Tag Archives: ogr
geocoder.ca’s excellent database
geocoder.ca provides a crowdsourced postal code geocoder under the ODbL. You can download the database as CSV directly. Here’s a bash script to convert that text file into a (very large) point shapefile: Though the script is a bit Unix-centric, … Continue reading
Not really getting the Azimuthal Equidistant projection right
All I really wanted to do is make a map like this: This is an Azimuthal Equidistant projection, with me at the centre (of course) and the rest of the world spread out in a fan by distance and bearing. … Continue reading
current tools of my trade
Mark asked: What kind of GIS software are you using? Well, since you asked:- SpatiaLite: spatial awesome built on SQLite. I love it because I don’t need to play DBA. QGIS: for maps ogr: for file format futzing proj: for … Continue reading
using CSV as a virtual data source
While we already know how to make trivial shapefiles with shapelib, sometimes that’s too tedious. Very frequently I get data in Comma Separated Value (CSV) format, and reliably importing/converting it can be a pain. Here’s our sample CSV file, library_test.csv: … Continue reading
tale of two cities: coordinate reference systems, and what on earth is the maywood tot lot?
For reasons that are not particularly clear, the Toronto.ca|Open data is in two different coordinate reference systems (CRS), MTM 3 Degree Zone 10, NAD27 (EPSG 2019) and UTM 6 Degree Zone 17N NAD27 (EPSG 26717). This confuses QGIS even if … Continue reading