, Volume 413, Issue 0, pp 127–133

Mangrove mapping in North-Western Madagascar using SPOT-XS and SIR-C radar data


  • Vanina Pasqualini
    • 1IRD, Maison de la Télédétection
    • Université de Corse, Equipe ≪Ecosystèmes Littoraux≫
  • Jacques Iltis
    • IRD, Laboratoire d'Etudes Rurales
  • Nadine Dessay
    • 1IRD, Maison de la Télédétection
  • Marc Lointier
    • 1IRD, Maison de la Télédétection
  • Olivier Guelorget
    • Laboratoire d'Hydrobiologie Marine, UMR 5556 CNRSUniversité Montpellier II
  • Laurent Polidori
    • 1IRD, Maison de la Télédétection

DOI: 10.1023/A:1003807330375

Cite this article as:
Pasqualini, V., Iltis, J., Dessay, N. et al. Hydrobiologia (1999) 413: 127. doi:10.1023/A:1003807330375


Within the framework of an environmental impact study of aquaculture activities in the coastal marsh of Mahajamba (North-Western Madagascar), an assessment of the environmental conditions existing prior to the onset of aquaculture activities (production began in October, 1993) is essential. To this end, the area was mapped using SPOT-XS data, which made it possible to define the main ecodynamic tendencies of the mangroves before the development of the rearing ponds. The aim was then to implement fast, precise and reliable mapping methods, making it possible to follow mangrove alterations resulting from these aquaculture activities. Analysis of the radiometric behaviour of the various plant formations of the marsh, based on SIR-C radar data, revealed that the discrimination between these formations is easier when the frequency used is low and the polarization is crossed. Thematic analysis using textural classification was carried out with the L-band and polarization VH. The results generated are promising insofar as the mapping of mangroves is concerned with a fast treatment time and acceptable precision of the results.

mangroveMadagascarmappingremote sensingSPOT-XSSIR-C radar

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© Kluwer Academic Publishers 1999