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Abstract
A Comparative Analysis of Vegetation Indices:
- A study on Mumbai city, India.
Michelle Viswanathan
Department of Geology,
Email: Michelle_v87@yahoo.com
Hrishikesh Samant
St. Xavier’s College, Mumbai
In this study an attempt was made to determine the areas under vegetation in the city of Mumbai. The different vegetation indices (VI) RATIO, NDVI, PVI1, PVI3, WDVI were compared. The VI images were run through a Principal Component Analysis. The data used for the study was IRS 1C LISS 3 remote sensing data from December 2003. It was found that Sanjay Gandhi National Park shows high vegetation in all the indices. From the image histograms, NDVI was found to have a higher contrast. From the statistical data obtained after Principal Component Analysis, it was found that PVI1 has a high correlation with Component 1. PVI3 had a high correlation with Component 2. Two areas of Mumbai were studied in the VI images, IIT Powai Gymkhana and Kanheri caves. The VI values for dense vegetation cover and rock/soil and grass in these two areas were compared. It was found that NDVI and RATIO show a higher separation in values.
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