European Space Imaging captured 30 cm resolution images of the area using the WorldView-4 satellite on November 21. The images clearly show the damage wrought by the torrents of water and mud, and the path the water took as it flowed down the sides of the mountains and into gullies.

Earth-colored water flooded the streets of Mandra, and is clearly visible in satellite photos.
📷  21/11/2017 by WorldView-4 @ 30 cm resolution
© European Space Imaging

“The satellite images were made immediately available to the Space Applications and Remote Sensing Institute of National Observatory of Athens for the purpose of planning and maintaining situational awareness of the event in collaboration with first responders and government agencies," said Vana Giavi, Managing Director of TotalView, European Space Imaging's partner in Greece.

It has been reported that inappropriate urban development may have been a major contributing factor to the event's severity, as natural floodways have been blocked by unlicensed construction.

"The very high resolution satellite imagery will be an invaluable tool for the Greek government to detect the presence of illegal buildings, and to plan future flood-prevention infrastructure," said Adrian Zevenbergen, Managing Director of European Space Imaging.

Industrial buildings to the north of Mandra were hit by the flow of mud and water.
📷 21/11/2017 by WorldView-4 @ 30 cm resolution
© European Space Imaging

The pathways the water took into and through Mandra are clearly visible.
📷 21/11/2017 by WorldView-4 @ 30 cm resolution
© European Space Imaging

Satellite image of Mandra before the flooding.
📷  4/10/2017 by WorldView-4 @ 40 cm resolution
© European Space Imaging