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GCP with CRS and elevations in feet results in tilted dem #1932

@baswein

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@baswein

We are using a GCP point file based on a MA State Plane (ft) projection. This has x,y,z values in ft.
We noticed that this resulted in a tilted ground and that the GCP location elevations did not match the elevations originally input.
Digging into it we noticed that webODM converts the GCP file to UTM 18N and in the process converts the x,y to meters but does not convert the z.
This is understandable as this is typical of GIS processes that do not attempt to convert elevations.
Thanks for all of your work on this great software. A warning that elevations need to be in meters would help or a way to tell WebODM what the units are so it can do the appropriate conversion.
Converting the Z to meters completely fixed the issue.

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