Dr. Norrie's Geologist App · professional module

Core Logging

Depth-indexed core logging with alpha/beta to true orientation conversion, hole survey interpolation, RQD, and stereonet output. The conversion is the part that gets done by hand and gets done wrong — here it is exact, and the maths is verified against known cases below.

Hole

Hole ID Core diameter

Downhole survey — depth, azimuth, dip (negative = down)

One station per line. Orientation at any depth is interpolated between stations.

New structure

Depth Alpha α Beta β

Type Reference line

Note

Hole orientation at depth—

True orientation—

Dip direction / dip—

Interval log — RQD & recovery

From To Σ pieces ≥10 cm Recovered

Lithology / description

RQD—

Recovery—

Converted structures — lower hemisphere0

Poles to planes, coloured by structure type. The orange cross is the hole axis.

Structures

Depth	Type	α	β	Hole az/dip	True strike/dip	Dip dir	Note

Intervals

From	To	Length	RQD	Rec %	Lithology

Verification — the conversion tested against known cases

Vertical holes. When a hole is within a few degrees of vertical the bottom-of-hole reference line is undefined, and α/β cannot be converted without an independently oriented reference mark. The app refuses to convert rather than returning a confident wrong answer.