CRS Issues

[tmixon]

I am having issues with the horizontal and vertical reference systems along with the Geoid #. The project I have been shooting has been in Monroe county Georgia. In the past I have been using:
Horizontal = WGS 84 - EPSG: 4326
Vertical = EGM 96 - EPSG: 5773
Geoid = 96
However, these are not the specific CRS for my location, which is strange because is always puts my GCPs right at the site I mapped.
When I enter what Pix4DMatic says is correct for my area:
Horizontal = NAD83/Georgia West - EPSG: 26967
Vertical = NAVD88 Height (ftUS) - EPSG: 6360
Geoid = 18
It places my GCPs all the way at the coast in Louisiana.

Any help with this would be greatly appreciated.

[Mike_K]

Hi tmixon,

When looking at your Tie points table (your second screenshot), the coordinates appear to be in longitude/latitude which is consistent with WGS84. What you need to do is change the GCP coordinate system to WGS84. If you keep in stateplane (NAD83/Georgia West) then it will put the GCPs in the wrong place.

[tmixon]

If I change the CRS format to X, Y, Z would that work?

[Mike_K]

No. You need to change the CRS to WGS84. This is the only way.

[tmixon]

Ok. So is that the correct horizontal CRS for my area?

[Mike_K]

WGS84 is a global geographic coordinate system. Yes, it will work for your area.

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