Google has released Google Earth 5.0 with 3D Ocean view and Mars mode. The ocean imagery are now 3D terrain. According to Google Earth blog
Move your mouse over the ocean and you’ll see below sea level elevations (negative numbers). But, the real surprise is when you first start flying towards the ocean and tilt your view. You now see an ocean surface! And, if your graphics card is new enough, you see wave motion on the surface.
The real pleasure comes when you fly under sea surface. You can both see the 3D bathymetry and see the surface above you for a real submarine-like experience!
Under the Layer pane in the lower left you’ll see a new “Ocean” layer folder. The folder contains a number of interesting new layers including material from National Geographic, Cousteau Society, BBC, NOAA, and more. There are locations of shipwrecks, tracks for ocean expeditions, GPS tracks of sea animals, and lots of information about the ocean environment.
Regarding the MARS mode, Google Earth blog states
Mars mode is not obvious when you open Google Earth. After loading Google Earth you look for the little planet icon at the top center of the view. Click on it and you will see a menu. You now can switch between Earth, Sky, AND Mars.
Once you select this, Google Earth transforms itself in a view of Mars instead of Earth. This is NOT just an image overlay on top of Earth! Its a complete simulation of the planet Mars just like Google Earth.
Google shows satellite imagery just like with Google Earth of the martian surface. Not only that, but they have 3D terrain as well!
There are very high resolution satellite images from the HiRISE imaging system on the Mars Reconnaissance Observatory satellite. You’ll see strips of HiRISE imagery overlayed in Google Mars. These images are just as high resolution as those you often find in Google Earth.
Open up the Mars Gallery->Rovers and Landers. Then double-click on MER Opportunity Rover layer folder. This will fly you to the place where the robotic explorer known as “Opportunity” moved across Mars. You can see its track, and as you zoom in you can see where it went.
You can download Google Earth 5.0 from here.
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