Most likely, it was secondary data -- that is, analysis -- that led to these houses' placement on the map.
There are several elements that could be useful to this map that are not included. For example, the division of the community into different areas (residential, commercial, industrial, etc.) might provide some more clues to the rate/placement of the burglaries. Similarly, median incomes/home prices for each given area might be important elements. There is very little about the map that is not pertinent, however; though there appears to be little relation between the burglaries and the location of suspected drug houses, this is important to know and recognize, and leaving the drug houses off the map would eliminate this knowledge. Other information that could usefully be included in this map includes some basic details about the individual burglaries -- whether cars were broken into or left unlocked (especially important in isolated...
Also, the type(s) of crimes that the parolees were convicted of would shed some light on the obvious relation between some of these parolees and nearby burglaries.
This is the major pattern that requires further analysis. The relationship between certain parolees and motor vehicle burglaries in the immediate vicinity is made very recognizable by the visual depiction on this map, in a way that a textual analysis or representation would not have made clear. In order to further analyze this relationship, one would need to look into the details of the criminal backgrounds of the parolees who reside near places of multiple motor vehicle burglaries. There also appears to be a prevalence of burglaries in a certain section were the railroad tracks run near the river. Further research into the economics/zoning of this area might lead to more clues about motor vehicle burglaries.
