I did a contour map of the area containing the MSL landing site and Glenelg, the first science objective, using Google Mars. The distance between neighboring lines is an indication of the direction and how steep the slope is at a point. The elevations for the contour lines range from -4480m farthest out from the MSL position to -4430m near the little peak. It's not what one would expect looking at the shading on the image of the surface. The map was done manually using the ruler path tool. Google Earth might look into adding a contour mapping tool. It could be useful for planning traverses to take advantage of the terrain.