Marine and coastal remote sensing Algeria national capabilities The ALSAT microsatellite programme

Remote sensing are becoming a cost-effective techniques Computer technology, Information networks, improvements in sensing systems for satellites.

Satellite imagery can used for observing marine features such as: large-scale circulation, currents, river outflow and water quality. This can be visualized by highlighting variations in water color and/or temperature.

These observations can be used for activities such as environmental monitoring of sensitive coastal zones, hazards assessment, and management of fishing fleets.

Small satellites are enabling developing countries to acces space technology AlSat-1 (Algerian Satellite), an enhanced microsatellite is Algeria's first national satellite. It has been designed and constructed by SSTL (Surrey Space Technology Laboratory) at the Surrey Space Centre (UK). ALSAT-1 is part of an international collaboration of Earth observation satellites specifically designed for disaster monitoring, called Disaster Monitoring Constellation – DMC-.

ALSAT-1 CARACTERISTICS Earth observation Microsatellite Size: 60 x 60 x 60 cm Mass: 90 kg Lifetime: 5 years Launch Date : 28 Novembre 2002 (Plesetsk Cosmodrome, Russia) Orbit: 680 km (sun-synchronous) Inclination: 98.1° Time : 9h30 Operated by: CNTS (Centre National des Techniques spatiales)

AlSat-1

Number of Pixels: 10200/camera Resolution: 32m Spectral Bands Green (0, 523 – 0, 605 µm) Red (0, 629 – 0,690 µm) Near Infrared (0, 774 – 0, 900 µm) Number of Pixels: 10200/camera Resolution: 32m Image size: 600 x 560 km (336.000 km²) Observation: Only 3 images to observe 1500km Algerian coast

Trichromie d’Images brutes Alsat-1 prises le 15 juillet 2003 à 9h 27’

Image traitée Alsat-1 du 18 Août 2003 à 9h 37’ Trace apparente de 8 Km de long Image traitée Alsat-1 du 18 Août 2003 à 9h 37’

Détection de la pollution au niveau du port Arzew El Djedid Image Alsat-1 de Février 2004

Détection des rejets Image Alsat-1 du 09 Août 2004

Image Alsat-1 du 09 Août 2004

Image Alsat-1 du 06 Août 2004

O. Seybouse O. Mafragh Image Alsat-1 du 06 Août 2004

Pollution au niveau de l’embouchure de l’oued el Harrach Image ALSAT-1 du 10 mars 2003 de la baie d’Alger

La circulation dans la Baie d’Arzew ALSAT-1 25 CN 55CN La circulation dans la Baie d’Arzew Image ALSAT-1 du 01/03/2003

ALSAT-1 25 CN 55CN Image ALSAT-1 du 26/08/2003

ALSAT-1 25 CN 55CN Image ALSAT-1 du 31/08/2003

25 CN 55CN Image ALSAT-1 du 21/09/2003

25 CN 55CN Image ALSAT-1 du 30/11/2003

ALSAT-1 25 CN 55CN Image ALSAT-1 du 13/12/2003

Circulation générale du 26/08/03 au 13/12/03 Arzew

Conclusion Alsat-1 products are free of charge for the marine science community and to the end users Alsat-1 products along with products of other satellites of the DMC will be used as part of the national marine information database. marine science community is actively participating in the calibration of Alsat-2 senors