EarthFlood uses freely available elevation data from the National Geophysical Data Center's web server to render attractive, detailed maps of any part of the world.  It then allows you to specify the ocean level and view the resulting map.

Click on the thumbnails below to see screen shots.

    
On the top-left is North America at today's ocean level.
The top-right image shows sea level 2 meters above today's level.  Most of the coastlines are changed, and a large part of the Mississippi Delta is gone.  The changes are subtle in the image, but would not be to anyone living in coastal areas.
The bottom-left is North America with the ocean 25 meters above today's level.  Notice that Florida is almost totally submerged and the Central California Valley and Bay Area are submerged.

Features

• Extremely fast rendering.
• Interactive, graphical map selection interface.
• Animated flood from any arbitrary ocean level.
• Highest and lowest elevation markers.
• Three rendering modes: Shaded Relief, Color Gradient, and Topographical.
• Magnifier for zooming into a region (see top left screen shot).

EarthFloodEx.zip contains the program and one data file covering North America.
EarhtFlood.zip is just the program.

Download EarthFlood.zip - 219 KB
Download EarthFloodEx.zip - 555 KB

Here is a private build.  The user draws a track across the ground.  The track is drawn in red if the terrain elevation exceeds a given critical value, otherwise it is drawn in green.
Download GroundTest.exe - 593 kb - (self extractor)