Google Earth, DEM's and elevations
We have two recent jobs that need elevation information and began by looking at Google elevations for planning, which I’m told is generated by the public available DEM’s. I was also informed these were generated by using quad sheet info. One of the projects was an elevation cert in a Zone A which needs a BFE. For that one the Google elevations ended up being 5 feet low for the house, which was a nice surprise, and Google had the river quite a bit west of where it is, although it may have moved since the DEM’s were generated.
The other one was a Dam project, we just did some preliminary cross sections and they were flatter than the dam and this time over 5′ off vertically.
Is it true that the DEM info is what Google uses for elevations and is that data taken from quad sheets?
The elevation cert is located on a 20′ contour quad and the Dam is located on a 40′ contour quad.
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