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**General / Re: HELP :compound coodinate system**

« **on:**March 05, 2020, 07:15:36 PM »

Hi again

We tried to create the conpound cordinate system. It seems to be right and it works, but we have a little difference.

In the past we worked with GPCS on the ground measured with survey GPS device (accuracy XY=0.01 and Z=0.02).

So that, with the new Phantom 4 RTK and the conpund coordinate system, we achieve a very good XY accuracy BUT in Z coordinate we had a difference betwen our GPS Z and the estimate Z in metashape.

This difference it can be abot 2 meters to 5. It is excatly the same difference for one chunk, I mean: we measure 3-4 GPCs in early works (just to check) and all of them had the same "offset".

We think that It can be because our conpound coordinate system.

Question: if I upload the Geoid (in spain REDNAP-egm08) and with EPSG25830 and EPSG 25831...would you please create this conpund coordinate system for us?

Thanks in advance.

We tried to create the conpound cordinate system. It seems to be right and it works, but we have a little difference.

In the past we worked with GPCS on the ground measured with survey GPS device (accuracy XY=0.01 and Z=0.02).

So that, with the new Phantom 4 RTK and the conpund coordinate system, we achieve a very good XY accuracy BUT in Z coordinate we had a difference betwen our GPS Z and the estimate Z in metashape.

This difference it can be abot 2 meters to 5. It is excatly the same difference for one chunk, I mean: we measure 3-4 GPCs in early works (just to check) and all of them had the same "offset".

We think that It can be because our conpound coordinate system.

Question: if I upload the Geoid (in spain REDNAP-egm08) and with EPSG25830 and EPSG 25831...would you please create this conpund coordinate system for us?

Thanks in advance.