Regional-scale forest ecosystem models can provide insight into how forest hydrology and productivity differ in response to variations in climate and soil conditions. However, the databases necessary to define and validate these models are difficult to compile and utilize. The use of a Geographic Information System (GIS) can greatly simplify problems in database management. As an example of reg...

The study has shown the integration of SWAT with GIS and remote sensing tool are helpful analyze and evaluate spatiotemporal land use/cover dynamics. It has also shown that Arc SWAT is an effective tool in analyzing the impacts of land use/cover changes on stream flow in areas with limited readily available data. The study also revealed that Hydrologic simulation models are very essential way u...

Constructing the data model for public transportation by integrating the spatial and the non-spatial information, is the basis of reasonable plan and effective management of urban public transport. This paper presents a transit data model based on geographic information systems (GIS) technology, which utilizes arc-node networks, and manages the foundational bus data with point, link, polygon an...

Active volcanoes give significant threats to the populations that live in their proximity. The Three Sisters Volcanic region is one of 9 threatening volcanoes within the Cascades volcanic arc. Eruptions are probable which makes it essential to complete hazard, vulnerability, and risk assessments so that proper planning, education and mitigation procedures can be implemented prior to the threat ...

A Watershed Management Decision Support System (WAMADSS) is used to evaluate the economic and environmental consequences of alternative land use/management practices (LUMPs). WAMADSS consists of three components: (1) a GIS, (2) an economic model, and (3) two environmental simulation models. Specifically, ARC/INFO serves as the engine for integrating the Cost and Return Estimator (CARE) program,...

The Arc Hydro ground water data model is a geographic data model for representing spatial and temporal ground water information within a geographic information system (GIS). The data model is a standardized representation of ground water systems within a spatial database that provides a public domain template for GIS users to store, document, and analyze commonly used spatial and temporal groun...

Traditional polygon-arc-node topology is standard in vector GIS, but it has its limitations. This is particularly evident at the digitizing stage, which often appears excessively complex and tedious, Other methods, however, are capable of maintaining some forms of topology “automatically”, and this paper is an overview of three approaches based on the Voronoi diagram (or the equivalent Delaunay...

The design and implementation of software for extracting information from GIS files to a format appropriate for use in a spatial modeling software environment is described. This has resulted in publicly available c/c++ language programs for extracting polygons as well as database information from ArcView shape files into the Matlab software environment. In addition, a set of publicly available ...

The progress of information technology (IT) and the need for global distribution of geospatial information and remotely sensed imagery create strong needs for web-based geographic information systems (GIS) and remote sensing facilities (Tsou and Buttenfield, 1998; 2002; Limp, 2001). This paper introduces a webbased remote sensing application that can provide advanced image comparison and proces...