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Abstract--Field experience has shown that soil conditions can have large effects on Ground Penetrating Radar (GPR) detection of landmines. We discuss available models for the prediction of the dielectric constant from soil physical properties including bulk density, soil texture, and water content. The soil dielectric constant determines the attenuation of the radar signal. The contrast between the dielectric constant of the soil and the landmine is critical in determining the strength of the reflection from the landmine. Field data show considerable spatial variability in soil water content over length scales from centimeters to kilometers. Even under the assumption that other soil properties are homogeneous, the spatial variability of soil water content can lead to large variations in the predicted dielectric constant and resulting GPR response. Index Terms--Bulk density, dielectric constant, ground penetrating radar, soil texture, spatial variability, soil water content. F Effects of soil physical properties on GPR for landmine detectio