On Monday NASA announced that 'recurring slope lineae' and hydrated salts discovered on the sides of craters are proof of water flow on Mars. A new Esri Story map, Discovering Liquid Water on Mars, provides a great illustration of these recurring slope lineae using NASA imagery and maps of Mars.
The story map uses imagery from the Horowitz, Hale, Garni and Palikir craters to show examples of these dark streaks which are caused by subsurface water flow. In particular the timelapse images from the Palikir and Horowitz craters do a great job at showing how the streaks appear, lengthen and vanish with the passing of seasons on Mars.
Discovering Liquid Water on Mars also allows you to view the location of each of the four craters on a satellite map and an elevation map of Mars.
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