DETERMINATION OF CONVERTION OF TEA LANDS IN KANDY DISTRICT USING DIFFERENT REMOTE SENSING INDICES

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Year:
2016
Type of Publication:
In Proceedings
Keywords:
Vegetation index, Marginal tea lands, Change detection, Land suitability
Authors:
Fernando, Tamasha; Gunawardena, Ajith
Abstract:
Commercial tea plantation was started in 1867 in Kandy extending 19 acres in Sri Lanka, at the Loolecondra Estate. Eventually Sri Lankan tea become the best productive in the world and the crop expand in Central Province, Sabaragamuwa, Uva and ultimately expanded in low country. Improper management, finally cause reduction of the yield and most of the tea land become unproductive especially in central hills. At present out of total tea lands around 40 -50% has been marginalized in Kandy District. This will need actions to prevent the land from the irreversible impact of unproductiveness. This study has been conducted to identify the conversion of existing tea lands in to different land uses in Kandy District within 15 years period using Landsat 8 OLI and TIRS (2015) image with 1:50,000 landuse baseline data. Different reflectance and absorption patterns of multispectral bands over land uses are considered in this analysis. Normalised Difference Vegetation Index (NDVI), Soil Adjusted Vegetation Index (SAVI), Normalised Difference Built-Up Index (NDBI), Normalised Difference Bareness Index (NDBaI), Enhanced Built-Up and Bareness Index (EBBI) and Urban Index (UI) are applied to distinguish the changes in tea lands. Sample locations (28) collected in Google images have been used for validation purpose. The results show, UI is more productive in detection of changes of tea lands with Overall accuracy of 76% and Kappa accuracy of 0.47. Out of total tea lands in the Kandy district (43,478ha) it has been identified 8522ha as bare lands, built-ups and other vegetation types. The identified areas can be utilized for further developments purposes and conservation by considering the slope as a factor.
Full text: Ab 0158.pdf [Bibtex]
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