USING GEOGRAPHICAL INFORMATION SYSTEM FOR DISTRIBUTION OF POLLUTANT EMISSIONS WITHIN AN URBAN AIRSHED MODEL GRID SYSTEM

摘要

Photochemical modeling studies are undertaken for an area to find out the best means of controlling high ozone levels there. As a part of the photochemical modeling process, the entire area of study needs to be divided into small grids of equal sizes and total emissions of ozone precursors (NOx and VOC) from that area needs to be specified at the center of these grids. Previous studies by Brandmeyer et. al. (2000) and Kim et. al. (2000) have used GIS techniques for emissions allocation into different grids encompassing the study area. Currently a modejing study is being undertaken for the Corpus Christ! urban airshed. This paper basically reports on the method, which was used for allocating emissions of ozone precursors from area and non-road sources into grid cells of the two counties of Nueces and San Patricio comprising the urban airshed of Corpus Christi using the geographical information system (GIS) techniques. Two GIS software namely, Arcview and Arcinfo were used in this study for allocation of these emissions and their subsequent visualization (ESRI, 1997a & 1997b).