Category Archives: Uncategorized

The Invisible City

Now you see it …

There’s not a whole lot north of North Bay. Highway 11 winds through some extensive geometry, but few habitations. Until something wonderful (and quite a bit wrong) happened at 46° 31′ 21″ N, 79° 33′ 9″ W on OpenStreetMap. A whole new town about 25 minutes out of North Bay sprung up overnight — and was as quickly deleted as mappers caught and reverted the vandalism.

Now you don’t.

The misguided mapper put quite a lot of work into this ephemeral town. It’s got urban rail, parklands, residential areas and more. You can see the detail on this large image of the town (650 KB PNG). If you want to play with the data, here’s a zipped OSM XML file of the area before it was reverted. But please, don’t re-upload it; OpenStreetMap should be for real features on the ground, and not for confusing map data consumers.

Thanks to Bootprint for noticing this, and to rw__ for reverting the edits.

Mephisto’s Oriental Mystery — solved!

I bought a pair of Mephisto shoes today, and to go with their wayfaring imagery, the insoles are decked out with map-like symbols. Prominent is a map coordinate: N 38° 51.343′ E 94° 47.963′.

If you look at a map there, it’s a fairly empty mountainous place near the border of Qinghai and Gansu. It’s definitely not where the shoes are made, unless Mephisto have a stealth factory there.

There was something familiar about the coordinate, through. I thought I’d try flipping it to the western hemisphere:

It’s the Garmin headquarters in Olathe, KS! Every Garmin GPS I’ve ever owned has had the HQ as a default waypoint. I’m guessing a designer at Mephisto was looking to add something legitimately mappy to the graphics, and picked up their satnav to pull out a coordinate. Guessing that Olathe isn’t a very mysterious, rugged destination, they flipped the hemisphere to give it more eastern promise.

Updating maps … to outdated data

I caved, and bought a Garmin nüvi 1490. Not that my GPSMap 60CSx wasn’t great at routing, but remembering to update maps before travel and its fiddly mounting requirements were a pain.

So, two hours of downloading map updates, and I fire it up … to find that the three year old hotel in Dartmouth, NS we were staying in was in the wrong place on the map:

Compare with OpenStreetMap:

So now, back near home, I ask it to find a post office. Here’s me parked outside one; do you see it on the screenshots?

Again, compare with OpenStreetMap:

So I thought I’d help Garmin out, but their Report a Map Error page needs me to know the type of my GPS, its serial number, the type and revision of my map, my name and e-mail address, and the coordinates of the error. OSM has me spoiled: at best, I can go in and edit; at second best, I can drop markers on OpenStreetBugs to flag errors for others to fix.

Garmin already has my name, e-mail address, GPS type, serial number and map revision through myGarmin™. The company could just as easily have a web-based map correction system that would be point-and-click. Follow the Leader is one of Garmin’s mottoes. In terms of user correctability of maps, however, they’re only the leader because they don’t know they’ve been lapped.

APRS is go!

Automatic Packet Reporting System — APRS — is rather clever. It’s a way of reporting position, status or messages via the amateur radio 2m band. Data is relayed via digipeaters, and routed to/from the internet APRS-IS system to any user worldwide.

It’s a little fiddly to set up, even with a very polished (read: $$) handheld radio like the Kenwood TH-D72A. I’m a bit disappointed that the purported SiRFstar III GPS in this radio takes forever to get a lock, but it’s a nice radio despite this.

The screenshot above shows aprs.fi‘s tracking of my handheld (VA3PID-7) last night as I walked to Toronto Mappy Hour.

Mac OS X killed my Garmin!

My GPSMAP 60CSx had started to become unreliable: crashing after startup, randomly locking up in mid route, and just generally being an aggravating piece of kit. I was really close to replacing it.

The problem seemed to appear after I’d used USB Mass Storage to transfer archived track logs to the computer. As a last resort, I tried removing the hidden files that OS X creates on every removable disk, and now all is well. It’s annoying and inexcusable that Apple chooses to do this, but we work around.

To delete these files from the terminal and eject the device safely, enter these commands:

pushd /Volumes/GARMIN/
rm -rf .Spotlight-V100 .Trashes ._.Trashes .fseventsd
popd
disktool -e disk1

Your device might not be called /Volumes/GARMIN/, so check and change appropriately. If you have multiple drives on your machine, your GPS is probably not the disk1 device. You can find out which it is by entering disktool -l.

probably wouldn’t recommend the Blackberry Tour as a GPS logger

I walked a local footpath carrying my (mostly) trusty Garmin GPSMap 60Csx, and a Blackberry Tour running bbTracker. Both had had a good satellite fix for about 10 minutes beforehand, and both were logging trackpoints every second. The smooth turquoise track from the Garmin is much more useful than the wibbly one from the Blackberry.

fallout from last night’s OSM 6th birthday Mappy Hour in Toronto

It was fun – there were geo-aware cupcakes!

In a moment of geek worlds colliding, Emma showed up, and now I have people clamouring for tablet at Mappy Hour. Sigh, those old ecommons links just don’t fade …

My Neighbourhood, Canada Day 2010

I went for a bike ride on Canada Day. Click on a bicycle icon to see what I saw.