[GRASS5] howto: png to DEM?

Hi, hopefully a easy one:

How to transform a png-image with often interrupted contour lines into elevation data?

Attached please find a small tile to show data quality. The original image size is 4300x2800 pixel and transforms into more than 5600 vector snippets.

Thanks in advance for any hint!

Mit freundlichen Grüßen / With kindest regards

Stefan Paulick

http://www.urbeli.com
mailto://stefan.paulick@urbeli.com
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rast2.png