[dougmccune]

Another thing you'll notice in that image is that sex offenses get treated differently than other crimes. My understanding is that in an effort to protect the privacy of the victims, those crimes never have accurate geolocations, and in your image it looks like they are always reported on the 1st of the month, so they probably also never have accurate dates/times.

There are a LOT of these types of idiosyncrasies in crime data. If you do end up interviewing police officers in SF ask them why they don't publish homicide data as part of their crime data (I genuinely don't know the answer).