Database Server Models for WMS and WFS Geographic Web Services - Geographical Information Systems: Trends and Technologies - page 142

CHAPTER 6
Database Server Models for
WMS and WFS Geographic
Web Services
Nissrine Souissi a, * and Michel Mainguenaud b
Introduction
Geographical Information Systems (GIS) have improved their services
in the past years, mainly due to two factors: the overwhelming spread
of Internet (e.g., speed, security, data availability) and the use of web
technologies. Due to these evolutions, new GIS services have appeared.
They provide the diffusion (e.g., interactive maps), the analysis or updates
of geo-localized data.
These systems produce and manipulate huge amounts of geographical
data (e.g., Google Earth) which is stored all over the world in various
places using various formats. These formats may be closed (i.e., proprietary
dependent) or opened, normalized or not. Consequently, analysis and/
or decision-making may be difficult or time-consuming due to this
heterogeneity of formats. To avoid these drawbacks and in order to
facilitate accesses and usage of these data, the Open Geospatial Consortium
(OGC) defi ned some propositions designed to ease the interoperability of
cartographical servers thanks to interfaces defi ned in technical specifi cations
a Ecole Nationale de l'Industrie Minérale (ENIM)-Dept. Informatique, Avenue Hadj Ahmed
Cherkaoui, B.P. 753, Agdal-10000 Rabat-MAROC.
Email: [e-mail]
b Institut National des Sciences Appliquées de Rouen-LITIS EA4108, 685 Avenue de
l'Université, B.P. 08, F76801 Saint-Etienne du Rouvray-FRANCE.