TechnicalGIS

#Geological model

3 posts

Rendered 3D print of the Crickley Hill ground model, 198 by 145 by 71 mm, looking north-east up the escarpment. Brown superficial deposits cover the western slope, orange Inferior Oolite forms the scarp and plateau, pale yellow Great Oolite caps the south-east, and the side walls show a band of olive Bridport Sand over blue-grey Lias mudstones.

Tutorial Python Part 7 of 7

3D-print a geological ground model: one watertight STL per stratum

Turn the kriged stratum surfaces from Part 5 into a multi-material 3D print of the Cotswold escarpment at Crickley Hill. Cut a window, decide what is too thin to print, build one solid per unit with mesh booleans, prove the parts fit exactly and are watertight, and write five STLs and a colour 3MF for AMS and MMU printers.

Advanced 11 min read

3D block model of the A417 ground model looking north-east up Crickley Hill: blue-grey Lias mudstones form the vale and the lower walls, under a band of olive Bridport Sand, a thick orange band of Inferior Oolite and pale yellow Great Oolite on the plateau. Black vertical lines mark the logged boreholes, and a faint buff skin shows the LIDAR ground lifted off the superficial deposits.

Tutorial Python Part 5 of 7

A 3D ground model from AGS4 boreholes: kriged stratum surfaces in Python

Pick rockhead and the top and base of the key formations from real AGS4 logs, krige them into stratum surfaces under Environment Agency LIDAR ground, and build a 3D ground model of the A417 escarpment in PyVista. Then test it: leave-one-out cross-validation at every borehole, kriging standard deviation maps, a check against every hole that stops short of a surface, and proof that no surface crosses another.

Advanced 15 min read

3D view looking north-east up Crickley Hill: LIDAR terrain shaded from green in the vale to buff on the plateau, with 10 m contours, and 112 borehole logs drawn as vertical cylinders coloured by formation. Blue-grey Lias mudstones fill the holes in the vale, orange Inferior Oolite limestones those on the escarpment, and green Fuller's Earth those on the plateau.

Tutorial Python Part 3 of 7

3D borehole logs from AGS4 data in PyVista and QGIS

Build every borehole log in a real AGS4 file as coloured 3D cylinders at their true elevation under Environment Agency LIDAR terrain with PyVista, then style the same intervals in the QGIS 3D map view. Along the way, test whether neighbouring logs agree, and find a block of ground at the top of Crickley Hill where they don't.

Intermediate 12 min read