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Map Elevaton way off and too low

When I look at the elevation page or hover over the map I get approximately  minus -90 feet at the home point. 
Normally the home point is zero or a positive number. 
I use this to measure hight of trees and its not going to work for me if its way off like that. 
Is there a way to adjust that?
Do we have choices between elevation over the ground and sea level for this future?
If the home point was zero it would be best. 
Please advise me what went wrong and help fix this. 
Paul Werner

Official comment


We are sorry to hear you are not happy with your results. It looks like you did not include a Ground Reference image (image take at the takeoff location) with your dataset. 

You can read more about those here:

The good news is that you can fix without having to process it again using GCPs. These do not need to be surveyed. If you are just looking to change the elevation of the map the best thing to do would be select 5-6 locations throughout the map and right click on them to get the coordinates. Then get the real elevations from Google Earth or something like that. Then follow the process described here:

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