Log measurement on a handheld, with JAS volume per log

Atlas runs as an app on Zebra TC22 and TC27 handhelds. The measurer scans the log's QR tag with the built-in laser. On a device without a scanner, the camera reads the tag, or the measurer types it.

The small-end diameter (SED) is a whole number of centimetres from 6 to 80. The measurer sets it on a ruler control with one thumb, or types it.

Atlas applies the JAS log scale to each reading: cubic metres equal the SED squared over 10,000, times the length in metres minus 0.1. Atlas uses the same figure as the customs volume, rounded to 3 decimals, so the yard tally and the export paperwork agree.

A worked example: a log with an SED of 30 cm and a length of 4.0 m gives (30² / 10,000) × (4.0 − 0.1) = 0.351 m³. No spreadsheet, no second calculation at the office.

Atlas rounds the SED down to an even diameter class and assigns the export grade from that class:

Yards rarely have steady coverage everywhere. Measuring works offline: readings stay on the handheld and sync when the signal returns, so a dead zone does not stop the crew.

Some steps need a connection on purpose. Recording weights and closing a delivery note wait for the signal.

Several measurers can share one handheld. Each one switches to their own measurer number with their PIN, so the record shows who took each reading.

When two readings of the same log disagree, Atlas does not pick one quietly. It keeps both as a measurement dispute for the office to resolve.

Each log keeps its tag, SED, length, species and origin forest. A figure in the packing list traces back to the log behind it and to the truck it came in on, which is the answer a buyer or an auditor asks for.