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Missing and uncertain values
Not observed, not recorded and uncertain are different states. They should remain distinguishable from a numeric zero.
This atlas connects descriptive vocabulary, observation context and reference-sheet design. All example records are synthetic and exist to explain a method of documentation; they do not represent tested batches, product ratings or scientific results. The diagrams are original editorial graphics. Descriptions of perceived character are kept separate from ingredient, origin, health and certification claims. Read definitions and scale anchors before comparing records.
Practical example
Use separate status fields for missing context and uncertain attribute interpretation.
A blank cell must not silently become a zero in a later chart.