Map Navigation
Navigation Buttons
[Expand -] View more of the map, at a reduced size.
[Expand +] View less of the map, at an expanded size.
[Full view] View the entire map.
[Rotate -] Shift the current view in the counterclockwise direction.
[Rotate +] Shift the current view in the clockwise direction.
[View as PNG] View the map in PNG (Portable Network Graphics) format. PNG raster images can be viewed in most current browsers.
[View as SVG] View the map in SVG (Scalable Vector Graphics) format. SVG is an XML grammar for defining vector-based 2D graphics. SVG images can be viewed in most current web browsers using the Adobe SVG plugin.
Note: The file size of the current view in SVG and PNG format is given in the lower right of the map window.
Navigation Using Tick Marks
A region of interest can be expanded by clicking on the nearest tick mark.
Label Hyperlinks
Some feature labels may be linked to other resources. To access a linked resource, click on the feature label.
Label Mouseover
Additional information may be viewed for some features by pointing to the feature label.
Contact: Paul Stothard
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