PS-REP-200 · r1 REPRESENTATION OBSERVED ENGAGED

LIMIT DRAWN AS TERRAIN

A boundary of what can be seen is drawn with the same line as a boundary of what is there.

01 DEFINITION

Condition in which the reach of an instrument is worked out from conditions that keep changing and then drawn onto the same picture as the things it is looking for, so a limit of the observing is read with the confidence given to a feature of the world.

02 CONDITIONS

UNCERTAINTY UNRECORDED What the edge was computed from, and when, is not held with the edge.

TIME PRESSURE MODERATE The conditions move faster than the drawing is refreshed.

ERROR ASYMMETRY ASYMMETRIC Treating a limit as emptiness and emptiness as a limit fail in opposite directions.

OPERATOR STATE SUPERVISORY The person is judging coverage from a picture rather than from the instrument.

03 WHERE IT APPEARS

MEDICALThe extent a scan could resolve is drawn on the same image as what it found, and the edge reads as a finding.

ENERGYModelled coverage of monitoring equipment is shown on the network diagram beside actual measurements.

TELECOMPredicted coverage is drawn on a map with the same weight as the infrastructure it depends on.

MOBILITYSensing range computed from current conditions appears on the display as a fixed boundary.

CONSTRUCTIONSurveyed extent and inferred extent are drawn on one plan with the same kind of line.

LOGISTICSAreas outside reporting reach are shown as areas with nothing in them.

04 WHAT AEON WORKED THROUGH HERE

How far the instrument could reach depended on conditions that shifted through the day, and the reach was drawn on the same picture as everything else. An area shaded as beyond reach was read as an area where there was nothing, and the shading kept its shape on the screen long after the conditions that produced it had moved. The work went into what the picture says about its own edge — what produced it and when — rather than into drawing the edge more precisely.

What stays unresolved is how a drawn edge carries that it will move — an edge marked provisional is one people plan around anyway, and one drawn plainly becomes a place on the picture where nothing is expected to be.

05 LINKED TERMS

PS-CLS-025 STATUS READ FROM SILENCE PS-TRU-110 CONFIDENCE DISPLAY MISREAD PS-REP-170 SENSED AND RECEIVED PS-REP-180 CONTINUED AT FULL WEIGHT PS-DET-181 CONFIRMED ABSENCE PS-COO-183 LINK LOST TO GEOMETRY PS-REP-187 PRECISION OF THE UNBUILT