Crime geographic profiling is also known as geographic profiling or spatial crime analysis.
This is a very special criminal investigation technique.
It is particularly suitable for investigating a series of serial cases, such as serial murders, serial robberies, or the serial disappearances in Baole City.
Because this type of serial case can provide multiple crime locations.
Criminal geographic profiling is to analyze these locations to identify the suspect's possible residence or activity areas.
The most fundamental principle of this technology is the distance attenuation phenomenon.
Based on the analysis of countless cases, it is found that criminals who commit serial crimes usually do not commit crimes near their usual residence.
But they will not go to places that are too far or too unfamiliar to commit crimes.
Most of the time, they tend to move in a comfort zone that they consider safe and relatively familiar, but at a certain distance from their usual residence or place of residence.
In addition, it also involves the principle of crime proximity and least effort, the principle of crime comfort, the crime buffer zone phenomenon, etc.
This involves criminal psychology, criminal investigation, criminal geography, etc.
In short, there are certain rules.
Thus this discipline was formed.
By screening and prioritizing the locations involved in the crime, investigators can be provided with insights into the suspect's activity areas.
The reason why Chen Ting focused on this technique was because the disappearance locations of the thirteen victims in the missing girl case were exactly the research content of criminal geographical profiling.
Moreover, it is very targeted.
Shen Ting looked directly at Song Huaimin and Jiang Daoqing, and saw that the two and other police officers were all looking at him curiously.
Chen Ting smiled and said, "I want to try using criminal geography profiling to find the murderer's activity area based on the location where the victim disappeared."
When these words were spoken, everyone around was stunned.
Jiang Daoqing was surprised:
"I've heard of criminal geography profiling.
It should be what we often call geographical portrait!
This technology can indeed analyze the location involved in the crime.
However, it cannot lock onto the suspect and can only fix a key investigation area.
To be honest, most of the time, the use of this technique is very limited.
There are people in my team who know this technology.
Moreover, since this case is a series of disappearances, it is particularly suitable for geographical profiling.
Before, when we went to the scene to look for clues, Xiao Zhang was also using this technique to try to determine the murderer's activity area..."
Jiang Daoqing gestured to a middle-aged police officer beside him.
The middle-aged police officer quickly stood up and nodded to Shen Ting.
“Team Leader Shen, I’m Zhang Song.
My research is about the geography of crime.”
As he spoke, he controlled the computer in front of him and pulled up a map.
And project it onto the electronic whiteboard on the left.
“Team Leader Shen, this is a map of Baole City.
The thirteen red dots above are the area where the thirteen missing girls were last seen.
There are limited clues in this case. Through my analysis of the existing clues, the distribution pattern of the missing locations is more inclined to a circular center model..."
There are actually many locations involved in the case that require geographical profiling.
For example, the primary crime scene, the route where the body was transferred, the place where the body was dumped, the place where the victim was last seen, etc.
If this information can be integrated, the judgment of the suspect's activity area will naturally be more accurate.
In this case, only the last place the victim was seen is relatively clear.
As for the center-of-circle model mentioned by Zhang Song, it refers to the locations involved in the crime, which are distributed in a circular shape around the murderer's activity area.
In addition, there is a fan-shaped model——
Crime locations are distributed in a fan-shaped pattern according to transportation networks or other factors.
Or a multi-center model, where offenders have residences, places of work, and multiple areas of activity.
These models are the conclusions drawn by predecessors after analyzing each case.
Zhang Song pointed to the black area in the center of the map with thirteen red dots:
"I used my own computational model to finally confirm that the murderer was most likely active in this area.
However, we conducted a large-scale search of that area a few days ago, but did not find any clues related to the case.
I guess the murderer is hiding too deeply.
Or, the locations involved were too singular, leading to a large margin of error and a significant error in the scope of the investigation."
Shen Ting looked at the geographical portrait report of Zhang Song in his hand and nodded slightly.
Although he has not yet mastered criminal geographical profiling, it can be seen from the analysis process that Zhang Song is very professional.
In the group!
The three-member corpse search team also left messages.
Hannibal: “I noticed the black area he circled when I was looking at the information before.
However, after looking at the topographic map of that area, I can only say that the place where the bodies were dumped should not be there.
Because that area is a residential area, the environment is not suitable for disposing of bodies."
Jigsaw echoed, “Indeed!
I'm not sure whether the murderer lives here.
But the place where the body was dumped is most likely not here."
Kira Yoshikage also said:
"Not only is this where bodies were dumped, but if I were the murderer, I wouldn't bring the victim here. The risk is too high."
Forensic pathologist Qin Ming: "This is also where geographical profiling has greater limitations.
If there is insufficient information, it is likely to lead to large errors in the delineation of the area.”
…
at the same time!
After seeing Zhang Song, Chen Ting and the others finish their discussion, Director Song Huaimin immediately said impatiently:
"Team Leader Shen, do you think there are any suspicious locations in the black area circled by Officer Zhang, especially where the body was dumped?"
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