With the development of the OpenGIS WFS (Web Feature Service) Specification by OGC (Open GIS Consortium), more
and more WFS servers appear on the internet offering geospatial information. However, general users have no
acquaintance with these servers, and the servers usually supply data encoding in GML (Geographic Mark Language)
which cannot be comprehended vividly. Therefore, in this paper, we propose a spatial information search and display
System on OpenGIS WFS. This system is capable of providing a WFS server list containing the data of the place that the
users requested, retrieving the capabilities of the service chosen by the users and displaying the service data in vector
graphics. The system architecture, working principles, and detailed function of each component are introduced. With this
system, a practice web search engine on OpenGIS WFS can be constructed on the foundational idea of the system.
The growth of the internet makes it non-trivial to search for the accuracy information efficiently. Topical crawler, which
is aiming at a certain area, attracts more and more intention now because it can help people to find out what they need.
Furthermore, with the OpenGIS WFS (Web Feature Service) Specification developed by OGC (Open GIS Consortium),
much more geospatial data providers adopt this protocol to publish their data on the internet. In this case, a crawler
which is aiming at the WFS servers can help people to find the geospatial data from WFS servers. In this paper, we
propose a prototype system of a WFS crawler based on the OpenGIS WFS Specification. The crawler architecture,
working principles, and detailed function of each component are introduced. This crawler is capable of discovering
WFS servers dynamically, saving and updating the service contents of the servers. The data collect by the crawler can
be supported to a geospatial data search engine as its data source.