Contribute to digital cartography with OpenStreetMap | Opensource.com

Contribute to digital cartography with OpenStreetMap

Posted 28 Feb 2013 by 

Eric Christensen (Red Hat)
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Maps touch our lives daily. Whether you are trying to find a nearby point of interest or directions to a faraway land, maps help us find our way. In recent years, maps have moved from paper into the digital world of cartography and open source contributors have been in the trenches gathering data for the masses.

In 2006, a group of map enthusiasts formed the OpenStreetMap Foundation. Registered in the United Kingdom as a not-for-profit organization it quickly grew to become a 400,000 person strong organization. Since the beginning of the project, volunteers from every continent have put their mark on the map showing where everything from roads to bike paths and from fire stations to ice cream stores are located. The information is licensed with copyleft licenses which allows anyone to use the information to build their own maps both paper and digital.

Creating the data is the challenging, and fun, part of the project. The United States maps got a head start by importing the Topologically Integrated Geographic Encoding and Referencing, or TIGER, maps from the United States Census Bureau into their databases. While this data wasn't free of errors, at least it gave people a place to start working and the country was no longer a blank slate. The maps truly came into form when volunteer cartographers walked, drove, and biked roads and trails with GPSs to obtain tracks that were later used as data points. Other volunteers traced satellite imagery to outline buildings, create roads, and mark points of interest. All of this data helps create a more complete picture of an area.

Other countries aren't as lucky as the United States with their public data. Open source mapping data was sparse in Haiti before the earthquake and subsequent tsunami of 2010. International emergency workers found that commercial providers didn't have much in the way of data either. As reported by Andrew Turner, the mapping community created maps of the country in just 12 days using historic maps and satellite imagery. That data was then formatted to be downloadable into GPSs that were used by aid workers on the ground. This data was provided to make it easier to move aid resources around the country and to get a better understanding of the impact of the disaster.

So what can you do with all this data? Well, pretty much anything you want. On a recent trip into Washington, DC, I decided to test the community data. Using the Open Street Map Automated Navigation Directions (OsmAnd) application, I plotted a course to the National Building Museum roughly 26 miles away. With only one turn not being available due to construction, I arrived at the musem around 40 minutes later. A success for the open source project! To help give back to the community, I added a new point of interest as we ate lunch at a new restaurant that hadn't made it to the maps just yet.

Recently the OpenStreetMap project has gained several sister projects including OpenHikingMap, OpenSeaChart, and OpenAeroChart. People are finding data wherever they go and most importantly they want to share what they find. But isn't that just the open source way?

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3 Comments

Matěj Cepl

The most important question: did you fix the crossroad with bad left-turn?

And actually, I would discuss a bit your claim that “Other countries aren't as lucky as the United States with their public data.” Well, of course, I wouldn’t argue that (again) Haiti is the most unlucky country around, but I think the thing which is worthy to be emphasized is the retention power of OSM (as any other open source project). TIGER maps are pretty bad (I know, I worked with them couple of years ago and they were hard to use even for displaying sociological data ... no fancy navigation involved), but I know about many other countries (true, mostly in Europe) which collected complete coverage (almost) for free. There is always some office in the national government which makes a map of something (e.g., forrest coverage of the Czech republic), then there is the other one, and when you put these together you may have a pretty nice foundation for making a map of the country. It seems to me that this retention power of the open source movement goes quite often unnoticed (or it is not mentioned even by the open source enthusiasts, because it is not so cool as what we created ourselves).

Thanks for the article!

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Sparks
Open Minded

Yes, you are correct in saying that other countries sometimes also make available their cartography data. I didn't mean to suggest that the US was the only one although I can see how my words didn't quite work well there. :) You bring up an excellent point that OSM is that long-term respository for data that can be used for a variety of projects.

I'll be working on a 'part two' to this article that discusses more of why people contribute and where/what open data has been imported. I want to beat the streets a bit more and talk to more people.

Thanks for the comment!

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Mike Ryan

To echo Matěj, a good example is the French Cadastre which was also imported into Openstreetmap

Cheers

Mike

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Eric started contributing to various open source projects in early 2007. Known in the community as Sparks, he is often seen writing about security and preparedness. His other interests include communication technologies, Cold War history, cartography, and sailing. He maintains the Fedora Security Guide and other publications and software packages for the Fedora Project.

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