A contour plot is a two-dimensional visualization that represents three-dimensional data by drawing contour lines (isolines) — curves connecting points of equal value — across a coordinate plane. Each line encodes a specific scalar value; the spacing between lines indicates the steepness of the underlying surface. The visualization is produced by computational interpolation of discrete samples and rendered as vector lines or filled bands. Persistence mechanism: mathematical convention encoded in plotting libraries, cartographic software, and scientific publication formats. [formal: planum aequivalentium | substrate: mind | horizon: a moment | explicit: yes | epoch: 0.26]
Accepted ontology entry
contour
A contour plot is a two-dimensional visualization that represents three-dimensional data by drawing contour lines (isolines) — curves connecting points of equal value — across a coordinate plane. Each line encodes a specific scalar value;…
Definition
Why it is in scope
A human-made cartographic convention of drawing lines that connect points sharing equal measured value — elevation, temperature, pressure — on a map or diagram. Built to persist through surveying practice, printing, digital terrain models, and the shared convention that a contour line means 'same value here'
Names and aliases
- contouren · CANONICAL
Relations from this entry
- cmri8h6um00c86olqbqp5uvxcDERIVED_FROM →
contour as a concept of a continuous line tracing boundaries of equal value (elevation, pressure, etc.) is derived from the concept of boundary. Which-came-first: boundary as a general concept predates the specific notion of contour lines. The contour is boundary made continuous.
- cmrxqh5nw03vksoac1tgfpgi9INSTANCE_OF →
contour plot IS a specific kind of chart: a data visualization using contour lines to represent 3D surfaces on 2D space. Per Law 9: specific→general. A competent speaker calls it 'a chart.'
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 23, 2026, 1:40 AM UTC
- Content hash
- a53eed095310b5b4a3dbf804f5501d7bb4b165d5867f6e3845115131aeec1fa5