GASH RIVER FLOODS, August 2003

Villages on the Kassala-Port Sudan road,
between Aroma and Eriba (Sudan)


The (speckle filtered) images and the damage assessment map (processing by ParBleu Technologies Inc.) are produced in cartographic projection UTM WGS 1984 (Zone 37), at a spatial resolution of 20 meters x 20 meters.


Extent of Damages :

The (speckle filtered) images below cover a 10 km x 10 km area, located between Aroma and Eriba.
The main road Kassala-Port Sudan runs South-North on the right side of the images.

Archive RADARSAT-1 Image (1999) RADARSAT-1 Image (24 August 2003)

The brighter areas correspond to moister soils. Therefore, the areas that went brighter in the RADARSAT-1 image acquired on August 24, 2003 show an important excess in water content with respect to the 1999 situation.
This effect affects important cultivated areas, in particular west of the main road Kassala-Port Sudan.

Bright dots correspond to houses. Along the main road, most of the houses that were visible in 1999 were still present on August 24, 2003.

On the other hand, almost all the houses located west of this road (well visible in the 1999 image) are no longer present on August 24, 2003.
They are assumed to have been heavily damaged, or even destroyed.


Damage assessment map :

The size of the area shown is 13.5 x 28.0 kilometers.
UTM geographic coordinates are indicated on the map.
The main road Kassala-Port Sudan runs South-North on the right side of the map.

Interpretation keys :

On this map, the areas exhibiting blue tones (with the exception of the mountain areas) correspond to the areas that have been flooded.
The areas exhibiting red tones correspond to soils presenting a strong excess in moisture content.
Agricultural fields located within such areas are likely to be heavily damaged. It is clear that most part of the agricultural fields have suffered from the effect of heavy rainfall and/or floods.

Urban areas exhibiting blue tones correspond to damages suffered by housing.
No very significant changes are detected on the road itself (white dots).
In turn, almost all settlements west of the main road have disappeared on August 24, 2003 (indicated as blue dots on the map).

Areas exhibiting grey tones are those which have not been affected by the rains and the floods.


Produced by PARBLEU TECHNOLOGIES Inc.
under mandate of the CANADIAN SPACE AGENCY.

(Standing Offer for Disaster Management Information Products and Services; PWGSC File Number 9F028-014927/A)
Procurement of the original RADARSAT-1 SAR data: Canadian Space Agency, and Radarsat International Inc.
Original RADARSAT-1 images: Copyright Canadian Space Agency / Agence Spatiale Canadienne, 2003.


Copyright (C) PARBLEU Technologies Inc., August 2003