June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Chapter 9, Mapping with Other People
#94 Geo-Warchalking with 2-D Barcodes
HACK
Why-Not Questions
Why not use RFID? It’s too expensive, and not generally available. All you
need with barcodes is a printer.
Why not just use a pointer or a URI? This isn’t just for connected devices such
as camera phones. Your digital camera might use a geobarcode to geoposi-
tion your photo. Your GPS could learn more about places and things via
barcodes. Encoding the information within the barcode makes the system
more open-ended and hackable.
Why not use n3 triples? I thought more software and hardware would under-
stand some form of XML, rather than n3. (I have never seen an n3-reading
app outside of RDF testbeds.)
Why not zip/gzip the data first? This is a pretty good point, which should be
investigated. I’m worried that this causes more complexity, and things to go
wrong. I want to see if doing this makes the barcodes less fault-tolerant.
See Also
• “Map Your Friend-of-a-Friend Network” [Hack #99]
• “Model Interactive Spaces” [Hack #95]
• “Set Up an OpenGuide for Your Hometown” [Hack #97]
—Chris Heathcote
Figure 9-4. A FOAF file encoded with a geobarcode
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.