A friend was using GDAL’s ogr2ogr command to import some data to PostGIS recently, and as part of the import they were doing a reprojection of the data. They got the following error: PROJ: Cannot open https://cdn.proj.org/uk_os_OSTN15_NTv2_OSGBtoETRS.tif: schannel: the certificate or certificate chain is based on an untrusted root They’ve had various SSL errors on […]
For months now I’ve been collecting a load of links saying that I’ll get round to blogging them "soon". Well, I’m currently babysitting for a friend’s daughter (who is sleeping peacefully upstairs), so I’ve finally found time to write them up. So, here are a load of links – a lot of them are geospatial- […]
Last week I released version 1.9.0 of Py6S – my Python interface to the 6S radiative transfer model. It’s been the first non-bugfix release for quite a while (mainly because I’ve been busy with paid work), and so I just wanted to highlight a few aspects of the release. The full release notes are available […]
Just a quick post today, to tell you about a couple of simple zsh functions that I find handy as a Python programmer. First, pyimp – a very simple function that tries to import a module in Python and displays the output. If there is no output then the import succeeded, otherwise you’ll see the […]
During the Nepal earthquake response project I worked on, we were gradually getting access to historical mobile phone data for use in our analyses. I wanted to keep track of which days of data we had got access to, and which ones we were still waiting for. I wrote a simple script to print out […]
I really enjoy reading blogs. That seems to be a slightly outdated view, as many people have moved over to using Twitter exclusively, but I like being able to follow everything that a specific person writes, and seeing mostly long-form articles rather than off-the-cuff comments. Back in the day, when blogs were really popular, every […]
This is just a very brief reminder about something you might run into when you’re trying to get your code to work on multiple platforms – in this case, OS X, Linux and Windows. Basically: file names/paths are case-sensitive on Linux, but not on OS X or Windows. Therefore, you could have some Python code […]
At the end of my last post I left you with a taster of what Part 2 would provide: a way of producing automatically-updating graphs of power usage over time. Part 1 was based purely on Python code that would run on any system (Windows, Linux or OS X) but this part will require a […]
After borrowing a CurrentCost electricity usage meter from my local library (if you’re in the area, then Eastleigh library will loan you one for free!), I decided to buy one, as I’d found it very useful in trying to reduce my electricity usage. The benefit of buying one as opposed to borrowing one was that […]
This is really just a quick note for me in the future, and for anyone else who might find this useful. I have been involved in doing some administration of a Linux server recently – although I haven’t had full control over the server as administrators from the company that own the server have been […]