Noctilucent Clouds 2021-06-05

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Noctilucent (“night-shining”) clouds are the highest in the atmosphere, at around 76-85km altitude. They only appear in the summer months at latitudes from 50-70º (north or south), when the sun is more than 6º below the horizon. Formed in the mesosphere at very cold temperatures from ice, dust and water vapour, their gossamer threads undulate and shimmer in shades of electric blue.

There was a particularly decent display on Friday/Saturday morning – I nipped out and spent a happy hour making the video:

Timelapse: Sony a7r3, Sigma 14-24mm lens, SkyWatcher StarAdventurer tracking mount for rotation

Stills: Fuji X-T4, 16-80 f/4 lens

A selection of the images are available as prints, masks, cards and other products (even socks and jigsaw puzzles!) from my main website: ShinyPhoto: Noctilucent Clouds

Caithness Holiday Day 2: Whaligoe Steps and Camster Cairns

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Many moons ago… the parents and I were on holiday around Caithness and having trouble finding the way to Whaligoe Steps. As his tractor turned by the end of the field, we stopped a farmer to ask directions. To southern ears, the instructions sounded memorably like “turn right at the fussky-osk”. With a little thought we established the meaning… and twenty-two years later I still remember the turn of phrase and was pleased to identify the first phone-box in this Spring’s return visit.

Whaligoe Steps themselves are 365 steps down the side of a steep cliff to a former port for offloading herring boats; women would gut the fish and carry it up in barrels.

The place itself is quite an impressive geo with a fault nearby in the rock – strata lines pushed up by thrust – and pleasant views out to sea.

Further down the road are Camster Cairns – quite impressively large piles of rocks with interior chambers, perhaps the oldest buildings in Scotland at 5000yr old.

It had been another ludicrously hot day, with temperatures up over 25-28ºC, so we finished the day’s explorations on the north coast at the Slates of Fulligoe in East Mey, where the setting sun was partially obscured by a thick sea haar – very pleasantly cool.

 

This was the second evening I’d set out to make a timelapse of the sunset into dusk. At least this time I was prepared for haar coming in off the sea (chose a safer less-cliff-top location near the path back, for starters). It did not disappoint: over the course of an hour the sun moved, the waves came and went, and a huge bank of fog moved in transforming the scene from brilliant sunset reflecting on the water, to complete white-out. All the possible moods of the landscape in barely an hour – quite awesome.
This photo is a temporal flattening of a timelapse sequence – using the intervalometer to shoot HDR brackets 3*±1EV at regular intervals which can be made either into a timelapse video or averaged-out into a still, like this. (The sun itself is blended from fewer images to avoid motion blur.)

Frame interpolation for timelapse, using Julia

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A long time ago I wrote a python utility to interpolate frames for use in timelapse. This project was timelapse.py.

Back in 2014 I ported the idea to the very-alpha-level language Julia.

In recent weeks Julia released version v1.0.0, followed shortly by compatibility fixes in the Images.jl library.

And so I’m pleased to announce that the julia implementation of my project, timelapse.jl (working simply off file mtimes without reference to exif) has also been updated to work with julia v1.0.0 and the new Images.jl API.

Usage:

zsh/scr, photos 11:32AM sunset/ % ls *
images-in/:
med-00001.png med-00022.png med-00065.png med-00085.png
med-00009.png med-00044.png med-00074.png

images-out/:

zsh/scr, photos 11:32AM sunset/ % ~/j/timelapse/timelapse.jl 50 images-in images-out
[1.536147186333474e9] - Starting
[1.536147186333673e9] - Loading modules
[1.536147201591988e9] - Sorting parameters
[1.536147201648837e9] - Reading images from directory [images-in]
[1.536147202022173e9] - Interpolating 50 frames
[1.53614720592181e9] - frame 1 / 50 left=1, right=2, prop=0.11999988555908203
[1.536147217019145e9] - saving images-out/image-00001.jpg
[1.536147218068828e9] - frame 2 / 50 left=1, right=2, prop=0.24000000953674316
[1.536147222013697e9] - saving images-out/image-00002.jpg
[1.536147222819911e9] - frame 3 / 50 left=1, right=2, prop=0.3599998950958252
[1.536147226688287e9] - saving images-out/image-00003.jpg

...

[1.536147597050891e9] - saving images-out/image-00048.jpg
[1.53614761140285e9] - frame 49 / 50 left=6, right=7, prop=0.880000114440918
[1.536147615090572e9] - saving images-out/image-00049.jpg
[1.536147615649168e9] - frame 50 / 50 left=6, right=7, prop=1.0
[1.536147619363807e9] - saving images-out/image-00050.jpg
[1.536147619960565e9] - All done
zsh/scr, photos 11:40AM sunset/ %

zsh/scr, photos 11:51AM sunset/ % ffmpeg -i images-out/image-%05d.jpg -qscale 0 -r 50 sunset-timelapse.mp4
ffmpeg version 3.4.2-2+b1 Copyright (c) 2000-2018 the FFmpeg developers

...

zsh/scr, photos 11:51AM sunset/ % ll -h sunset-timelapse.mp4
-rw------- 1 tim tim 4.9M Sep 5 11:46 sunset-timelapse.mp4

Autumn at Glen Affric (2)

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Having visited my favoured spot overlooking the Caledonian Forest, I proceeded up the side of Am Meallan to the well-known location with a view over the lodge and along the length of Loch Affric.

It’s definitely an autumn morning location: the sun rises behind you, skimming up and over the tops of mountains beyond Loch Beinn a’Mheadhoinn, rising as it heads south; accordingly, patches of bright sunlight interspersed with cloud-shadows lap like waves across the undulating landscape from distance right over you.

Of course I had to make a timelapse video of it:

Loch Affric timelapse 2017-10-14 from Tim Haynes on Vimeo.

And two more photos to summarize the morning:

Sunlight and cloud shadow – an outcrop of Scots Pine and birch trees on Sgurr na Lapaich

Proper colours. The most beautiful shade of green pine foliage interspersed with orange/yellow warm birch trees, all lapping up the early morning light.

A classic view – soft heather and bracken leading past Loch Affric to the mountains beyond (Kintail / Glen Sheil in the very far distance).
I had befriended a fellow photographer down at the glen earlier; the first I knew that they had followed me a few minutes later up to this memorial viewpoint was the word “WOW!” exclaimed a few feet behind me.

Birnham Hill

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One of my favourite views is the Highland Boundary Fault running through the landscape, immediately in front of me standing at Stair Bridge Viewpoint part-way up Birnam Hill.

It looks particularly pleasant with light and cloud-shadows zipping over the trees too:

The Dumpling

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Just to the south of Loch Lomond beside the village of Gatocharn lies Duncryne Hill – a positively cute protrusion consisting of sandstone and conglomerate from the Emsian era early in the Devonian Period, affectionately known as The Dumpling.

Having discovered it on Google Earth, thinking it might afford good views over Loch Lomond and the Highlands to the north, I visited it this past weekend.

I wasn’t disappointed.

Approaching The Dumpling

Some artwork – looking at Loch Lomond from the top of Duncryne Hill:

The Highland Boundary Fault runs from Arran to the south-west, cutting through Loch Lomond between Arden (west) to Balmaha (east), forming a clear escarpment along the side of Conic Hill.

 

The Highland Boundary Fault runs right through the middle of this photo – through Loch Lomond around Balmaha, causing the rising mountains to the right of the scene.

The clouds were fairly zipping along, obscuring and bathing the landscape in crepuscular rays, so I had to make a short timelapse video of the vista:

With such light and rain-clouds passing by, on returning to the top of the hill I was greeted by a dramatic full-on rainbow with complete primary and secondary bows and supernumaries glowing in super-saturated vibrant arcs over the trig-point.

And just to finish the day’s expedition, there was some beautiful early golden-hour evening sunlight back-lighting a group of trees outside Drymen.

A Day In Clouds

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That was 2017-06-20, that was. A beautiful blue sky with white fluffy wispy cirrus cloud catching the setting sun…

…followed by a noctilucent cloud display around 1am:

NLCs are the highest-flying clouds, occurring at altitudes up to 80km where the next highest type (cumulonimbus) only reaches 12km and most are lower still. Most typically they resemble a fine silver filigree of ice-cold pale blue, although more complex forms have been seen. First maybe-seen in 1885, they only really came to prominence since the 1980s, as a canary for changes in the upper atmosphere linked to climate change.

As I stood and watched the display, a patch of silver mist formed over Strathearn and made its way west along the A85 toward Crieff, so I made a little timelapse video – 17 minutes’ data compressed into 1:

Autumn Holiday 2016: Heading Home

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Having spent a few days based in my favourite Glen Affric hunting scenery up in the far North, I drove back down Loch Ness. Thinking to take a detour along the A827 (toward Skye), I joined the A87 south only to be met with road-closed signs.

There was a bit of light in the layby while I made my mind up…

The view from the layby also included a classic interaction of mankind and nature – rarely, for me, this is highly manipulated (several partial wind-turbines removed and the remaining one moved across the frame and inverted) but illustrates the concept and contrast quite nicely:

“Speaking to the Sky”
Originally a photo of a few large wind turbines on the slopes of Meall Dubh; made into a bit of a statement.

Given that the first detour was closed, I went a little further along to Loch Cluanie on the road to Skye and had a quick play with the new Nisi filters[amazon], admiring the sunlight on the loch shore:

Perhaps not the best light for landscape work, being late morning / nearly noon, but quite nice and bright sunlight on Loch Cluanie nonetheless.

A rather late lunch was had at my favourite pub in Glencoe, the Clachaig Inn.

The weather turned foul as we travelled through Glencoe, but it made for an interesting timelapse video of the clouds and mist lapping around two of the Three Sisters mountains (Beinn Fhada and Gearr Aonach):

And this is what it looked like shooting it… complete with chamois leather cloth to keep the rain off the camera:

[sphere 3061]

Sunset Timelapse

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Further experiments making timelapse videos – this time the sunset looking across Strathearn to Crieff – from my favourite spot for hunting aurora.

The second has Ursa Major emerging, one star at a time, over the course of 50 minutes around midnight.

Both were taken using the Olympus Pen-F with its built-in intervalometer – the first with the 12-60mm f/2.8 PRO (four-thirds) lens, the second with the 7-14mm f/2.8 PRO (micro-four-thirds) lens – but the RAW ORF files were reprocessed using RawTherapee for better tone control, the results interpolated to generate 1500 frames (1 minute at 25fps) using a custom Julia script and merged with ffmpeg.

The audio is a minute of the T-in-the-Park festival recorded from a mile away with vocals added by sheep in nearby fields. A quick frequency analysis in Audacity shows the thumping bass peaks at around 58Hz (A1)…

T-in-the-Park festival from a mile away - frequencies peaking at 58Hz

T-in-the-Park festival from a mile away – frequencies peaking at 58Hz

Edinburgh Fog

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On Sunday, on a whim, I went down to Edinburgh. As always, the city was fairly heaving but I revisited one of my favourite locations – the Radical Road along the Salisbury Crags, which affords an excellent view from Blackford Hill round to the Parliament buildings.

So I tested the Pen-F’s timelapse video ability for the first time. The camera makes it a breeze: set up the scene (lots of filters to cope with the lighting), set it in aperture-priority mode, 300 frames at 5s intervals, push the button and off it goes. And nature provided! – simply point the camera at the city and watch the sea haar roll in, great low clouds of misty fog, obscuring the castle within minutes.

First time I’ve made a 4K video… unfortunately the results from the camera weren’t quite up to the quality I expected, so I reprocessed all the RAW ORF files on the notebook in bulk (using RawTherapee) and rendered the official video myself with ffmpeg.

I also made a wide panorama – 5 frames each in 80-megapixel high resolution mode; lots of image data, nicely stitched in Hugin as usual.

Announcing Timelapse.jl – frame interpolation for timelapse photography

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A few years ago I wrote a python utility for interpolating a greater number of frames from a smaller set, for use in timelapse video/photography.

Recently, I’ve been trying to learn Julia. As a small challenge – to fulfil a potential forthcoming need – and because it claimed to be quite a fast language – I’ve rewritten the core of the script.

It’s quite refreshing – none of the gratuitous OO classes I had to create with Python, just a couple of functions to do the essential interpolation. And watching the output frames flash by… it’s pretty nippy, too.

It doesn’t yet support EXIF directly, nor can it modify images directly on the fly, but if you want to have a play then go download it from Github: https://github.com/spodzone/Timelapse.jl