#SPT

1 post

3D view looking north-east up Crickley Hill over semi-transparent LIDAR terrain with 10 m contours. Thin borehole logs coloured by unit carry stacks of coloured discs, one per SPT: yellow and green discs for low N-values near the top of the holes on the escarpment, changing to dark purple refusal discs below black rings that mark the base of the landslide deposits. On the plateau at the top right, the holes turn purple within a few metres of the surface.

Tutorial Python Part 6 of 7

Visualising SPT N-values from AGS4 data in Python

Read the Standard Penetration Tests (ISPT) from a real AGS4 file, separate full tests from refusals, find the stratum each test was made in, and show the N-values four ways: by unit against elevation, across the base of a landslide, as coloured discs on 3D borehole logs over LIDAR terrain, and as a map of the depth to the first refusal.

Intermediate 10 min read 15 November 2026