Land cover change detection using NOAA AVHRR images taken from 1989 to 2002 for the Eastern part of the Mediterranean region as a tool to support decision-making

Gitas I.Z., Mitri G.H., Barbosa P.M., Assad N., Jomaa I., Papageorgiou C., Turk T.

In this study, the Advanced Very High Resolution Radiometer (AVHRR), precisely LAC/HRPT data, were used to monitor vegetation change in the Mediterranean. Pre-processing of satellite images prior to image classification was performed. Two change detection techniques were tested using NOAA-AVHRR images for detecting areas of changes in the Eastern region of the Mediterranean. The change detection techniques considered were Vegetation Indices (VI) differencing and Multidate Unsupervised Classification (MUC). The Vegetation Indices (VI) used in this study were the Normalized Difference Vegetation Index (NDVI) and the Soil Adjusted Vegetation Index (SAVI) which have proved to be good indicators of vegetation vigour. The significant changes identified from the images taken between 1989 and 2002 were found to be similar when the two different techniques (VI differencing and MUC) were applied. Most of the changes occurred in bare soil areas converted to agricultural lands.

Dans cette étude, le radiomètre avancé à très haute résolution (AVHRR) et plus précisément les données LAC/HRPT, ont été utilisés pour détecter les changements de végétation en Méditerranée orientale. Le prétraitement d'images satellites avant la classification a été exécuté. Deux techniques de détection de changements ont été évaluées en utilisant les images NOAA-AVHRR. D'une part, les indices de végétation (VI) Normalized Difference Vegetation Index (NDVI) et le Soil Adjusted Vegetation Index (SAVI) qui se sont avérés être de bons indicateurs de végétation et d'autre part, la classification multitemporelle non surveillée (MUC). Les changements significatifs identifiés à partir des images prises entre 1989 et 2002 sont semblables pour les deux techniques et concernent des sol nus convertis en terres agricoles.

Mots-clés    

AIDE A LA DECISION, COUVERTURE DU SOL, IMAGERIE PAR SATELLITE, RADIOMETRE AVANCE A TRES HAUTE RESOLUTION, REGION MEDITERRANEENNE, TELEDETECTION, TRAITEMENT D'IMAGES

Citer cet article    

Gitas I.Z., Mitri G.H., Barbosa P.M., Assad N., Jomaa I., Papageorgiou C., Turk T. Land cover change detection using NOAA AVHRR images taken from 1989 to 2002 for the Eastern part of the Mediterranean region as a tool to support decision-making. In : Gitas I.Z. (ed.), San Miguel Ayanz J. (ed.). Environmental monitoring in the South-Eastern Mediterranean region using RS/GIS techniques. Chania : CIHEAM, 2003. p. 51-55. (Options Méditerranéennes : Série B. Etudes et Recherches; n. 46). http://om.ciheam.org/om/pdf/b46/00800526.pdf