Abstract
The decline in vegetation cover of the cities is a serious issue around the globe. Karachi, as the largest city of Pakistan is experiencing the removal of vegetation at the cost of the construction of the builtup land. Karachi experiences semiarid climate thus availability of vegetation and water is quite dynamic. Soil moisture can be predicted by density of vegetation cover. Growth of Karachi in terms of population is very high so as high consumption of food, which is grown in the nearby pockets of Malir and Gadap valley. In Karachi Hydrometeorological hazard (Drought) is common hence, monitoring and mapping of Land resources is essential. This Study assesses the role of Geoinformatics techniques for monitoring spatio-periodic variation of surface vegetation in Karachi. Four satellite imagries of Landsat -7 TM were selected to perform various process. Through NDVI spatio-Temporal and seasonal distribution of vegetation dynamics were observed and tabulated for each Union council of Karachi using software ArcMap 10.1. Maps developed for the quick and comparative understanding. Use of remote sensing and GIS technology for the monitoring and evaluation of substantial spatio-temporal variations of land resources such as vegetation cover is ideal. Therefore, this study would be beneficial for environmentalist and planners.
