Alasdair Rae Profile picture
Dec 28, 2021 15 tweets 7 min read Read on X
A long blog post in which I:

- explain how to turn a sequence of images (maps, but could be anything) into a video, as in the example here

- give away all sorts of trade secrets

- share some image sets to play with

- provide lots of example commands

statsmapsnpix.com/2021/12/map-an…
I cover installation of #ffmpeg on Mac (easy), Linux (easy) and Windows (easy, but can seem horrendously complex for new users) and ...
I also try to break things down into chunks so that they make sense to the new user - and then you can have all sorts of fun with animating the map files I provided
I've shared image sets for

- LHR to JFK flight
- LHR to Rome flight
- A9 road animation (shown here)
- Highland contours
- UK population density scanner thingy
- US contours

I made all these in QGIS Atlas, but you can make individual frames many ways
I've shared the individual frames from this UK population density video as well, so if you are keen to try it you can play around with it and have fun and live a happy life
I also show you how to convert a video file (such as an mp4) to a gif - that doesn't look like it's been roughed up by a gang of pixelmonsters
but if you just want to know how to convert a .mov file to a .mp4 file, that's covered too
if you want to make your own map frames - like the ones I've shown here - then you can do that in QGIS, by following my tutorial booklet

automaticknowledge.org/training/workb…

(works on Mac, Linux and Windows)
oh, and I've also added instructions on how to add a sound file to your video (like in the one here and in the first video)
anyone who uses Google Earth Studio may also find it useful, or any other software or tool that spits out a series of images - e.g. I used it to patch together this 'places I have lived' image series from Google Earth Studio
you won't always be able to see things super-clearly on videos on twitter (I find it's normally better on mobile than on desktop) so the little 'convert to gif' snippet in the blog is useful for when you need that
this is all part of my sneaky plan to lure you in, if you're thinking of dabbling with this kind of thing but not sure where to begin - some low stakes fun is sometimes a good entry point

statsmapsnpix.com/2021/12/map-an…
(and if anyone who is good at maths or math can calculate the speed of the plane in the first tweet that'd be great)
all this stuff can be useful for visual storytelling in all kinds of ways - here we can see a familiar form emerging from the darkness (I've shared these frames too)
will end this thread by adding in the #ffmpeg hashtag so that I can find it again more easily, and by saying that I'll leave this little text file of commands online in the web folder (linked to in the blog) for anyone to use

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More from @undertheraedar

Apr 4
I saw this Met Office 'UK climate districts map' online so naturally I decided to try and figure out the population of each area whilst eating my lunch and these are the incredibly interesting results
Image
Image
there is also the Met Office "climate regions" map but that's a can of worms that I don't want to open, not least because of the unwavering England N / England S line

metoffice.gov.uk/research/clima…
Image
when you plonk the Met Office climate districts on top of a map then you get something like this Image
Read 10 tweets
Feb 6, 2023
Okay, some European population density stuff now - starting with the top 100 1km grid squares by population across Europe, based on the most recent Eurostat data - more to follow
these are the top 3 by density, but I've shared a web folder with all 1km grid squares with more than 30,000 people living in them, as well as the top square in each of the 38 countries in the dataset

drive.google.com/drive/folders/…
they're all really interesting to me, but I particularly liked Gijón, Bucharest and Valletta
Read 35 tweets
Jan 13, 2023
Topical retweet because I've been watching The Rig but also the news - I remember first seeing these when I was about 10 when playing football in Invergordon and we couldn't believe the size of them
if you want to get a sense of the scale, look at the size of the people cutting up this old rig in Invergordon last summer
the Cromarty Harbour folk have done some nice street view imagery of the firth, e.g.

google.com/maps/@57.68775…
Read 4 tweets
Jan 13, 2023
Another very interesting recent England and Wales Census 2021 release is the passport data, so here's a map of % with no passport at MSOA level, will add a couple more below
these are all the different columns in the dataset (TS005Passports held) and the patterns are quite interesting, although I've only done a few maps as a way to explore the data

nomisweb.co.uk/sources/census…
the % with Irish passport map looks like this - probably about what I'd have expected
Read 11 tweets
Jan 6, 2023
Today's census map shows the most common housing tenure in each local authority in England and Wales 🏡
I'm working on my spelling of mortgage, probably due to the shock of seeing how many households own without a mortgage!
most common by area is of course a very first-past-the-posty representation of things but I'm interested in the pattern precisely because of this - will fix typo later, perhaps I should do by constituency too
Read 11 tweets
Jan 5, 2023
More Census age data today - a little animation of % by single year of age in each local authority. Probably needs a few watches to sink in - lots in here - but the final 10 seconds I find quite sombre, and you'll NEVER guess when lots of people leave home
and, just to go all dataviz retro, here are all the frames as small multiples
nerd note: lots of ways to make small multiples from image sets but I tend to use ImageMagick, and the image above was created using this command:

montage *.png -tile 10x10 -geometry +5+5 age-by-year.png

Once you have a set of files it only takes a few seconds to run
Read 4 tweets

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