This special issue of the Journal of Environmental and Engineering Geophysics presents a selection of research papers originally presented at the 9th International workshop on Advanced Ground Penetrating Radar (IWAGPR2017), held in the summer of 2017 in Edinburgh, Scotland. It has been a great pleasure and privilege to be the Guest Editors of this special issue and introduce this great range of topics on current GPR research.

The wide range of applications is indeed a key characteristic of GPR research, which spans areas that include geophysical investigation, system analysis and design, archaeology, and security applications. This diversity increases the...

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