbeitsschritte gefunden ist. Besonders schwierig ist die Digitalisierung großmaßstäbiger bathymetrischer Karten, auf denen ein kompliziertes Relief dargestellt ist. Es muss nicht erwähnt werden, dass heutzutage Karten, die ausschließlich papierbasiert sind, an Wert verlieren, weil es zuviel kostet, die Karten nachzuführen und die thematischen Informationen zu ergänzen. Gleichzeitig kann auf papierbasierte Karten nicht einfach verzichtet werden (schon gar nicht, weil sie sind wie sie sind, nämlich aus Papier). Viele thematische Karten sind äußerst selten, sehr nützlich oder immer noch in Gebrauch, weil der in ihnen dargestellte Inhalt sich selbst in Jahrhunderten nicht ändert – beispielsweise bei geologischen oder tektonischen Karten. Es ist also klar, dass die Nutzung von Hilfsmitteln bei der Digitalisierung in der Kartographie eine Frage von großer Aktualität und Bedeutung ist. Dabei gilt es auch, das beste Instrument für die Zwecke der Bathymetrie zu finden. In diesem Artikel wird die Erfahrung mit AutoTrace vorgestellt, einem Hilfsmittel zur Vektorisierung, das ausgewählt wurde, weil es besonders effektiv ist und auf einer Open Source-Technologie beruht. Actually, the problem of vectorizing paper maps comes up, when the cartographer has to convert scanned paper maps or satellite imageries in vector format. This issue is of topical interest, because there are both the satellite images and bathymetric (or topographic) maps which are still largely pa- per-based and therefore uneditable in any digital system. Bitmap to vector converting is a difficult, highly time-consuming and technical task. The ideal instrument for quick and perfect digitizing of raster images to vector ones (so called R2V vectorizing software) does not exist though for the ma- chine doesn’t understand the geomorphological features and the character of the sea floor relief. That’s why the digitizing routine requires a large share of manual labour, a lot of time and patience in several trial sessions, which will necessarily contain errors to finally find out the best parameters of procedure to make a reality of our cartographic wishes. Especially difficult and tedious is to digitize large-scaled bathymetric maps with very complicated relief and geomorphological features. And it’s not to mention that nowadays paper-based maps without digital counterpart lose their value, yet making those cost a lot of money for updating and changing the thematic information on maps. At the same time, we can’t reject the paper-based maps only because they are paper-based. A lot of thematic maps are really rare, very necessary or just are to be used in mapping, e. g. geologic or tectonic maps, since their thematic information may remain the same for centuries. So it’s clear, that using of the digitizing tools in mapping and finding out the optimal instrument for the bathyme- trical purposes are questions of great actuality and importance. In this article the experience of our work with AutoTrace is presented – a vectorizer toolkit, that is chosen among others thanks to its effectiveness and open source distribution.

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  • Authors: Hagen, Robert; Plüß, Andreas; Freund, Janina; Ihde, Romina; +5 Authors

    Das Themengebiet Hydrodynamik von EasyGSH-DB (Erstellung anwendungsorientierter synoptischer Referenzdaten zur Geomorphologie, Sedimentologie und Hydrodynamik in der Deutschen Bucht), ist ein Teil der referenzierbaren, kontinuierlich aufbereiteten Basisdatensatz für die Deutsche Bucht. Unter diesem Metadatensatz werden alle Produkte der Hydrodynamik gelistet und verwiesen. Produkt: - EasyGSH-DB: Tidekennwerte des Wasserstandes (TDKW) - EasyGSH-DB: Tidekennwerte der Strömungsgeschwindigkeit (TDKV) - EasyGSH-DB: Tidekennwerte des Salzgehaltes (TDKS) - EasyGSH-DB: Tidekennwerte der Bodenschubspannung (TDKB) - EasyGSH-DB: Langzeitkennwerte des Wasserstands (LZKW) - EasyGSH-DB: Langzeitkennwerte des Salzgehaltes (LZKS) - EasyGSH-DB: Langzeitkennwerte des Seegangs (LZSS) - EasyGSH-DB: Harmonische Analyse des Wasserstandes (FRQW) - EasyGSH-DB: Kennwerte des Seegangs (WAVS) Datenerzeugung: Die Basis der hydrodynamischen Produkte sind die gerasterteren synoptischen Hydroydnamik Daten aus dem Modell: UnTRIM-SediMorph-Unk bzw. für den Seegang (WAVS) die Modellergebnisse aus Telemac-SWAN. Verweis auf Datenerzeugeung: - EasyGSH-DB_synoptische_Hydrodynamik: Modellgrundlage UnTRIM2 - EasyGSH-DB_synoptische_Hydrodynamik: Seegangsparameter SWAN Literatur: - Hagen, R., et.al., (2019), Validierungsdokument - EasyGSH-DB - Teil: UnTRIM-SediMorph-Unk, doi: https://doi.org/10.18451/k2_easygsh_1 - Freund, J., et.al., (2020), Flächenhafte Analysen numerischer Simulationen aus EasyGSH-DB, doi: https://doi.org/10.18451/k2_easygsh_fans_2 Für die einzelnen Jahre liegen Jahreskennblätter als Kurzfassung der Jahresvalidierung auf der EasyGSH-DB (www.easygsh-db.org) zur Verfügung. Für weitere Informationen wird auf das Informationsportal (http://easygsh.wb.tu-harburg.de/) und das Downloadportal (https://mdi-de.baw.de/easygsh/) verwiesen.

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    Authors: Wiehle, Stefan; Frost, Anja; Singha, Suman;
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  • Authors: Hagen, Robert; Plüß, Andreas; Schrage, Nico; Dreier, Norman;

    Das Themengebiet synoptische Hydrodynamik von EasyGSH-DB (Erstellung anwendungsorientierter synoptischer Referenzdaten zur Geomorphologie, Sedimentologie und Hydrodynamik in der Deutschen Bucht), ist ein Teil der referenzierbaren, kontinuierlich aufbereiteten Basisdatensatz für die Deutsche Bucht. Sie sind die Grundlage der erstellten Produkte und werden zur freien Nutzung bereit gestellt. Unter diesem Metadatensatz werden die Produkte der synoptichen Hydrodynamik gelistet und verwiesen. Produkt: - EasyGSH-DB_synoptische_Hydrodynamik: Modellgrundlage UnTRIM2 - EasyGSH-DB_synoptische_Hydrodynamik: Seegangsparameter SWAN Literatur: - Hagen, R., et.al., (2019), Validierungsdokument - EasyGSH-DB - Teil: UnTRIM-SediMorph-Unk, doi: https://doi.org/10.18451/k2_easygsh_1 Für weitere Informationen und den Datendownload steht die Projektseite von EasyGSH-DB (www.easygsh-db.org) und die Informationsseite (http://easygsh.wb.tu-harburg.de/) zur Verfügung.

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    Authors: Ulrich, Johannes;

    As a result of the participation of R. V. "Meteor" in the International Indian Ocean Expedition during the winter 1964/65 altogether 37 sounding profiles were obtained in the Arabian Sea (plate 2-18). They are showing the topographic peculiarities of the main features of the sea bottom in this northwestern part of the Indian Ocean: Shelves, continental slopes and rises, deep-sea plains and hills, the Mid-Oceanic Ridge, fracture zones and seamounts. A control chart (plate 1) shows the geographical sounding lines. The coordination of the soundings with the bathymetric sketch and the map of physiographic provinces (B. C. HEEZEN and M. THARP) is represented in fig. 1 and 2. All soundings were obtained by the modern ELAC-Narrow Beam sounder which also accurately records very steep slopes of the sea bottom (fig. 3 and 4 ). Two series of sounding prnfiles (fig. 5 and 6) are showing the main topographic differences of shelf and slope between the eastern African and the western Indian continental margin. The descriptive analysis of all the sounding sections carried out by "Meteor" show the following main results: a) discovery of a very steep towering up seamount in the northern Somali basin at φ = 8° 16' N, λ 53° 12' E, which is rising up from a depth of 5000 m to about -2000 m (plate 3), b) registration of numerous steep canyons in the upper part of the eastern African continental slope near the coast of Kenya (plate 6 ), c) complete representation of a characteristic section across the Carlsberg-Ridge inclusively rift mountains and the Rift-Valley (plate 9), d) new characteristic results of sounding profiles across the Alula-Fartak trench showing very steep siopes on its flancs (plate 18).

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    Authors: Ulrich, Johannes;

    Im Rahmen einer fischereibiologischen Fahrt von F.F.S. "Anton Dohrn" in das Gebiet der Faröer wurde im Januar 1964 eine eingehende Vermessung der Rosemary-Bank (φ = 59° 15' N, λ = 10° 10' W) durchgeführt.Als geringste Tiefe der isoliert gelegenen und teilweise steil aufragenden Kuppe wurden 325 m erlotet. Das annähernd kreisförmige Gipfelplateau besitzt Tiefen zwischen 400 und 700 m gegenüber 1400 - 2100 m in der weiteren Umgebung (Tafel 1 und 2). Der unsymmetrische Kegel weist nach W und S zu ein stärkeres Gefälle auf als an seinem E-Abhang. Am Fuß umgibt ihn als auffallendste morphologische Erscheinung eine ringförmige Mulde, deren Sohle 50 - 300 m tiefer liegt als der angrenzende Tiefseeboden. Im Anschluß an die Vermessung wurden außerdem zwei benachbarte Bänke abgelotet: Lousy-Bank (φ = 60° 25' N, λ = 12° 25' W) und Bill-Baileys-Bank (φ = 60° 35' N, λ = 10° 20' W). Die Tiefenverhältnisse der Gipfelregionen beider Bänke werden ebenfalls beschrieben (Tafel 3 und 4). In the scope of a fishery biological investigation made with F.R.S. "Anton Dohrn" in the area of the Faeroer Islands in January 1964 the topography of the Rosemary Bank (φ = 59° 15' N, λ = 10° 10' W) was exactly sounded. Lowest depth of the seamount is 325 m. The nearly circular summit plateau has depths between 400 and 700 m compared with soundings of 1400 to 2100 m in the environment (table 1 and 2). The cone which is not absolutely symmetrical is more declinated to the westside than to the east. As the most destinctive morphological phenomenon a ringshaped depression is surrounding the base of thc cone directly. lt is reaching down 50 - 300 m deeper than the neighboring deep sea bottom. In addition the depths of two further banks in the neighborhood of the Rosemary Bank have been sounded and their topography is described as follows: Lousy Bank (φ = 60° 25' N, λ = 12° 25' W) and Bill Baileys Bank (φ = 60° 35' N, λ = 10° 20' W). Bathymetric charts and sounding profiles are given in table 3 and 4.

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    Authors: Wiehle, Stefan;

    Maritime SAR applications: Synthetic Aperture Radar (SAR) is an active remote sensing technology. Radar satellites emit and receive their own signals and, hence, do not need to rely on sunlight for their acquisitions. Another benefit compared to optical satellites is SARs ability to look through clouds, which means data acquisition is very reliable. Radar beams cannot penetrate water. However, the small ripple waves on the sea surface are enough to reflect the signals back to the satellite. In the maritime sector, SAR is currently being used for the detections of sea state, wind, oil spills, sea ice, icebergs and ships. These detection algorithms have been developed to run automatically in the receiving station to provide results in Near Real Time (NRT). Applications are the improvement of wave and wind models by providing data across large areas, the improvement of maritime domain awareness, and the support of vessels travelling through ice-infested waters. With the BASE-platform project, bathymetry is added to this list of maritime SAR applications.

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  • Authors: British Antarctic Survey, Cambridge (UK); Sevmorgeologija, Sankt Peterburg (RU), Alfred-Wegener-Institut, Bremerhaven (DE); Forschungsstelle für physikalische Glaziologie, Universität Münster (DE); Norsk Polarinstitutt, Oslo (NO); +1 Authors

    Thematic map and Satellite image map Filchner-Ronne-Schelfeis; Compilation of Seabed bathymetry contours (shipborne sonar measurements), Sub-glacial bedrock elevation contours (airborne radar and surface altimetry), Sub-ice shelf water column thickness (seismic sounding), and interpretation of Grounding line, Ice shelf front, Glacier and Ice stream margins (Landsat imagery); Inset maps: Location map, Geographical names diagram, Thematic data sources diagram, Sub-ice shelf water column thickness map, Five cross sections along Rutford Ice Stream, Foundation Ice Stream and Recovery Glacier to Weddell Sea, from Orville Coast across Berkner Island to Touchdown Hills, Prinzregent-Luitpold-Land and from Zumberge Coast across Berkner Island to Coats Land; Scientific preparation and Satellite imagery mosaicking and map compilation of the surrounding inland ice sheet, 17 further scientific references, Sources of English, Norwegian, Russian and German place-names, see map legendScale: 1:2000000;Projection: Lambert Stereographic; Bounding Box: POLYGON ((-90 -75, -15 -75, -15 -83, -90 -83, -90 -75));Datum: WGS72

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    Authors: Ulrich, Johannes;

    As part of the Atlantic Seamount Cruises 1967 with F.S. "Meteor" a topographic survey in the area of Great Meteor Seamount (φ = 30° 00' N, λ = 28° 30' W) was carried out from April 9th to May 1st and from May 31st to June 8th 1967. Shape and expansion of this seamount were generally known (fig. 1) but the form in detail was not yet identified by then. The length over all of the usable sounding sections with F.S. "Meteor" was 1930 nautical miles. Most of the track positions were taken by a relative reference system, that means a special navigation buoy with two radar reflectors (fig. 2). The echo soundings could be carried out with the ELAC Narrow Beam Sounder 1 CO ( extreme narrow-beam of ± 1,4° at 3 dB) giving an exact registration of even very steep slopes (fig. 3). As a result of the survey a detailed bathymetric chart of the Great Meteor Seamount could be designed ( original scale 1 : 250 000), here it is reproduced in a smaller scale (fig. 5). A model in 1:10 vertical scale exaggeration gives a general impression of the main topographical characteristics (fig. 4). It shows in the SW region of Great Meteor Seamount two other steep elevations discovered during the survey courses: Small Meteor Seamount (φ = 29° 41' N, λ = 28° 58' W) and Closs Seamount (φ = 29° 25' N, λ = 29° 08' W). Some typical sounding courses are represented in profiles (1:20 vertical scale exaggeration, fig. 6, table 1-8). Examples for slope inclination around the Great Meteor Seamount are given in a profile series exaggerated 1:10 (table 9). The Great Meteor Seamount consists of three morphological parts : a flat summit plateau (330 m - area about 1132 km2), steep slope (inclination about 13°, maximal 50°) and surrounding lower rise region (inclination < 5°). Terraces could be found in different depths at the steep slope of Great Meteor Seamount particularly at -450 m and - 550 m. Great and Small Meteor Seamount have the general shape of guyots or flattopped seamounts as described by HEss (1946), Closs Seamount shows the typical conic form of a submarine volcano. Small Meteor and Closs Seamount signify no terraces in their very steep slopes. The volume calculation based on the bathymetric chart gives the following rates : Great Meteor Seamount : 23842 km3, Small Meteor Seamount: 657 km 3, Closs Seamount about 212 km3.

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    Authors: Hatzky, Jörn;

    The thesis describes the acquisition, cleaning and visualisation of multibeam data which were collected on RV Polarstern and USCGC Healy during the Arctic Mid-Ocean-Ridge Expedition (AMORE) 2001. The data sets are combined in a high-resolution digital terrain model and a bathymetric chart of the Gakkel Ridge (8W-88E, 82N-87N). In order to process acoustic backscatter from two different sonar systems, Hydrosweep DS-2 and Seabeam 2112, an extensive software package was developed. The angle-normalised and beam pattern corrected backscatter values are compared in five areas. The variation of the backscatter strength is analysed over different rock types, sediment cores and seismogram sections that were measured by the sediment echosounder Parasound. Using angle-invariant backscatter data the Gakkel Ridge is classified in a Western Volcanic Zone (WVZ), a Sparsely Magmatic Zone (SMZ) and an Eastern Volcanic Zone (EVZ). While the basaltic WVZ and EVZ show high backscatter values the backscattering in the SMZ, consisting of mainly peridotites, is rather low. The result of the classification is verified by a second procedure in selected clusters.

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