Visualization of Weida dam, Germany:

Concept study general renovation vs. dismantling of the

Weida dam

Simulation of usage scenarios of the Weida dam by merging geodata

September 2016

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I. Overview of Weida dam

II. Visualization aims

III. Usage scenarios

IV. Methodology:

I. Data

II. Technologies

Agenda

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I. Overview of Weida dam

Quelle:Google Maps

Weida dam

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I. Overview of Weida dam

• in operation since1956

• main dam wall & minor side wall for flood discharge

• reservoir volume: 9,6 Mio m³

• reservoir area: 92 ha, length 4,5 km

• maximum water level: 22,5 m

• height of the main dam wall: 32,5 m

• catchment area: 163 km²

• functions:

• drinking water (until 2012)

• flood protection

• low water elevation during droughts

• under monument protection

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I. Overview of Weida dam

background information: urgent restoration requirements of the dam and the facilities although the dam is

no longer needed.

What should happen with the dam?

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II. Visualization aims

• client: free state of Thüringen

Thüringen water supply company TFW (AöR)

• presentation of the possible secondary use concepts for general public

• visual presentation as a basis for further discussion

• mediation between the government and general public

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III. Usage scenarios

Development of 4 secondary use concepts

for the further usage of dam:

scenario 1: preservation of the dam – general restauration

scenario 2: preservation as a technical monument

scenario 3: part-dismantling of the dam wall

scenario 4: full dismantling

developement of a concept regarding

the data and technologies

the visualization in TerraGen (script)

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IV. Methodology

For the visualization different kinds of data and technologies have been used:

Data:

• elevation data: Digital Terrain (DTM) from LiDAR, UAV (drone), Bathymetry

• optical data: Airborne Orthophoto 50cm, UAV Orthophoto 20 cm and 2 cm

• 3D-models: CAD-Data

Technologies:

• remote sensing

• photogrammetry

• survey

• bathymetry

• 3D-modeling

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IV. Methodology: elevation data (DEM)

For the generation of a high resolution digital elevation model (DEM) elevation data from

• Airborne Laserscaning (LiDAR),

• bathymetric survey and

• photogrammetric analysis of UAV-imagery

has been used.

Specifications:

• LiDAR DTM: 2 m Raster (DGM2), accuracy: +/- 30 cm horizontal, +/- 15 cm vertical

• UAV DSM (digital surface model: 10 cm Raster)

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IV. Methodology: optical data: airborne orthophoto

An orthophoto is a geometrically undistorted image. This can be recorded by UAV, airplane

or satellite.

Specifications:

• 50 cm resolution

• RGB true color

• 8 bit colors

• geometrically corrected

the image will be used as a „wallpaper“

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IV. Methodology: optical data: UAV

By using a UAV (unmanned aerial vehicle) a flying campaign was carried out in the area of

the main dam wall and auxiliary dam

• Camera: Sony Alpha 6000, 19 mm wide angle lens

• Hexacopter

Processing of the photos for the generation of

• digital surface model, accuracy: 10 cm (LiDAR: 2 m!)

• orthophoto with 5 cm (!) resolution

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IV. Methodology: 3D-Models

Building structures as well as modified 3D-models were processed/modeled in AutoCAD and

SketchUp.

For the 3D-models data formats like

• *.dwg

• *.fbx

• *.obj

• *.skp (SketchUp)

were combined and processed.

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IV. Methodology: Technologies

• remote sensing

• photogrammetry

• survey

• bathymetry

• 3D-modeling

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Thank you for listening!