Facebook Places and their coordinates

To make our travel guides we crawl a number of sources for travel information. The next step is to match the points of interest from these different sources on each other. This is quite complicated. OpenStreetMap may call the San Francisco Museum of Modern Art "SF MOMA" and wikitravel may call it "SFMOMA" - our job is to find out if they are talking about the same thing. We do this both for open content sources as well as copyrighted sources, such as Lonely Planet - but for these last sources we don't use the actual content of course, we just use them for reference.

An important element in the matching process, is the location. Different sources give different locations for the same pont of interest, of course, but they shouldn't be radically different if they're really talking about the same place.

If we look at how far the coordinates from a sources for its points of interest are from the coordinates of OpenStreetMap we get the following overview:

SourceAverage distance to OSM
TripAdvisor65.8 meters
Facebook43.8 meters
Lonely Planet51.6 meters
Frommer's75.7 meters

As we see the distance is smallest for Facebook - which means the coordinates of Facebook places are more like the ones found in the OpenStreetMap than in any of the other sources. So we thought let's have a look how many points of interest have a distance that's under 1 meter. In other words: which percentages of all points of interest have the same coordinates. We don't need a table for this. The answer is 15% of all Facebook points of interest have almost exactly the same coordinates as the OpenStreetMap. For other sources this is under 1%. Wow. You can hardly call this a coincidence.

Foto CC by Roger and Renate Rossing

For a moment there we thought that Facebook was copying OpenStreetMap coordinates (which is allowed) without crediting the OpenStreetMap (which is not allowed). But before making any (wild) accusations we dug a bit deeper. We looked at how much the coordinates matched in different countries. And it seemed that most of the difference we saw between Facebook and the others was explained by one country: the United States. In the US alone a whopping 37% of the coordinates of Facebook were exactly the same as the ones found on the OpenStreetMap.

If Facebook had really been using OpenStreetMap to seed their Places database with good coordinates, why had they only done it for the US? There had to be a better explanation. And there is. Unlike any of the other sources OpenStreetMap actually shows where coordinates come from (they don't make them up either). We checked some ten points of interest that had exactly the same coordinates and found all of them had one single source: GNIS So both OpenStreetMap and Facebook use GNIS for their location database.

And GNIS is free to use, for all, without the need to mention where it's from. It also explains why every single church in the US is on Facebook Places - it's not just because Americans like to check in every Sunday morning.


Eddy Hamoen said...

Smart digging! How's triposo doing??

eddy hamoen

Richard Osinga said...

Hey Eddy, we're doing great! There will be a new app soon.

Elizabeth J. Neal said...

I won't even go there, but honestly, in one regard I am in a near-constant cringe mode when it comes to small business's use of Facebook: contests. Hack Facebook

Bima Sena said...

cara menghilangkan kutil pada kemaluan pria
cara menghilangkan kutil pada kemaluan secara alami
obat tradisional kutil kelamin
obat tradisional buat kutil kelamin
Mengobati kutil kelamin dengan obat tradisional
obat tradisional menyembuhkan kutil kelamin
obat tradisional untuk kutil kelamin
cara menyembuhkan kutil pada kemaluan
obat alami menghilangkan kutil kelamin
mengobati kutil kelamin dengan obat tradisional
obat alami menyembuhkan kutil kelamin
obat kutil kelamin tanpa operasi
Cara mengobati kutil secara alami
cara mengobati kutil di kemaluan wanita
obat paling ampuh untuk menghilangkan kutil

chenlina said...

nike air max pas cher
gucci outlet
michael kors uk
canada goose outlet
uggs for men
air jordan pas cher
ralph lauren polo outlet
burberry outlet
chaussures christian louboutin
coach factory outlet
kate spade outlet
christian louboutin outlet
coach outlet online
curry 3
uggs outlet
burberry outlet
ray ban sunglasses
replica watches
uggs outlet
jordan retro
official michael kors outlet
ugg outlet
mont blanc pen
true religion uk
louis vuitton handbags
oklahoma city thunder jerseys
coach factory outlet
ugg boots
ugg sale
louis vuitton outlet
ugg boots clearance
michael kors outlet
gucci uk
burberry outlet
louis vuitton outlet
coach outlet
louis vuitton handbags
canada goose outlet
louis vuitton outlet
louis vuitton

Pattrick Smith said...

That is true. Colleges and universities in Malaysia are overloading students with multiple essay assignments on perplexing topics. These essay assignments come with strict deadlines. Not all students are blessed with exceptional writing skills and analytical thinking ability that is essential for drafting a good essay.

evelyndana09@gmail.com said...

So, you could find us all time. United Check Cashing providing you the exceptional services with a hundred% pleasure within very short duration.
check cashing near me

kartik gupta said...

Couldn't be written any better. Reading this post reminds me of my old roommate! He always kept talking about this Assignment help| Need Assignment help

kartik gupta said...

I am an antique article collector and this article is one of the best I have ever read. I hope to see the same amazing work from you in future. Thanks Assignment help | Need Assignment help | Marketing Assignment help | Law Assignment help

Teresa Hamilton said...

Thank you for updating the information!
instagram viewer

Anosh Alassi said...

شركة تنظيف شقق بأبها
شركة تنظيف منازل بخميس مشيط
شركة تنظيف مجالس بأبها
شركة تنظيف مجالس بخميس مشيط
شركة تنظيف موكيت بأبها
شركة تنظيف موكيت بخميس مشيط

Alex Kurtzman said...
This comment has been removed by the author.
Thomas pedro said...

On the off chance that you are one of them who are confronting any fleeting monetary crisis, at that point you can demand to your moneylender for these advances. You can likewise to raise the credit sum on the off chance that you can persuade the bank that you have the adequate means for consistent reimbursement. auto title loans near me chicago

Students Assignment Help said...

To assist all the students around the world Students Assignment Help is a leading platform for accounting assignment help services. You can also get excellent assignment proofreading and editing services. With knowing all the needs of students we offer cheap assignment help services.

harry mario said...

Please continue this great work and I look forward to more of your awesome blog posts.
Gamesunblocked Unblockedgamesbeast unblockedgames77atschool

Assignment Help said...

I really appreciate the kind of topics you post here. Thanks for sharing us a great information that is actually helpful. Good day! Management course requires students to conduct market surveys, form case studies and project works. With a strict time limit it gets tough for students to match the standards. This results in a great loss of marks. If you want to avail Management Assignment Help services, you have found the right place. Our incredible team of experts will carefully prepare your assignments in the stipulated time so that you get the full worth of your money in the form of best grades. If you are stuck with your homework and want the best assignment help, you have reached the correct place. No matter what your subject is, we will efficiently take care of all your assignment needs. Our team is highly diverse and comprises of academicians from top schools. Just mention your requirements and will provide you the list of writers who are ready to take up your work. Your assignment will be delivered within the stipulated time in the format you have asked for. Marketing-Assignment-Help Is it getting hard for you to score better in home assignments? With our fabulous Assignment Writing Service, this won’t badger you any longer. Tell us about your homework through our website and we will provide you the best writers in the country who will fulfill your requirements in an ultimate fashion. Our services are renowned for we have served thousands of students already. We keep a strict watch over the content and regularly monitor the feedbacks to ensure there are no lose strings left behind.

Michael Jones said...
This comment has been removed by the author.
Liam said...

This is where you might have started your search for assignment help.The previous consumers give their feedback on the website to let the other users know about the quality of their service. For example, if you go to the All Assignment Help reviews, you can get to know the opinion of different users about their services. You can also check other websites to compare and select the best service for you. myassignmenthelp reviews

Ava Lee said...

Not sure if you're going in the right direction with your personal statement? Here are some personal statement examples to inspire you. Our ghost writer takes the valuable information from you and put them impeccably in the personal statement.

Students Assignment Help said...

Avail the best college assignment help services from Students Assignment Help by our expert writers who are proficient in writing Assignments. We cater assignment writing help to meet your requirements. We deliver all the academic writing works on time.

katey hopes said...

Being an academic writer from past 5 years providing assignment writing services to college and university students also associated with Myassignmenthelp platform. I am dedicated in providing best online academic writing services to the college students at the affordable rates.

hermilie johnson said...
This comment has been removed by the author.
hermilie johnson said...

Losing sleep over unfinished essays but can't afford the assistance of costly essay writers? Wondering whether the online service providers will write my essay cheap in UK? Facing a deadline for finishing the essay? Well, your anxieties end here. We have with us a team of essay writing services for UK students who can solve all your writing issues so that you score high grades in your essay assignment. They will deliver the completed essay to you well before the deadline. With decades of experience in helping students, this team of professional essay typers best in UK.

Michael Jones said...

Java Assignment help Students sometimes get troubles with these assignments and projects. While Java is still a fair programming language as compared to other languages, it is still very complicated to make assignments and projects. Students often take Java Assignment Help from the online writing services to help them out from this difficult situation