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From 1960's to 1970's, the Chinese Army built some fortified artificialhills. Some of them are located in the Inner Mongolia, Western China. Theselarge fortresses are surrounded by moats. For some of them it is still possibleto see earthworks, trenches and ditches, the planning of which could have asymbolic meaning. We can argue this result form their digital outlining,obtained after an image processing of satellite images, based on edgedetection.

The fortresses of Ejin: an example of outlining a site from satellite images