Maps featured here are constructed by overlaying map images provided by Web Map Services distributed throughout the World Wide Web. These map layers are listed in the NBII map catalog.
By selecting 'Search Catalog' under the 'Layers' tab of each map portlet, users may search the NBII map catalog to add additional map layers.
Map layering functionality is enabled by the Open Geospatial Consortium (OGC) specifications for Web Map Service (WMS) and the NBII Geospatial Interoperability Framework.
Additionally, users may embed maps from these map services in a web page or pull them directly into any computer-mapping Geographic Information System (GIS) applications supporting OGC specifications.
For detailed explanations of available mapping features, an online tutorial is available.
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