Wrong coordinates in tutorial notebook

[mariosgeo]

Problem description

The tutorial for the tanked modeled ert, has wrong node coordinates, when it comes to the reference electrode and the calibration electrode.

You have defined the coordinates of the reference to be on te boundary conditions and when you refine the nodes, you add a node outside the domain (-0.501). Could you please fix this?

I think I have asked in the past, but it's not clear how you use the calibration node. Do you add some potential value somewhere?

[halbmy]

You are referring to https://www.pygimli.org/_examples_auto/3_ert/plot_modTank3d.html

The model goes from x=0...0.99, y=0...0.5 and z=-1...0 after:
plc = mt.createCube(size=[0.99, 0.5, 1.0], pos=[0.495, 0.25], boundaryMarker=1)

The reference (current) electrode (-999) is
plc.createNode([0.5, 0.5, -0.5], marker=-999)
at the side opposite to the electrode line.

The calibration node
plc.createNode([0.75, 0.25, 0.5], marker=-1000)
is inside.

The refinement electrodes obtains z=-0.501 but this is inside. Am I wrong?

[mariosgeo]

The box extends from Z=[-0.5 to +0.5].
I think this is because when you set the box,

plc = mt.createCube(size=[0.99, 0.5, 1.0], pos=[0.495, 0.25], boundaryMarker=1)

You pass the arguments as pos[x.y] and not pos[x,y,z]

[halbmy]

Yes, you're right. The pos vector should have a ,0 for clarity and the refinement node for the reference is outside. I guess this will mainly affect the accuracy in the vicinity of the reference. Can you check what happens if you move the node up and not down or the reference line to z=0?

[mariosgeo]

The forward solution changes slightly solution will slight change (I suppose it's more accurate).