During the history of the Earth, sea levels have varied dramatically from
present conditions. During the peak of the last ice age 18,000-20,000 years
ago, sea level is estimated to have been about 120 meters (400 feet) lower
than it is now. If the vast ice sheets covering Greenland and Antarctica were
to melt completely, sea level would rise approximately 80 meters (260 feet) higher
than the current value.
Today's concerns about rising carbon dioxide concentrations in the atmosphere
and the resulting warming of the world are tied closely to rises in the height
of the oceans. In the past, higher atmospheric carbon dioxide levels correlated
to elevated global temperatures. Temperature changes of only a few degrees have
resulted in dramatic expansion and shrinkage of polar ice and glaciers, leading
to pronounced sea level changes.
for World Wind allows you to
explore the range of sea levels from distant prehistory to potential future scenarios. It is a
greatly expanded version of the popular free add-on. It contains many added new features, including higher resolution,
more maps, contours, flood zones and at-risk cities.
includes almost 3 GB of shaded relief maps of sea levels
at 10 meter intervals from 80 meters above to 120 meters below the current position
(1). These maps are based on the best available global
bathymetry datasets and all have a maximum resolution of approximately 2 km (1.25 miles, or
1 arc min). Elevations from -11,000 to 9,000 meters (-35,000 to 30,000 feet) are displayed.
also displays contour lines of all the sea levels to match the relief maps
at 10 meter intervals from 80 meters above to 120 meters below the current position (2).
The contours may be combined with the relief maps and other layers or overlayed on existing World Wind
also provides maps of coastal flood zones for land areas
5 meters and 10 meters above present-day sea level. These masks facilitate the identification of
locations that are at greatest risk of inundation by rising oceans and are susceptible to storm
surges, flooding and tidal effects.
includes labels and a variety of icons for low-lying and
coastal cities. Over half of the world's cities with one million or more residents lie less than
80 meters above sea level. The low-lying city component contains the geographic locations and
brief descriptions of these cities. They may be displayed as names, icons or flags.
A simple, high resolution political map and a set of vector-based international borders are also
included for ease of use and to expand the map making options available. layers may be combined with the default World Wind layers,
plugins and other compatible features as desired.
||NASA World Wind v1.3.5 or Later
||2.9 GB Hard Drive Space