Map without borders

3D digital map of Saxon-Bohemian Switzerland published

Affensteine ​​in the Saxon Switzerland National Park Holm Riebe / Saxon Switzerland National Park Authority (SBS)
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It took three years, and now it's finally finished: the digital 3D map of Saxon-Bohemian Switzerland, created by researchers at the Dresden University of Technology. For example, with the help of digital data, runoff modeling of flood scenarios can be calculated much more accurately in the future.

But also for the processing of trail concepts, for the investigation of erosion in heavy rainfall, the assessment of construction projects or the documentation of the forest stands, the data should be available.

And even for archaeologists, the digital 3D map is interesting: With the help of the laser-measured soil model, a Bronze Age rampart - about 11th to 9th century BC - could already be identified on the west side of the Pfaffenstein. This was not recognizable in the normal aerial view by the dense tree population locally.

16 surveying flights needed

In order to scan the area of ​​the National Park region, the scientists of the TU Dresden carried out 16 surveying flights on eleven days in April 2005 as part of their project. A digital camera specialized for such applications and a laser scanner were used on board the surveying aircraft.

The high-resolution digital camera recorded the entire landscape photorealistically in the spectral channels blue, green, red and infrared. With the laser scanner, the scientists measure the earth's surface. This resulted in about six measurement points per square meter. These six billion data points were first prepared by the researchers. Then they calculated a digital terrain model with a grid spacing of one meter. display

Relief model made of plastic

Eighteen months later, the digital data of Saxon-Bohemian Switzerland could be handed over to the responsible administrations of the protected area. The three-year project at the Institute of Photogrammetry and Remote Sensing of the TU Dresden thus concluded. The digital data can now be accessed by all three administrations of the almost 800 square kilometer National Park region, across borders.

At the TU Dresden, moreover, a circa 1.6 square meter plastic relief model was produced. This has been exhibited since February 2007 in the National Park Information Center in Bad Schandau and should also make the typical landscape tangible.

(idw - Dresden University of Technology, 02.08.2007 - DLO)