MODELING OF SATELLITE DATA TO IDENTIFY THE SEASONAL PATTERNS AND TRENDS OF VEGETATION INDEX IN KATHMANDU VALLEY, NEPAL FROM 2000 TO 2015

Ira Sharma; Attachai Ueranantasun; Phattrawan Tongkumchum

doi:10.11113/jt.v80.11728

Authors

Ira Sharma Faculty of Science and Technology, Prince of Songkla University, Pattani Campus. 181 Charoenpradit Rd., Rusamilae, Muang Pattani, Pattani 94000
Attachai Ueranantasun Faculty of Science and Technology, Prince of Songkla University, Pattani Campus. 181 Charoenpradit Rd., Rusamilae, Muang Pattani, Pattani 94000 http://orcid.org/0000-0002-6078-7197
Phattrawan Tongkumchum Faculty of Science and Technology, Prince of Songkla University, Pattani Campus. 181 Charoenpradit Rd., Rusamilae, Muang Pattani, Pattani 94000

DOI:

https://doi.org/10.11113/jt.v80.11728

Keywords:

Satellite data, normalised difference vegetation index, cubic spline function, linear model, generalized estimating equations

Abstract

Normalised difference vegetation index (NDVI) data were analysed to identify the seasonal patterns and the time series trends of vegetation in Kathmandu. The data were managed in three steps: reordering, removal of unreliable values and validating. A cubic spline function was used to examine annual seasonal patterns that revealed regular seasonal peaks (day 225 to 280) and troughs (day 50 to 81) of vegetation and start of greening from April and of browning from November. Linear regression models were fitted to seasonally adjusted NDVI, which statistically showed 40.70% of the grid cellsÂ had a significant increase and 24.71% of it had decreasing trends. To adjust for autocorrelation, generalized estimating equations (GEE) were fitted to the data for whole area that showed, the overall vegetation has been significantly declining at a rate of -0.005 ÌŠC and -0.006 ÌŠC per decade for 2000-2004 and 2010-2015 respectively. The recent period of decline is alarming for a growing city like Kathmandu.

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Author Biography

Attachai Ueranantasun, Faculty of Science and Technology, Prince of Songkla University, Pattani Campus. 181 Charoenpradit Rd., Rusamilae, Muang Pattani, Pattani 94000

A lecturer at Department of Mathematics and Computer Science, Faculty of Science and Technology

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