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Land use and land cover (LULC) of the Republic of the Maldives: first national map and LULC change analysis using remote-sensing data

Abstract

The Maldives islands in recent decades have experienced dramatic land-use change. Uninhabited islands were turned into new resort islands; evergreen tropical forests were cut, to be replaced by fields and new built-up areas. All these changes happened without a proper monitoring and urban planning strategy from the Maldivian government due to the lack of national land-use and land-cover (LULC) data. This study aimed to realize the first land-use map of the entire Maldives archipelago and to detect land-use and land-cover change (LULCC) using high-resolution satellite images and socioeconomic data. Due to the peculiar geographic and environmental features of the archipelago, the land-use map was obtained by visual interpretation and manual digitization of land-use patches. The images used, dated 2011, were obtained from Digital Globe’s WorldView 1 and WorldView 2 satellites. Nine land-use classes and 18 subclasses were identified and mapped. During a field survey, ground control points were collected to test the geographic and thematic accuracy of the land-use map. The final product’s overall accuracy was 85%. Once the accuracy of the map had been checked, LULCC maps were created using images from the early 2000s derived from Google Earth historical imagery. Post-classification comparison of the classified maps showed that growth of built-up and agricultural areas resulted in decreases in forest land and shrubland. The LULCC maps also revealed an increase in land reclamation inside lagoons near inhabited islands, resulting in environmental impacts on fragile reef habitat. The LULC map of the Republic of the Maldives produced in this study can be used by government authorities to make sustainable land-use planning decisions and to provide better management of land use and land cover.

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Acknowledgements

For fieldwork in the Maldives, the authors would like to acknowledge the Ministry of Fisheries and Agricultures and the community of Maghoodhoo, Faafu Atoll. The authors also wish to thank Paola Fiano and Stefano Masier for the support provided in the realization of the LULC map.

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Correspondence to Luca Fallati.

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Fallati, L., Savini, A., Sterlacchini, S. et al. Land use and land cover (LULC) of the Republic of the Maldives: first national map and LULC change analysis using remote-sensing data. Environ Monit Assess 189, 417 (2017). https://doi.org/10.1007/s10661-017-6120-2

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Keywords

  • Republic of the Maldives
  • Land use and land cover (LULC)
  • Remote sensing
  • Change detection
  • Coral reefs