Geo-Information Approach to Rainfall Mapping in Zambia
Rainfall over Zambia has been mapped, using Geographical Information Approach. The specific objectives of the study are to: (a) digitize the boundaries of the four ecological zones of Zambia; (b) determine the spatial variability of rainfall between ecological zones; (c) analyse the 2006/7 seasonal rainfall for Zambia graphically. The zones start receiving precipitation at varying times of the year with varying length of the rainy season and amount under the effect of the Inter tropical Convergence Zone and other accompanying air masses. Rainfall generally reduces from north to south. Monthly and seasonal rainfall data has been used to determine its spatial variability between ecological zones by ingesting it into a Geographical Information System to produce isopleths that indicate both similarity and variability across zones. The correlation of rainfall stations to the ecological zones has been assessed by considering the seasonal rainfall against the established zonal means. The effect of the ITCZ has been tracked using trend lines plotted on graphs. There are indications that the existing classification of the ecological zones of Zambia overlooked the effect of other factors that cause variation in rainfall in the sub-region. These factors include the North Easterly Trade, South Easterly Trade, and South Westerly Trade winds on the Northern, Eastern and Western provinces respectively.
Digitize ecological zones ENSO GIS ITCZ ITD isohyets and Rainfall
Elijah Miyemba
Zambia Meteorological Dept Box 30200 LUSAKA
国际会议
北京国际地理信息系统学术讨论会第七届会议（7th International Workshop Geographical Information System
北京
英文
241-267
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）