The Spatial Web Portal (SWP) is devoted to the creation of a web-based gateway for the purpose of discovering, aggregating, managing, and presenting geospatial information resources. The SWP is currently in its early beta version, which supports search for spatial resources in the forms of data components and web-based services. It supports visualization of web map service (WMS). The concept of spatial is systematically and purposefully integrated into the system¡¯s search procedure and the visualization functions. We bring the factor of physical locations of service providers into consideration when users select spatial resource providers. Therefore, the design of the graphic user interface (GUI) intentionally maximizes the use of map in all operations.

The Main Interface

The Main Interface with All Child Windows

Spatial Web Portal Operation Example

Next section briefly describes the procedure from search to service visualization.

¡€ The home page shows a world map. Click on ¡°Search¡± bring up the search window.

¡€ Keywords and Service Type are two criteria used to search for resources. If any resource¡¯s metadata contains the selected keywords in its metadata will be returned as a result.  The default Service Type is WMS. Clicking on the search icon next to the Advanced will send the search request to server; at the same time activating the result window.

¡€ All found resources¡¯ titles are listed in the result window. The list is divided into pages, which contain 10 titles per page. You can go to a page directly by typing in a page number in the input window and clicking on ¡°Goto Page¡±. The geographic locations of the resource providers are indicated on the base map.

¡€ Clicking on a title will activate the Details window, which contains detailed information about a resource.  From here on out we will assume the resource type is WMS. Basic information about a service includes a title, link to the service, shortened abstract, keywords, resource type, date, and date type. A WMS may consist of several layers. Clicking on the ¡°Layers¡± button will expand the layer tree.

¡€ All layers in a service are listed in the layer tab. Selecting and clicking on a layer name will active the historical performance tab and display the performance chart of the selected layer. Click on the ¡°+¡± button will add the layer to the layer control window.

¡€ In the Details window, clicking on the History button will bring up the performance tab which displays either the service (default) or layers¡¯ performance evaluation information.

¡€ Layers from different services can be added to the Layer Control window for visualization. Clicking on the check box will add the layer to the base map. The trashcan icon will delete the layer from the layer control window and base map. The arrow icons will change the sequence of layers. Clicking on the radio button set the layer controllable.


Spatial Web Portal Q&A

¡€ How can I manipulate pop-up windows?

      You can drag windows to any position of the browser window. All windows can be closed. Results and Details window support minimization and expansion. Because windows are activated by operations, try keeping all windows and using minimization to provide more map view space.

¡€ Can I search for different types of resources other than WMS?

      You can search for web feature service (WFS), web coverage service (WCS), and data components that include raw spatial data and data hosted by other portals. In the search window select service type from the Service Type option.

¡€ Can I search for keywords located in the title and abstract?

      In Search window click on arrow icon before Advanced Search expands the search window. You can search keywords contained only in Title and Abstract.

¡€ Can I do a search based on spatial criteria?

          In the Search window clicking on the arrow icon next to ¡°Advanced Search¡± will expand the search window. You can define the geographic location by latitude and longitude. Options like: ¡°overlaps¡±, ¡°enclose¡±, and ¡°is¡±, define relationships between search results and geographic location.