Internet Map Server

Abstract: This work implements a Web-based Geographic Information System (Web GIS) for an existing oil spill monitoring and forecasting service, developed in the framework of the MARCOAST project. This is achieved by remotely presenting the results of the oil spill forecasting module via a dedicated Web GIS, which allows authenticated end users to view the simulation results in a geographical context. A number of Web GIS technologies for presentation of dissimilar types of semi-dynamic geographic data are applied and their respective capabilities for publishing and remote presentation of interactive geospatial information, such as oil spill spread animation overlaid on background data (terrain elevation data, satellite imagery, etc.), are described. More specifically, technologies like ESRI^(R) ArcIMS^(R) (Arc Internet Map Server) and Open Source GeoServer with OpenLayers client library are implemented. The capabilities of the system for visualization and mapping are illustrated by specific applications concerning the spreading scenarios of oil spills in two selected areas of the Aegean Sea, Greece. The presented Web GIS offers added value in the form of providing the end user with comprehensive and synthetic, both spatial and temporal, environmental information through a remotely customizable user-friendly graphical interface. In this context, its integration to a marine pollution monitoring and forecasting system could result in an enhanced pollution awareness and emergency management tool.

Abstract: A Web-based decision support or advisory tool that allows developers, planners, and other local government decision makers to utilize a high-resolution digital elevation model (DEM) and floodplain-related geographical information system (GIS) data layers in making floodplain management decisions is described. The tool was developed using data for a small subdivision in St. Charles County, Missouri, which is one of the fastest growing counties in the Midwest. A high-resolution DEM was generated using digitally scanned National Aerial Photograph Program (NAPP) photos in conjunction with highly accurate ground control from a rapid-static Global Positioning System (GPS) survey. Design and development of the Web-technology utilized ArcView GIS® and Internet Map Server, Java, JavaScript, HTML, and Avenue programming. This Web-based interface allows local users to interactively display and query different floodplain-related GIS layers. Important applications include determining whether a parcel is within or outside the current FEMA (Federal Emergency Management Agency) 100-year floodplain and determining the elevation of a particular point. This paper also discusses the limitations and future direction of the present prototype.