This map shows NYPD Crime Data for the Seven Major Felonies. The data have "Compstat Dates" from January 2015 thru September 2015. (Compstat date is the date the incident was reported to the NYPD and subsequently entered into the Department's record management system). One anomoly is that rape incidents are geo-coded as occurring at the police station house within the precinct of occurrence. There are others so read the notes carefully before interpreting what you see. Read the full data footnotes here.
Since the point location of each incident has been modified to the midpoint of the street segment it occurred on, mapping simple point markers would have resulted in many overlapping points on segments with multiple incidents. The technique used to render this map "stacks" the markers for a given segment, allowing you to see multiple incidents. Hover over a marker to see the occurrance date and type of felony.
Data was pulled from the NYC Open Data Portal on 30 December 2015.