The crime grid is a randomly generated quarter mile grid that covers the City of Portland. The crime grid is the geographic unit used to aggregate and summarize occurrences of crime types within the City. Since multiple crimes may be reported to the same location, occurrence points may overlap and display an incomplete picture of the total number of crimes reported at that location. The crime grid is shaded to display the frequency of crime occurring within each grid. As the number of crimes increases within a grid, the color of the grid changes.
Many factors can influence meaningful comparisons between crime grids.
Other factors may also affect reported crime in some areas including organized neighborhood Block Watch Block Captain programs, targeted police enforcement, or proximity to commercial and commuter zones. Sexual Assault crimes cannot be displayed by occurrence points. For additional information about crime in your neighborhood, for more information about the block captain program, please visit Office of Neighborhood Involvement . Every attempt is made to pinpoint the exact time date and time a crime occurred. If the record dates and times fall within a three hour span or within the overnight category, CrimeMapper will include those crimes in the appropriate graph time block or overnight category.