Marine and coastal remote sensing

Marine and coastal Marine and coastal remote sensingremote sensingAlgeria national capabilitiesAlgeria national capabilities

The ALSAT microsatellite programme

Remote sensing are becoming a Remote sensing are becoming a cost-effective techniquescost-effective techniques

Computer technology,Computer technology, Information networks,Information networks, improvements in sensing systems for improvements in sensing systems for

satellites.satellites.

Satellite imagery can used for Satellite imagery can used for observing marine features such as:observing marine features such as:

large-scale circulation, currents, large-scale circulation, currents, river outflow and water quality.river outflow and water quality.

This can be visualized by highlighting This can be visualized by highlighting variations in water variations in water colorcolor and/or and/or temperaturetemperature..

These observations can be used for These observations can be used for activities such asactivities such as

environmental monitoring of sensitive environmental monitoring of sensitive coastal zones, coastal zones,

hazards assessment, and hazards assessment, and management of fishing fleets. management of fishing fleets.

Small satellites are enabling developing Small satellites are enabling developing countries to acces space technologycountries to acces space technology

AlSat-1 (Algerian Satellite), an enhanced AlSat-1 (Algerian Satellite), an enhanced microsatellite is Algeria's first national satellite.microsatellite is Algeria's first national satellite.

It has been designed and constructed by SSTL It has been designed and constructed by SSTL (Surrey Space Technology Laboratory) at the (Surrey Space Technology Laboratory) at the Surrey Space Centre (UK).Surrey Space Centre (UK).

ALSAT-1 is part of an international collaboration ALSAT-1 is part of an international collaboration of Earth observation satellites specifically of Earth observation satellites specifically designed for disaster monitoring, called designed for disaster monitoring, called Disaster Disaster Monitoring ConstellationMonitoring Constellation – DMC-. – DMC-.

ALSAT-1 CARACTERISTICSALSAT-1 CARACTERISTICSEarth observationEarth observation Microsatellite Microsatellite

Size:Size: 60 x 60 x 60 cm60 x 60 x 60 cmMass:Mass: 90 kg90 kgLifetime:Lifetime: 5 years5 yearsLaunch Date :Launch Date : 28 Novembre 2002 28 Novembre 2002

(Plesetsk Cosmodrome, Russia)(Plesetsk Cosmodrome, Russia) Orbit:Orbit: 680 km (680 km (sun-synchronoussun-synchronous))Inclination:Inclination: 98.1°98.1°Time :Time : 9h309h30Operated by:Operated by: CNTS (Centre National des CNTS (Centre National des

Techniques spatiales)Techniques spatiales)

AlSat-1AlSat-1

Spectral BandsSpectral Bands

Green Green (0, 523 – 0, 605 µm)(0, 523 – 0, 605 µm)Red Red (0, 629 – 0,690 µm)(0, 629 – 0,690 µm)Near Infrared Near Infrared (0, 774 – 0, 900 µm)(0, 774 – 0, 900 µm)Number of Pixels:Number of Pixels: 10200/camera10200/cameraResolution:Resolution: 32m32mImage size:Image size: 600 x 560 km (600 x 560 km (336.000 km²)336.000 km²)

Observation: Observation: Only 3 images to Only 3 images to observe observe 1500km 1500km Algerian coast Algerian coast

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

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 portArzew El Djedid

Image Alsat-1 de Février 2004

Détection des rejetsDétection des rejets

Image Alsat-1 du 09 Août 2004

Image Alsat-1 du 09 Août 2004

Image Alsat-1 du 06 Août 2004

Image Alsat-1 du 06 Août 2004

O. Seybouse

O. Mafragh

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’ArzewLa circulation dans la Baie d’Arzew

Image ALSAT-1 du 01/03/2003Image ALSAT-1 du 01/03/2003

25 CN

55CN

Image ALSAT-1 du 26/08/2003Image ALSAT-1 du 26/08/2003

25 CN

55CN

Image ALSAT-1 du 31/08/2003Image ALSAT-1 du 31/08/2003

25 CN

55CN

Image ALSAT-1 du 21/09/2003Image ALSAT-1 du 21/09/2003

25 CN

55CN

Image ALSAT-1 du 30/11/2003Image ALSAT-1 du 30/11/2003

25 CN

55CN

Image ALSAT-1 du 13/12/2003Image ALSAT-1 du 13/12/2003

25 CN

55CN

Circulation généraleCirculation généraledu 26/08/03 au 13/12/03du 26/08/03 au 13/12/03

Arzew

ConclusionConclusion

Alsat-1 Alsat-1 products are free of charge for the products are free of charge for the marine science community and to the end usersmarine science community and to the end users

Alsat-1 products along with products of other Alsat-1 products along with products of other satellites of the DMC will be used as part of the satellites of the DMC will be used as part of the national marine information database.national marine information database.

marine science community is actively marine science community is actively participating in the calibration of Alsat-2 senors participating in the calibration of Alsat-2 senors