How can I smooth the transition between surveys with different elevation datums?

GrantatCloudscape

I have adjusted the elevation for one survey so the datums match.

Why does the profile not reflect the change in elevation?

Now I want to get rid of the jagged edge where the current survey overlaps the wider original survey.

I created a polygon to trim the current surface by, and it looked good, until the original surface was displayed again.

Then the cropping appears undone.

I also tried to crop the current surface, export a TIF, then use the same boundary to crop a hole in the original surface, bring the current back in, confirming the elevation adjustment was still applied under Options, but then just ended up with more vertical jaggedness at the join.

It did appear the elevation adjustment was applied in the 3D view.

Is there a solution to this workflow that will give me an apparent monolithic surface?

I want to export a terrain file without the steps and spikes. I expected cropping to help with that.

Looking forward to some help with this. Cheers.

yianni

Regarding the profile not reflecting the change in elevation.

I have noticed that a blanket reseting of the Z value does not work along all the area where 2x surveys meet.

Have you tried relaying the order of the surveys? so you go with the one with the smoother values on the edge?

The other option could be to crop say a 20m wide strip along the edge of the survey, load it onto excel and play around with the extreme bathymetry values (smooth them in excel) and then load it back into GM.

GrantatCloudscape

Thanks for your suggestion, Yianni.

What I did to get a result was create a boundary inside the perimeter of the smaller surface to crop back to a clean edge. Export the result as a tif.

Loaded the wider area surface and used the same crop boundary line to exclude the area I wanted to update with the drone data exported above. Export the result as a tif.

Now import both tifs into a new Global Mapper instance. Clean contiguous surface - no spikes. Export to save as a single integrated surface.

I don't know why saving in GM doesn't seem to save cropping changes, and seems to only be able to persist one crop action at a time. cropping a second area with another boundary seems to undo the first crop. It would be great if it could support multiple crop actions and save all the changes.