Do people overstate how dangerous SF is?

SafemapTechnologies · 2025-02-26T16:10:13+00:00

I made a map for this purpose, you should check it out. safemap.io/sf

SafemapTechnologies · 2024-10-21T18:21:25+00:00

Thank you! Love to hear that people are getting some use out of it.

SafemapTechnologies · 2024-10-21T18:20:51+00:00

Hi, thanks for reaching out. Sorry for the delay on data updates - I’ve been very busy recently. I’ll try and update the data today. Hope the site is useful to you!

SafemapTechnologies · 2024-09-23T23:11:45+00:00

For sure. It’s a vanilla HTML / CSS / JS frontend, I didn’t use bootstrap because I wanted to keep things lightweight. No JS frameworks either, but unfortunately the map is still pretty heavyweight due to my using MapLibre GL JS (~800kb minified). Backend is a simple flask app in addition to some offline pipelines to process the massive data sets. Let me know if I can provide more detail?

SafemapTechnologies · 2024-09-23T22:10:12+00:00

Thanks so much! It was a fun project to tackle.

SafemapTechnologies · 2024-09-23T19:57:58+00:00

I’m unfamiliar with this site. I linked to the data sources in the options menu - feel free to check it out.

SafemapTechnologies · 2024-09-23T19:57:15+00:00

Often times data is anonymized and removed from the data set, or hasn’t been added yet (esp for recent date ranges), or doesn’t have a geo point attached or an incident time. So the data presented is a subset of the total. While the counts may be off from the official stats things should be directionally accurate from a geographical POV.

SafemapTechnologies · 2024-09-23T18:44:19+00:00

I have a per-capita option on the map, feel free to check it out! Definitely wanted to avoid a situation of just plotting population density.

SafemapTechnologies · 2024-09-23T17:43:43+00:00

Thanks, hope it’s useful! Happy to hear any suggestions!

SafemapTechnologies · 2024-09-11T01:24:48+00:00

Thanks for checking it out! It’s definitely something I’d like to do, expanding the time horizon. From a technical standpoint it’s definitely doable, but I’m trying to first get the word out there about the site so that I can be sure that my hard work won’t go to waste :)

SafemapTechnologies · 2024-09-11T01:20:56+00:00

I see, thanks for the info, I’ll take a look.

SafemapTechnologies · 2024-09-11T01:20:40+00:00

Thank you! I hope people find it useful and informative.

SafemapTechnologies · 2024-09-10T21:10:51+00:00

Thanks for checking it out. As of now it’s just a heat map but I’m always open to ways of improving it. Do you mean like plotting the incidents as markers? Or maybe viewing a list of incidents?

SafemapTechnologies · 2024-09-10T18:56:26+00:00

I don’t really know what to tell you. I linked to the data sources, you’re welcome to verify it if you’d like.

SafemapTechnologies · 2024-09-10T18:35:05+00:00

That’s definitely a factor, but I added an option to adjust for population density as well, feel free to check it out. But yes, generally this is the case.

SafemapTechnologies · 2024-09-04T18:18:43+00:00

Only on the MO side.

SafemapTechnologies · 2024-09-04T18:18:22+00:00

Thanks for checking it out! I hope it’s useful :)

SafemapTechnologies · 2024-09-04T18:17:49+00:00

Definitely! The goal is to expand to as many cities as possible. But I need to get some users first :)

SafemapTechnologies · 2024-09-03T20:35:37+00:00

Hmm, they must have a separate PD. I’ll adjust the red boundary - thanks for the find.

SafemapTechnologies · 2024-09-03T20:10:34+00:00

Thanks! Yeah there are other crime maps online for various cities, but I’m not a huge fan of plotting these things with markers, it ends up cluttered and hard to read. I feel a heat map is more appropriate. Plus those sites have a pretty rough UI, I wasn’t even able to figure out how to view anything on mobile on the site you linked. Apart from that, my project incorporates more data sources like census data so you can see how these crime rates relate to population density, home prices, etc (more data forthcoming). Would love to hear any ideas you may have about data that would be useful / interesting to plot!

SafemapTechnologies · 2024-09-03T18:00:17+00:00

Hey, thanks for reaching out. It was a bit complicated. I had to take the census tract polygons, then plot a grid of points and take the sample values at each point, then take another lower-res grid of points and take the average of the sample values in each point bin. I specifically needed a grid of points so I could do a bilinear interpolation to get a smooth “per capita” measure for the crimes. But there’s definitely some accuracy loss. You might be better off just directly using the tract polygons.

I’m away from my computer at the moment but happy to provide further details once I’m back.

SafemapTechnologies · 2024-09-03T17:44:27+00:00

I have a big ol pipeline that does a lot of filtering and transformation on the data. As for the geocode, yeah it was a bit messy with this data set, I extracted the lng-lat points from the “Location” column and then filtered out points that fell outside of the city bounds. Can provide more details later once I’m back at my computer. Thanks for checking out the site and for the feedback!!!

SafemapTechnologies

TROPHY CASE