The TL is high-crime and the Mission bart stations have crime. Not exactly shocking to anyone who has lived here
I was interested to see that there are only really prostitution arrests in the middle of the mission!
Show HN: Play with an interactive heatmap of SF crime (and other cities)
21–30 of 137 posts
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#22The TL is high-crime and the Mission bart stations have crime. Not exactly shocking to anyone who has lived here
I was interested to see that there are only really prostitution arrests in the middle of the mission!
yes, shotwell and capp are a pretty obvious corridor if you want to witness it ever
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#23FYI none of your images are loading for me, they all return 301s repeatedly until the browser gives up.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#24You need to divide crime counts by population density. Otherwise you're just plotting population density.
this is not a map of population density it’s pretty clear just the SRO strip/TL and then the two mission bart stations
But it's interesting to see that this is not true for all crime categories. E.g. car break-in hotspots are by Fisherman's Wharf and the side of Alamo Square with the Painted Ladies -- i.e. prime tourist locations.
However, I suspect there are some basic data errors upstream of this visualization tool that also limits its usefulness. E.g. 'rape' has a giant hotspot centered at the south side of the intersection of 8th and Mission ... which is site of a city Adult General Assistance office. I am guessing these are being tagged with the location where the victim gave a report, not the location where the crime happened.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#25Earlier quoted context omitted.
Depends on how the map is being used. If I'm looking to avoid traveling through neighborhoods with a high robbery risk (e.g. as a tourist), I'd prefer absolute numbers vs. per capita.
That's probably not the correct analysis, because the number you're trying to estimate is not P(a crime occurs near you), it's P(you will personally be the victim of a crime). Crime rate over density won't necessarily do that either (since the population density of a primarily commercial+touristy area, e.g. Fisherman's Wharf, is << the number of people who are present there on a given day), but neither does raw count…
As a tourist in SF recently I was interested in seeing the whole city, warts and all, and I did.
I don't really understand why as a tourist you'd want to use this map for a short trip, unless you were going somewhere that's a literal war zone. Most cities just aren't statistically dangerous for a tourist unless you go out looking for trouble. You're much better off applying common sense than digging through digital maps of (reported) crimes.
If I was looking for somewhere to live then it would be more interesting I think.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#26Earlier quoted context omitted.
It's an important truth that walking a mile in a high population density area puts you at a higher crime risk than walking a mile in a medium or low population density area.
Not really, since your chance of being a victim is divided by the number of people in the area.
> Not really, since your chance of being a victim is divided by the number of people in the area.
Depends on behavior. If I stay in my room all day, I don't contribute to your divisor. If Jack Dorsey doesn't walk around alone past midnight, he's not absorbing the same risk quotient either.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#27FYI none of your images are loading for me, they all return 301s repeatedly until the browser gives up.
Hmm, thanks. Hopefully this doesn't include the map itself. Would you kindly provide the browser / OS combo you are operating? Will try and look into this.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#28Location based danger zone notifications would be helpful. "Warning: You are entering an area with a large number of reported muggings."
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#29You need to divide crime counts by population density. Otherwise you're just plotting population density.
Thanks for checking out the site and for the feedback. It's definitely something we're looking into. It's kind of an interesting question though because it somewhat varies by crime category. Take car break ins, for instance - this is more of a constant factor than a population density scalar because the number of parking spots is generally fixed on a per-block basis rather than scaling with population density. I thin…
Yeah, I think having it as an option is the way to go. Though I’d personally have it default to per-capita, as I do think that correlates closer with actual risk. To illustrate with an extreme example, an area with 10 burglaries per 100 people is clearly a way higher burglary risk place to live than an area with 20 burglaries per 10,000 people.
Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)
#30Location based danger zone notifications would be helpful. "Warning: You are entering an area with a large number of reported muggings."
or a warning every time you get into your car "Warning: locations like these have a significantly higher fatality rate"