The Weser estuary at the German North Sea coast serves as a fairway to the harbours of Bremerhaven and Bremen. To ensure safe shipping and navigation, the navigation channel depths are nowadays intensively monitored, and have been so in the past. These are valuable data for consulting and research purposes, and enables investigations leading to a better understanding of hydrodynamics, salt intrusion and morphological processes in the estuary, in the present as well as the past.
For recent years, thanks to modern monitoring techniques and digitalization, measuring data has been compiled to consistent digital terrain models of high quality and accuracy. For time periods before the 1990ies however, measurements were scarcer and the data are available only in form of printed bathymetrical and nautical charts.
The objective of the project “Historical system states of the Weser estuary (HIWEST)” was to:
• digitalize depths measurements starting from 1960,
• georeference the data points and
• process and compile them to digital terrain models that can be used for research and consulting.
The project was led and financed by the Federal Waterways Engineering and Research Institute (BAW). It was supported by the Federal Maritime and Hydrographic Agency (BSH) and by the German Water and Shipping Administration (WSV) who provided printed charts and scanned data sets. The smile consulting GmbH was contracted to process the data and compile digital terrain models.
One of the main challenges of the project was georeferencing. While georeferencing and projecting in the horizontal domain was comparatively straightforward, the transformation of depths below different chart datums to the Germans mean height reference system represented a challenge. This was accomplished by an algorithm considering spatial polygons provided by BSH and further meta information on the different levelling systems.
The accuracy of the data sets differs depending on the quality of the original data. Since the 1990ies, powerful measurement methods such as airborne laser scanning (ALS) and multibeam echo-sounding has led to high resolutions and high data accuracy. In past surveys, the depths were measured in single-beam echo-soundings, often along individual cross sections, and there is no information between these soundings. As a result, the older terrain models are much smoother then the newer ones and contain less detailed information. More technical details can be found in the appendix of the technical report.
The following digital terrain models (DTM, in the following the German abbreviation DGM is used) of the Lower and Outer Weser estuary were made available:
• DGM 1966, marking the situation before deepening the Outer Weser to SKN-12 m
• DGM 1972, marking the situation before deepening the Lower Weser to SKN-9 m
• DGM 1981, marking the situation before extensive river works in the Lower Weser
• DGM 1996, marking the situation before deepening the Outer Weser to SKN-14 m
• DGM 2002, marking the situation after deepening the Outer Weser to SKN-14 m, reference digital terrain model.
The years were chosen so they would represent consistent periods not affected by constructive engineering measures such as channel deepenings, and secondly based on optimal data availability. Each data set however consists not only of data from the respective year, but data had to be added from adjacent years. To close gaps, data from recent surveys were used. The data sets span the whole estuary from the North Sea to the tidal weir in the city of Bremen and are available as 1x1 m raster data sets.
How to cite the HIWEST data:
The data set is only to be quoted together with the Technical Report.
Report:
Bundesanstalt für Wasserbau (2021): Historical digital terrain models of the Weser Estuary (HIWEST). Technical Report B3955.02.04.70168-6. Bundesanstalt für Wasserbau. https://henry.baw.de/handle/20.500.11970/107521
Data set:
Bundesanstalt für Wasserbau (2020): Historical digital terrain model data of the Weser Estuary (HIWEST) [Data set]. Bundesanstalt für Wasserbau. https://doi.org/10.48437/02.2020.K2.5200.0001
Description
Historical digital terrain model data of the Weser Estuary (HIWEST) / Historische Daten für Systemzustände des Weser-Ästuars (HIWEST)
Bibliographical Information
Bibliography (1)
Citation for this dataset
Digital Object Identifier (DOI)
| ID | Type |
|---|---|
| 10.48437/02.2020.K2.5200.0001 | Dataset |
Temporal Reference
Space/Time
Geothesaurus-Reference
| SW Longitude/Latitude (WGS84) | NO Longitude/Latitude (WGS84) | |
|---|---|---|
| Raumbezug des Datensatzes | 8.11°/53.047° | 8.872°/53.986° |
| Nordsee | 6.368°/53.372° | 9.011°/55.103° |
Hight
| Min | Max | Unit | Vertical Datum |
|---|---|---|---|
| 0.0 | 0.0 | Metre | DE_DHHN92_NH |
| Infos on Spatial Relation |
The maximum and minimum heights were not determined for the metadata set. The heights change with different data sets. |
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| Spatial Reference System |
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References
Downloads (5)
Usage
| Use Constraints |
Creative Commons Namensnennung 4.0 InternationalSource: Bundesanstalt für Wasserbau Quellenvermerk: Bundesanstalt für Wasserbau |
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| Access Constraints |
no limitations to public access |
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| Use Limitations |
To be used for teaching and research, not suitable for navigation. |
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Contact
Originator
|
Bundesanstalt für Wasserbau Abteilung Wasserbau im Küstenbereich
Wedeler Landstr. 157
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Thematic Reference
Technical Informationen
| Identifikator |
https://registry.gdi-de.org/id/de.bund.baw/b5197961-56e8-4e7f-bc35-6596341f088e |
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| Digital Representation |
Grid |
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Scale
| Ground-Resolution |
1.0 m |
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| Thematic Reference |
Processing the historical bathymetries of the Weser estuary to produce consistent topographies. Derivation of digital terrain models by spatial and temporal interpolation for the years 1966, 1972, 1981, 1996 and completing the base digital terrain model 2002. List of data appendices: Technical Report, BAW (2021): Historical digital terrain models of the Weser Estuary (HIWEST).
|
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| Underlying Data |
Digital terrain model (DTM) Model A: Bathymetric data of one decade, considering only data not influenced by construction measures. Digital terrain model (DTM) corresponds to Model A from Technical Report is available. It includes bathymetric data of one decade, considering only data not influenced by construction measures. The data gaps in which no suitable data from the respective period was found, were not closed. |
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Additional Information
| Data Usage Information |
These is data for consulting and research purposes, and enables investigations leading to a better understanding of hydrodynamics, salt intrusion and morphological processes in the estuary, in the present as well as the past. |
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| Dataset Language |
English |
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Conformity
| Specification of conformity | Date of conformity | Grade of conformity | checked with |
|---|---|---|---|
| COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services | 08.12.2010 | Historical digital terrain models of the Weser Estuary (HIWEST). Technical Report B3955.02.04.70168-6. |
Data Format
| Name | Version | Compression | Specification |
|---|---|---|---|
| Digital terrain model | 1.0 | xyz | DTM |
| Ordering Instructions |
Fees: No conditions apply |
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Keywords
| Inspire-Themes | Elevation |
| ISO - Topic Category | Elevation |
| Search Terms | Bathymetrie Bundeswasserstraßen-ID: 5200 Digital terrain model (DTM) Digitales Geländemodell (DGM) Geografie Geomorphologie historisch opendata opendata Relief Sea Tiefenmessung Topographie Umwelt Waterways and water bodies Weser Estuary Weser Ästuar |