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Wonder if geographic profiling has been used in Audrey or SV's case?
http://www.rcmp-grc.gc.ca/tops-opst/bs-sc/geographic-g-profil-eng.htm
" A geographic profile provides the investigator with a geographic focus for the investigation. A series of maps identify the probable home and work locations of the offender. The maps also identify paths to use when searching for the offender. A geographic profile can also list multiple suspects in a priority order based on their residence or work locations.
Identifying a catchment area: A catchment area is the geographical area served by an institution, retail, or other facility. Using a mathematical process (a Thiessen polygon analysis), a geographical profiler can determine the catchment areas of a series of locations. For example, the process could identify the catchment areas of the grocery stores in a city. This service is useful for identifying the area of investigation in some cases.
Time, speed and distance calculations: These calculations can help an investigator who needs to know how far an offender can travel in a given period of time or how much time an offender would require to travel a given distance. A geographic profiler can determine time, speed, and distance calculations for walking, jogging, riding a bicycle or driving a vehicle."
https://www.e-education.psu.edu/files/geog885q/file/Lesson_04/krossmo.pdf
http://www.rcmp-grc.gc.ca/tops-opst/bs-sc/geographic-g-profil-eng.htm
" A geographic profile provides the investigator with a geographic focus for the investigation. A series of maps identify the probable home and work locations of the offender. The maps also identify paths to use when searching for the offender. A geographic profile can also list multiple suspects in a priority order based on their residence or work locations.
Identifying a catchment area: A catchment area is the geographical area served by an institution, retail, or other facility. Using a mathematical process (a Thiessen polygon analysis), a geographical profiler can determine the catchment areas of a series of locations. For example, the process could identify the catchment areas of the grocery stores in a city. This service is useful for identifying the area of investigation in some cases.
Time, speed and distance calculations: These calculations can help an investigator who needs to know how far an offender can travel in a given period of time or how much time an offender would require to travel a given distance. A geographic profiler can determine time, speed, and distance calculations for walking, jogging, riding a bicycle or driving a vehicle."
https://www.e-education.psu.edu/files/geog885q/file/Lesson_04/krossmo.pdf