data image iddateareadem esp_011562_17552009-01-131dem_24102 esp_025368_17552011-12-251dem_24102...

DataImage ID Date Area DEM

ESP_011562_1755 2009-01-13 1 DEM_24102

ESP_025368_1755 2011-12-25 1 DEM_24102

PSP_009505_1755 2008-08-06 2 DEM_9505

ESP_023957_1755 2011-09-06 2 DEM_9505

PSP_003453_1750 2007-04-22 3 DEM_18854

ESP_018854_1755 2010-08-04 3 DEM_18854

PSP_001488_1750 2006-11-20 4 DEM_24234

ESP_024234_1755 2011-09-27 4 DEM_24234

PSP_009861_1755 2008-09-02 2 DEM_9505

ESP_024023_1755 2011-09-11 2 DEM_9505

List of images that were identified as potential source for surface change detection and processed according to the workflow presented above. “Area” refers to the location illustrated in the next slide, and DEM refer to the DEM ID supplied by JPL

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1

3

4

2

Area of interest as indicated by JPL

3.5km

Area 2Images analyzed:

PSP_009505_17552008-08-06

ESP_023957_17552011-09-06

3 years, 1 month

1 km

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-2.3 m 0.5-1.4 m 1.7

Sand ripples displacement map in the East/West direction (Eastward positive)

Sand ripples displacement map in the North/South direction (Northward positive)

All dunes in the area 2 footprint are subject to ripples migration. The direction of the ripple migration is mostly North/South, although strong uncorrected satellite jitter in the East/west direction prevent from measuring the eastward component of the ripples migration. On average ripples migration of 1.5-2 meters in the 3 years, 1 month time frame is observed.

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Area 3Images analyzed:

PSP_003453_17502007-04-22

ESP_018854_17552010-08-04

3 years, 3 months

1 km

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-2.7 m 0.5-2.5 m 1.0

Sand ripples displacement map in the East/West direction (Eastward positive)

Sand ripples displacement map in the North/South direction (Northward positive)

All dunes are subject to ripples migration; migration amplitude of more than 2 meters in the 3 years, 3 months time frame is observed on several dunes.

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Orientation of the ripples migration over the 3 years, 3 months period

Orientation is in accordance with dune shape and evolves from a South direction to a South-East direction the further we go south on the dune field

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