The GREAT-ER (Geo-referenced Regional Exposure Assessment Tool for European Rivers) project team has developed and validated an accurate aquatic chemical exposure prediction tool for use within environmental risk assessment schemes. The software system GREAT-ER 1.0 calculates the distribution of predicted environmental concentrations (PECs) of consumer chemicals in surface waters, for individua...

The last few years have witnessed an enormous study in the area of integrated hydrological modeling with GIS application. In this research, attempt was made to critically look at the application of HEC-GeoHMS which is an extension of ArcView in HEC-HMS; an HEC package which is a new generation of software being developed for rainfall-runoff simulation. The main role of HEC-GeoHMS is to formulat...

Simulations of total runoff and fine sediment yield in Goodwin Creek watershed, which covers 21Ð3 km2 in Mississippi, were carried out using a hydrological model-GIS system. The system includes the recently released Soil and Water Assessment Tool (SWAT) model version 2000 and AVSWAT version 1Ð0, the supporting interface with ArcView GIS. Among the required GIS input, some are commonly available...

Landscape Ecology is a new field of the macro-ecological research. Study on the Landscape pattern change is a research hotspot of the landscape ecology at present. The main research methods in this paper are stated as follow: using remote sensing data to get the basic landscape pattern data of Jinta Oasis in 1990 and 2000; calculating four landscape indexes by utilizing the statistics function ...

Introduction As the extent of forest fragmentation in­ creases worldwide, forest edges are becom­ ing an increasingly important feature in the landscape matrix (Harper et al. 2005). At forest edges, acidifying (N+S) and nitrogen (N) throughfall deposition are increased up to four times compared to the forest interior, and this edge effect decreases exponentially with increasing distance from th...

Several Geographic Information Systems (GIS)-based Karst Feature Databases (KFDs) have been established in many karst regions and countries (Cooper et al., 2001; Florea et al., 2002; Lei et al., 2001). However, the absence of comprehensive database models and standard metadata impeded the data compatibility and management (Gao et al., 2005a). A KFD has been developed in Minnesota in the past fe...

This paper reviews a recent RedfishGroup project for the City of Santa Fe Fire and Police Department integrating wildfire simulation and agent-based modeling of traffic dynamics. Visualizations of the evacuation dynamics were used to communicate with citizens dangers faced during evacuations and to explore when shelter-in-place is a reasonable alternative to evacuation. Additional uses of the m...

This paper reports on the development of prototype software designed for exploratory visualization of geographically referenced health statistics. The software prototype provides a number of interactive methods for exploring relationships between risk factors and mortality rates and how they are distributed in space. The use of geographically referenced mortality data to detect disease "hot spo...

Watershed scale hydrologic simulation models HSPF (Hydrologic Simulation Program – FORTRAN) and SWAT (Soil and Water Assessment Tool) were used to model the hydrology of the 2150 square mile Iroquois River watershed (IRW) located in the east central Illinois. Both models are part of the BASINS modeling system that facilitates preand post-processing of data, as well as data input to the models u...