Ashraf Dewan

Spatial and temporal analysis of a 17-year lightning climatology over Bangladesh with LIS data

Using NASA’s TRMM Lightning Imaging Sensor (LIS) data from 1998 to 2014, this paper presents a 17-year lightning climatology of Bangladesh, at 0.5° × 0.5° spatial resolution. Diurnal, seasonal, monthly and annual variations in the occurrence of lightning flashes were explored. The diurnal regime of lightning is dominated by afternoon/evening events. Overall, peak lightning activity occurs in.. Read More


Assessing channel changes of the Ganges-Padma River system in Bangladesh using Landsat and hydrological data

The Ganga/Ganges1 is an important river system in South Asia which supports the life and livelihoods of millions of people both in India and Bangladesh. The system has a number of names throughout its length. Below its confluence with the Brahmaputra at Aricha it is known as the Padma, which in turn merges with the.. Read More

Floods in a Megacity: Geospatial Techniques in Assessing Hazards, Risk and Vulnerability

Flooding is one of the most devastating natural hazards in the world. Available records suggest that both flood frequency and severity are on the rise and this is likely to worsen in the context of climate change. As population, infrastructure and poverty grow rapidly in developing countries, particularly in urban agglomerations of 10 million people.. Read More