The World Wide Web era has brought about the rapid growth of geographical data, including data from satellite images, data obtained from ground and ocean sensors, data collected by GPS, and geospatial data spontaneously contributed by users through the Internet. People’s sharing of geographical information is also growing.(Goodchild, Fu,and Rich, 2007). Geographical information portals can help people discover, access and use geospatial information more easily and are an important part of geographical information sharing. Many countries attach great importance to the construction of geographical information portals as an important part of the national spatial data infrastructure (SDI).

The introduction of geographic information portal website in this book has important significance, on the one hand, because it is a WebGIS application; on the other hand, because it can provide data and services for WebGIS application development, and promote the development of WebGIS.