Estimation of the Vegetation Stress by Remote Sensing Techniques; A Case Study in HambantotaDS Division in Sri Lanka
GIS, Industrialization, NDVI, Stress,Urbanization
Industrialization and urbanization are two common processes in development. As a result of development, natural land cover and the environment can be change. Therefore due these changes, some sort of stress condition can be develop to the existing vegetation. GIS is an important tool which is used in vast range of applied sciences. NDVI is the one of a main parameter that can be used to estimate the vegetation health. After the civil war, Hambantota gets a rapid development compared to other areas in Sri Lanka. Principle objective of this study is to find out the changes in the vegetation stress with the time. Changes in the NDVI values were derived by using Landsat images from year 2010 and 2014 and Arc GIS 10.1 used as the image analysis software. According to the derived NDVI maps, study area was classified in to four three stress classes as low, moderately and highly stressed. Low stressed areas decrease from 19% while moderately stressed areas increased from their land extent by 196% in year 2014 compared to 2010. However highly stressed areas in year 2014 had been increased their land extent by 90% compared to 2010. As a result of industrialization and urbanization, stress level to the vegetation was increased with the time. More than half of the vegetation is still under low stress condition.