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Comparison of Strengths and Weaknesses of NDVI and Landscape-Ecological Mapping Techniques for Developing an Integrated Land Use Mapping Approach: A case study of the Mekong delta, Vietnam

Ali, Amjad (2009) Comparison of Strengths and Weaknesses of NDVI and Landscape-Ecological Mapping Techniques for Developing an Integrated Land Use Mapping Approach: A case study of the Mekong delta, Vietnam.

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Abstract:Land use mapping is important for the monitoring and planning of agricultural resources at local, regional and continental levels. The research objective of this study was to identify the comparative strengths and weaknesses of the NDVI versus Landscape-Ecological land use mapping techniques to develop an Integrated Approach. Both techniques were applied separately and identified their strengths and weaknesses. Next, both methods were combined in an Integrated Approach. The NDVI and the Landscape-Ecological Approach used existing methods with available remote sensing and other ancillary data to map agricultural land use systems of the Mekong delta Vietnam. The map produced by NDVI Approach showed 92% and 88% correlation with reported crop statistics, in two and three rice land use systems, with R2 of 74% and 76% respectively. The Landscape-Ecological Map was also significantly correlated with crops statistics in two rice crops (65%) and three rice crops land use systems (62%) with 64% and 63% explained variability. Keeping in view the strengths and weaknesses, the NDVI Approach was found more accurate, cheap, efficient and useful for agricultural land use mapping in tropical environment than Landscape-Ecological Approach. Regarding Integrated approach, there was significant positive association (χ2 = 57.78, d.f. = 1, N = 106, p < 0.01) between land use systems of both the NDVI Map and the Landscape-Ecological Map. Association between flooding regimes and geomorphology was although significant (χ2 = 64.54, d.f. = 12, N = 507, p < 0.01) but no strong trends emerged between the classes. Therefore the results of the integrated approach were less clear and complex, hence less useful for improvement in interpretation of agricultural land use systems. Finally geomorphology and soil information were added as additional legends to the NDVI map, because the NDVI Map proved more informative and accurate by explaining 10% more variability than Landscape-Ecological Map. The approach followed in this study can play a key role in characterizing agricultural land use systems and landscape of the area but require further studies to be proved effective.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
Link to this item:https://purl.utwente.nl/essays/93054
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