Commuter
Definition
An offender who travels from their anchor point into a geographically separate crime area to offend; the circle hypothesis does not reliably predict commuter anchor-point locations.
- Field
- Geographic profiling
- Contrast term
- Marauder
- Behaviour
- Travels from anchor point into a separate crime area
- Model limitation
- Circle hypothesis does not reliably locate commuter anchor points
Common questions
Why does the circle hypothesis fail for commuters?+
The circle hypothesis assumes the offender's anchor point falls within a circle drawn around their crime locations, which holds reasonably well for marauders who offend near home but breaks down for commuters, since their home base can sit well outside the geographic spread of their offences.
How do analysts try to identify commuter offenders in a series?+
They look at spatial clustering of offences relative to transport routes, travel-time analysis, and behavioural indicators such as offence timing consistent with a journey, then treat geographic profiling output with more caution and supplement it with other investigative leads rather than relying on distance-decay models alone.
Related terms
- Buffer Zone
- The area immediately around an offender's anchor point where offence probability is suppressed because the offender avoids committing crimes near recognisable locations...
- Circle Hypothesis
- David Canter and Paul Larkin's 1993 hypothesis that for marauder offenders, the anchor point falls within the circle defined by the two...
- Criminal Geographic Targeting (CGT)
- Kim Rossmo's algorithm for geographic profiling, incorporating a distance-decay function modified by a buffer-zone suppression factor; implemented commercially in the Rigel software.
- Distance Decay
- The empirical observation that the probability of an offence location decreases as distance from the offender's anchor point increases, reflecting the rising...
- Geographic Profiling
- A spatial analysis technique originally developed by Kim Rossmo that predicts the likely home or anchor point of a serial offender from...
- Jeopardy Surface
- The probability map output of geographic profiling, rendered as a colour-coded topographic display where high-probability zones for the anchor point appear in...
- Marauder
- An offender who operates radially from a fixed anchor point, committing crimes within a radius around that point and returning to it...
- Rigel
- The commercial software implementing the CGT geographic profiling algorithm, developed by Environmental Criminology Research Inc. in Vancouver and licensed to law-enforcement agencies...