Luca Fallati Università degli Studi di Milano-Bicocca: MaRHE Marine Research and High Educational Centre
Land Use Changes (LUC) in developing countries are: - faster and widespread; - often not surveyed for lack of data and monitoring programs; In tropical coastal regions LUC can be a threat for the fragile marine ecosystem of the coral reef
Introduction Study Area Methodology & Results Web GIS application Conclusions Republic of Maldives Small Island Developing States Increase of the LUC in the last decades due to: - Population growth - Tourism growth All the LUC happened without monitoring programs. There were no Land Use national map and no LUC data.
National Area: 859,000 Km 2 Only 1% is land with an elevation of 1 m above the sea level 1190 islands: - 880 uninhabited - 200 inhabited - 110 resort
The islands types are easily distinguishable using Remote Sensing Data Uninhabited Inhabited Resort
The study was divided in 4 steps 1 STEP: - Choice of appropriate Remote Sensing Data; - Creation of a Land Use Classification; - Images classification; 2 STEP: - Fieldwork, collection of Ground Control Points; 3 STEP: - Post-Classification Comparison to detect LUC; 4 STEP: - Realization of a Web GIS application;
ESRI Basemap: World Imagery Free using ArcGIS Coverage 80% of the Maldivian islands High-resolution DigitalGlobe Images WV1, WV2 Metadata-enable
Land Use classes Hierarchical Classification: LEVEL I 1. URBAN OR BUILD UP LAND 2. AGRICULTURAL LAND 3. HERBACEUS UP-LAND 4. SHRUBLAND 5. FOREST LAND 6. BARREN LAND 7. WETLAND 8. INFRASTRUCTURE 9. CLOUD
Visual interpretation and manual digitation
Visual interpretation and manual digitation
Visual interpretation and manual digitation
Visual interpretation and manual digitation
Fieldwork: 25 October to 10 November 2013 Faafu Atoll, Magoodhoo island
Geographic accuracy Thematic accuracy
Contingency Table Overall Accuracy of the Land Use Map: 85%
Land Use Change detection Google Earth Images: Images only after 2002 Coverage not uniform Post Classification Comparison: IDRISI 17.0 Selva Edition, Clark Labs Land Change Modeler application
Web GIS application Free access ArcGIS Online Allows to create interactive web maps and apps shareable with anyone No need to be a programmer Bicocca University Account Web map and application linked to MaRHE website WebGIS application for mobile devices
Web Map linked to MaRHE website http://www.marhe.unimib.it
Web application linked to MaRHE website
Web Application linked to MaRHE website
WebGIS application for mobile devices
WebGIS application for mobile devices
WebGIS application for mobile devices
Conclusions High accuracy of the Land Use map realized Repeatability of the methodology for similar geographic situation Land Use Change maps are useful to understand the driving forces and the impacts of the changes WebGiS application, using ArcGIS Online, is easy to realize and to share with anyone
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