Operational Significant Event Imagery Interactive Map Viewer What is an Interactive Map Viewer? Use the Operational Significant Event Imagery (OSEI) viewer to see "where on earth" images are available. Image locations are displayed in separate layers on the map, e.g. volcanoes, floods, storms, etc. Circles are displayed at center points of available OSEI images. The relative size of the circles shows the relative size of the images (larger circles = larger images). Upon 'zooming in' on the map (using the Zoom Tool ), the approximate area covered by an image is shown as a rectangle on the map. To view an image, click on the identify tool ( ) in the viewer toolbar, click on an area of interest, and select the link to the image in the table displayed at the bottom of the map.

What do we mean by interactive map viewers?

NGDC's interactive map viewers provide visual display of one or more data layers, often with links to download the underlying data. Users can view layers containing different types of data, adding reference information such as continents, rivers, and political boundaries if desired. Zoom, pan, identify, search, find, and hyperlink capabilities are also available. See the toolbar help for hints on using these tools.

These maps may contain large graphics and may take a long time to load, especially over a slow connection. They also require current browsers with javascript enabled. Macintosh users, especially should make sure that they have at least Netscape 6 or IE 5. PC users should have either Netscape or IE 4 or higher.