TechnicalGIS

#Geological section

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Geological cross-section 3.2 km long from the vale at A, up the Cotswold escarpment at Crickley Hill, to the plateau at I. A dark LIDAR ground line climbs from 121 to 281 m OD over a buff band showing the ground across the corridor. Forty-five strip logs hang below it, coloured by formation: blue-grey Lias mudstone in the vale, orange Inferior Oolite limestone on the escarpment and green Fuller's Earth on the plateau. Coloured lines join the contacts between holes, and red diamonds mark three holes where the base of the limestone is 11 to 15 m low. A map inset at top left shows the bent section line and its corridor on a LIDAR hillshade.

Tutorial Python Part 4 of 7

A geological cross-section from AGS4 boreholes and LIDAR in Python and QGIS

Draw a 3.2 km geological cross-section up the Cotswold escarpment from real AGS4 borehole logs, with the ground profile from Environment Agency LIDAR. Project every hole in a corridor onto the line, pick and correlate the contacts, and measure how much of each correlation line rests on a log and how much is inferred. Then draw the same section with the QGIS elevation profile.

Intermediate 15 min read