This is the letter from Masayuki Oishi at Daiki SOIL & MOISTURE in Japan.
He developed the new technology of subsurface visualization and this is named as CPT-Video-CONE.
This is the reliable method that geotechnical engineers can collect various subsurface information and also quantitative data during taking a video.
So they can see subsurface situation and get well information.
Now, the photograph under the ground is applied to make the geologic cross section and also construction quality evaluation before and after soil improvements.
