See also CourseNotes by Dr.Loke and Res2dinv圆4 / Res3dinv圆4 user manuals. More details are included in attached PDF. Demo version of RES2DINV and RES3DINV should be enough for the small amount of data typically collected with LandMapper. Run RES3DINV on the newly created file.txt file for collating lines into 3D file as described below dat files to import into RES2DINV (demo version should suffice). Conduct at least 3 parallel 2D lines surveys as described in LandMapper manual.The (XYZ) format used as input data for Voxler software to generate 3D visualize picture. dat files into 3D layout to run RES3DINV inversion and obtain 3D model of the subsurface. By RES2DINV Software, the raw data of electric resistivity was converted to (XYZ) file and saved as showing in Fig. The simplest layout combines three or more parallel 2D. However, for practical reasons (and certainly more so with manually switching instruments, such as LandMapper), most commercial 3-D surveys use a number of parallel 2-D survey lines with possibly some tie lines in a perpendicular direction.
Ideally, a 3-D survey should be carried out using a rectangular grid of electrodes with measurements in different directions (Loke and Barker 1996). Although conducting 2D and 3D surveys manually with LandMapper is tedious and time-consuming, some of our customers (after gaining proficiency in 2D Dipole-Dipole tomography) have asked us about 3D survey.
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