Historical digital terrain model data of the Weser Estuary (HIWEST)

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</li>

• DGM 1972, marking the situation before deepening the Lower Weser to SKN-9 m</li>

• DGM 1981, marking the situation before extensive river works in the Lower Weser</li>

• DGM 1996, marking the situation before deepening the Outer Weser to SKN-14 m</li>

• 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:

<strong style="color: red;"> The data set is only to be quoted together with the Technical Report.</strong>

Report:

Bundesanstalt für Wasserbau (2020): 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

Citation proposal
Bundesanstalt für Wasserbau (2020) . Historical digital terrain model data of the Weser Estuary (HIWEST). Bundesanstalt für Wasserbau https://gdk.gdi-de.org/geonetwork/srv/api/records/b5197961-56e8-4e7f-bc35-6596341f088e

INSPIRE
SDS

INSPIRE

Identification

File identifier: b5197961-56e8-4e7f-bc35-6596341f088e XML

Hierarchy level: dataset Dataset

Online resource

Resource identifier

code: https://registry.gdi-de.org/id/de.bund.baw/b5197961-56e8-4e7f-bc35-6596341f088e

code: https://doi.org/10.48437/02.2020.K2.5200.0001

Metadata language: English

Spatial representation type: Grid

Encoding

Format: Digital terrain model

Version: 1.0

Specification: DTM

Projection

Classification of data and services

Topic category

Elevation

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Höhe

UMTHES Thesaurus ( Theme )

Gewässervermessung
Topographie
Geomorphologie
Geländerelief

Other keywords

Keywords

Sea
Weser Estuary
Digital terrain model (DTM)
Waterways and water bodies
Bundeswasserstraßen-ID: 5200
Weser Ästuar
Digitales Geländemodell (DGM)
historisch
Tiefenmessung
Geografie
opendata

Keywords

opendata

Keywords ( Theme )

ENVI

Geographic coverage

Temporal reference

Temporal extent

Date ( Publication ): 2020-10-09T00:00:00.000+02:00

Date ( Creation ): 2020-10-09T00:00:00.000+02:00

Quality and validity

Lineage

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.

<p>List of data appendices:</p>

Technical Report, BAW (2021): Historical digital terrain models of the Weser Estuary (HIWEST).

<ul>

<li>DTM data sheet HIWEST</li>

<li>Technical Report smile consulting GmbH (2018): Aufbereitung historischer Bathymetrien der Weser zu konsistenten

DGMs (HiWest) Leistungsphasen 1-3. Hg: smile consulting GmbH, Hannover.</li>

</ul>

Distance: 1.0 meter

Conformity

Explanation: Historical digital terrain models of the Weser Estuary (HIWEST). Technical Report B3955.02.04.70168-6.

Restrictions on access and use

Access constraints: Creative Commons Namensnennung 4.0 International

Access constraints: Quellenvermerk: Bundesanstalt für Wasserbau <Jahr des Datenbezugs>

Access constraints: {"id":"CC BY 4.0","name":"Creative Commons Namensnennung 4.0 International","url":"https://creativecommons.org/licenses/by/4.0/deed.de","quelle":"Bundesanstalt für Wasserbau <Jahr des Datenbezugs>"}