Official comment

You can still make the 3D volume measurements in the browser without those files. The data needed for making those measurements is kept as long as the map is active.
You can still make the 3D volume measurements in the browser without those files. The data needed for making those measurements is kept as long as the map is active.
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Thank you for the fast response. There are 3D low-res public previews and base and elevations maps left but the 3D data appear to be 'no longer available'. That is why I thought that my Dropbox store would be helpful. Here are a couple shots from the project I am attempting to make a volumetric measurement.
Those file are gone forever. I just made volume measurements with your map and it worked fine. Use the polygon tool and say that you want the volume measurement when prompted.
Zane,
It turns out it was my error completely. I used 'polyline' not 'polygon'. Worked perfectly with polygon. Sorry to waste your time. The polyline was giving me linear measurement of the line. The polygon gave me the volume. Very good site, after trying many others, I like yours the best.
Carl