Category Archives: GIS
image georeferencing with QGIS
Quantum GIS (QGIS) has a very powerful image georeferencing module. What that allows you to do is convert screen pixels to a map of an area. The pixels could be from a scanned map or from a screen image. Scanned … Continue reading
Garmin vs Arduino GPS dance-off
So I built a GPS logger. It’s an Arduino Uno with the SparkFun microSD and GPS shields. No display, massively unwieldy, but it does spit out a track point every second and logs it fairly reliably to microSD. It works … Continue reading
fixing garmin file dates
While the Garmin GPSMap 60csx is a lovely unit, it saves its tracks on the card with a date just slightly younger than I am. The following Unix one-liner will correct the file dates to the actual dates the data … Continue reading
The SpatiaLite Cookbook
Alessandro‘s new SpatiaLite Cookbook is rather good. Alessandro’s new SpatiaLite Cookbook is rather good.
Interfacing the Pharos GPS-500 to Mac OS X
I’m stopping short of calling this “Using the Pharos GPS-500 to Mac OS X” because all I’ve been able to do is read raw NMEA sentences from the device. But that might be of use to you. The Source is … Continue reading
Magellan Triton 400 micro-review
My office’s Garmin was stuck in a branch office last week, and we needed a GPS for the next morning, so we got a cheapo Magellan Triton 400 for $90 at Future Shop. I think that’s a clearance price, and … Continue reading
Got a receiver inside my head – writing Spectrum Direct data as CSV
Industry Canada publishes the locations of all licensed radio spectrum users on Spectrum Direct. You can find all the transmitters/receivers near you by using its Geographical Area Search. And there are a lot near me: While Spectrum Direct’s a great … Continue reading
making of the Canada Day post
Making the My Neighbourhood, Canada Day 2010 post took a bit of planning. Hardware I attached an Ultrapod to the stem of my bike, and added another velcro wrap for security. The GPSMAP 60CSx fitted quite nicely under the bungees … Continue reading
proj.4 init annoyances: it’s all apple’s fault
I was going to write a rant about how Ubuntu sets up proj.4 init files incorrectly, then I found that the problem actually lies with OS X. OS X is unusual for a Unix variant, as it uses a case-insensitive … Continue reading
in which I discover OpenStreetMap editing
While I’ve used OpenStreetMap data before, I’ve never added anything to it. That changed after going to Mappy Hour last night, and meeting Richard Weait. He has a bunch of useful tutorials on his website. While I’ve used OpenStreetMap data … Continue reading