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Show HN: Play with an interactive heatmap of SF crime (and other cities)

safemap.io

131–137 of 137 posts

Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)

#131

You need to divide crime counts by population density. Otherwise you're just plotting population density.

the issue is that the the specific population density is the density of workers, tourists, and people commuting through the area not the density of people who live there.

Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)

#132
post #122

Earlier quoted context omitted.

I just don't buy that it evens out. For example, go here: https://cde.ucr.cjis.gov/LATEST/webapp/#/pages/explorer/crim... Look at Florida: "The 2022 estimated Crime statistics for Florida are based on data received from 403 of 758 participating law enforcement agencies in the state that year." That's 54% participation. Look at Oregon: "The 2022 estimated Crime statistics for Oregon are based on data received from 215…

That might be a problem for state-level reporting but I'm not sure it really maps on to the city of San Francisco very well, tbf

Good point. Thanks.

Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)

#134
post #57

Great work! - The maps are pretty and scale nicely. The clarity and granularity of text is appreciated. - The controls are excellent. I might put the copy and help in the same single title/menu panel (without "viewing:" as obvious) Some other features I found myself wanting: - Visually bound the map so you can see when it can't be moved in a direction. Think about what to do when the control panel is open and the use…

Thank you for the great suggestions. You've given us a lot of great ideas to think about. Much appreciated!!!

Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)

#135
post #73

This is very cool. I turned on all the types of crime and a weird set of diagonal darker regions appeared in the avenues. Either this is some weird artifact of the geocoding or there's some really strange magnetic fields or something affecting crime.

Thanks. Yeah, we noticed this too. It seems to be just a strange quirk of the SF dataset, and only in the Richmond / Sunset districts. Or who knows, maybe it is true.

Re: Show HN: Play with an interactive heatmap of SF crime (and other cities)

#136

Earlier quoted context omitted.

There is an app called Citizen that notifies you about crime happening near you in real time

Damn, the police should start using that app!

It's vise versa. Citizen app listens to the police radio and puts the gps coordinates on the map with the descriptions taken from the police report. They have social network on top of that where people can submit videos and live videos
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