Flawed Map Says L.A.'s Crime Highest Next to Police HQ

CNET briefly describes how a poorly chosen default behavior has led to an online crime map of Los Angeles (on a site designed at a cost of $362,000) that shows that "a location just a block from the department's new headquarters is the most crime-ridden place in the city." I wonder how often this sort of error would completely skew things like real-estate maps that attempt to show whether houses in a certain neighborhood are worth more than those in the one next door.

Comments

Quick!

[palegray.net]

Get those properties while they're cheap! Well, cheaper than they already were, considering the economy.

Re:Quick!

[samriel]

And I posted anonymously so you couldn't tell who I am! Ta-ta!

-jcr

That's some mighty fine detective work there, Lou.

Re:Quick!

[palegray.net]

Is that a rhetorical question? Can't speak for L.A., but my car suffered an attempted break-in via the windshield of all places while Sacramento cops sat in the parking lot of a La Quinta motel. I was traveling from Washington to Georgia, and got nothing more than a shrug and a "that sucks" from the police when I noticed the prised up seal on my windshield the next morning.

Perhaps criminals are getting more brazen

[superyanthrax]

More seriously, they should probably have had the program throw an error in case they could not find a certain location rather than putting the crime report at an arbitrary location. That would have caused the problem to be discovered earlier.

Re:Perhaps criminals are getting more brazen

[Trepidity]

There's ways to balance that, depending on what your needs and visualization methods are. For example, if you know that a significant proportion of your crime reporting gives only district-level precision, not pinpointing to specific addresses, then it'd be more honest data presentation to just produce a colored-in map on a district-by-district level, and not attempt to give more detailed maps. If you do still want to give the more detailed maps, then at least average the un-localized things across the district instead of putting them all in one place.

To use an actual (fairly simple) example that came up in my work recently: say you have some date figures, most of them with years but some only with decades. The wrong thing to do is to put the "1960s" datapoint at 1965, because then you get spurious spikes in the middle of every decade. Several more correct options are: just produce decade-by-decade visualizations, or else produce year-by-year visualizations, but assign a "1960s" datapoint as a 1/10-weight datapoint in each of 1960 through 1969.

Re:Perhaps criminals are getting more brazen

[CAIMLAS]

It is actually plausible that crime is higher by a PD. Consider that police operate effectively largely on the basis of force projection. Projecting force means they've got to spread out and, in part, create a perimeter within which they operate. The PD may have relied upon the force projection (ie the psychological influence the building would have) of the building, in part.

Also consider that a PD is more of a hub; police officers are coming and going to their respective patrol areas, going and coming off of shift. They are most likely not thinking "work" - ie, find criminals - at this time.

The PD may have been strategically placed where it was to dissuade crime in that specific area. I know that in the two largest cities in my state, the PDs are at, or near, the epicenter of low-income and crime (they're also just off the city centers). I lived near one of these PDs once, and it was indeed a higher crime area.

Re:Perhaps criminals are getting more brazen

[belg4mit]

Choropleths are dangerous because most amateurs don't plot density.
The eye naturally integrates over an area of uniform color, and so
you must not create maps of raw magnitude if the mapped regions
vary (significantly) in size. Otherwise, a small area of high-crime
will appear less significant than a large area of moderate crime.

Flawed?

[MindlessAutomata]

Seeing how rogue so many police officers are, it might not necessarily be quite off the mark.

Re:Flawed?

[pjt33]

What do you mean, "not quite off the mark"? It's a whole block out!

Criminal activity detection...

[RyanFenton]

It's not a legally recorded crime unless someone is caught and convicted. It's not surprising that these crime maps would show this result - the places that police officers are most likely to be, are the places where the most crime is "found".

This is akin to saying that the places where the most vehicular crime occurs are where speed traps and automated traffic cameras are located.

If you had a world with absolute and omnipresent law enforcement, and that society could somehow actually function, my guess is that the map would match a map of the average human traffic in a given location.

Ryan Fenton

OT - thanks for SimCity tag!

[TJamieson]

For those who never played SimCity 4, it has a very strange bug where you would be notified about a "crime den" (implies high crime). However, when you went to the area being described, it was 99% of the time directly next to your police station.

Fortunately, it only lasted as a blip -- no increased crime, but still rather goofy.

Wrong picking

[gmuslera]

All know that the highest crime locations always are in legislative government institutions, not in police stations (police choose to do their crimes far from there).

Wonder if US highest crime is geolocated in Washington.

Statistics, statistics...

[jareth-0205]

I know maps like these are a problem in the UK for a different, systematic reason: Crimes detected at the police station after an arrest have their location marked as having taken place at that police station. eg if someone is arrested and taken back to the station, and when asked to empty their pockets drugs are discovered, then the location of that crime is in the police station building. Of course, this sort of thing will happen every day...

Makes the crime map a bit interesting...

Seem like a no brainer...

[__aaclcg7560]

Would you build a new police station in a crime-infested neighborhood or in a rich neighborhood that would complain about the criminals that police bring in?

Do you live in LA?

[Amazing Quantum Man]

That's not a mistake. In LA, most of the HQ's *are* in high crime areas.

Downtown, Van Nuys, etc...

Re:Rape

[claysdna]

Men cannot be raped and blacks cannot be racists. It is written into the democratic partys national charter, accepted by all major news outlets, and become generally accepted politically correct behavior.

Er...

[mutube]

Isn't it a good thing that the police station is close to an area of high crime? Would we rather they were really far away?

$362,000

[ortholattice]

Is this a reasonable price for what seems to be an interface between google maps and the dept's crime database? Somehow it seems to me that a motivated person could do the basic design and coding in a few days. Then add in user feedback, layout redesigns ,etc., but still, should it really take even a couple of months for one person? As a crude guestimate, I would probably feel a little greedy or overly conservative bidding 6 months, of course I don't know the spec or what's really involved. What am I missing that seems to imply two person-years or more of work?

Actually,,,

[fireheadca]

The map is accurate for the most part, it's just a block off.

Baltimore

[N3Bruce]

Here in the Land of Pleasant Living (and also the setting for Homicide and The Wire), Baltimore's main Police HQ is set between President, Fayette, Gay, and Baltimore Streets. For those of you who aren't familiar with the area, the corner of Gay and Baltimore Street is one end of the city's infamous and long standing red light district, and Police HQ backs up to the heart of "The Block". One side of Baltimore Street are strip clubs and streetwalkers, along with the ever-present junkies, pickpockets, and pimps. The other side is the back of Police HQ, and parking is reserved for squad cars of Baltimore's Finest bringing in Baltimore's Worst at all hours of the day and night.