DCIP2D:
FILE: topo.dat

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This file defines the surface topography along the traverse of the DC/IP experiment by specifying the elevations of selected points. The finite difference mesh defined in fdmesh.dat is linked to the topography by specifying the elevation ELEV0 of the top of the mesh at z = 0, i.e., ELEV0 is assumed to be the highest point on the topographic surface. If there are points higher than ELEV0 on the surface, they are set to ELEV0. By convention, the elevation is positive up. It can be given in relative values. The file topo.dat must cover the core portion of the mesh where electrodes are placed. The coverage should ideally extend to both ends of the mesh, otherwise the remaining portion towards the ends will be assumed to have the same surface elevation as the respective end points given in topo.dat. Otherwise, the program will stop. The topographic surface is discretized onto the mesh using the elevations at the horizontal nodes that are obtained by linear interpolation from this file. The file structure of topo.dat is as follows:

N   ELEV0
X1  ELEV1
X2  ELEV2
:
XN  ELEVN

N

number of points defining the topographic profile.

ELEV0

the elevation of the top of the mesh defined in fdmesh.dat

Xn

horizontal location of the nth point on the profile.

ELEVn

elevation of the nth point on the profile.