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Table 1. Compare LandMapper ERM-01 and ERM-02

Table 1.  Compare LandMapper ERM-01 and ERM-02

Feature

LandMapper ERM-01

LandMapper ERM-02

Electrical Resistivity, Ohm m

YES

YES

Electrical Conductivity, Sm

Post-process

YES, direct readout

Natural Electrical Potential

NO

YES

Central-symmetric 4-electrode probes (Wenner, Schlumberger)

YES

YES

Universal 4-electrode probes (dipole-dipole, square, etc.)

NO

YES

Max depth (tested to, possibly more)

100 m

100 m

Measurements in the lab

YES

YES

Measurements in the soil pit

YES

YES

Stores 1000 data points for download to PC

YES

YES

Responds to commands from PC in interactive regime

NO

YES

 

The accuracy of electrical resistivity measurements with LandMapper was tested by Landviser, LLC and by USGS and USDA labs alongside with Sting (AGI, Inc.) and AE-72 (analog Russian standard resistivity meter for deep geophysical sounding). Difference between equipment had not exceeded 2% in the wide range of resistivities. Being essentially direct current contact resistivity meter with high internal impedance, LandMapper can measure ER in a wide range from 0.1 to 106 Ohm m (Table 2) with automatic adjustment to the range of apparent resistivity in the studied media. LandMapper is being featured in 2nd edition of Solid Earth Encyclopedia as accurate and ultra-light field resistivity meter (Loke et al., 2011).