Taking orthophotos on Kvaløya May 15 2023

That’s me, nine days ago, near a parking place by the lake Finnvikvatnet on the island Kvaløya.

I just got a drone from the Norwegian Polar Institute, a DJI Mavic Pro 2. Since it is forbidden to fly a drone in Tromsø (too near to the airport) I chose a place on Kvaløya to check out the drone and practise a bit.

What you may expect from drone flying is photos like this:

What I actually did that day was taking a bunch of photos like these:

Back at home let the computer do some heavy work. That’s the result:

What I wanted to achieve is creating a so-called orthophoto. That is a stitched image that also contains geographical information. You need quite a lot of photos to get good results. In the map above it is only 9 photos and 11 photos in two distinct groups.

I used two softwares: First OpenDroneMap to create the orthophoto and then QGIS, an open source Geographic Information System, to present the orthophoto in a geographical context.

This afternoon I took a trip to Kvaløya again, this time to the way to Sommarøya and stopped by the lake Kattfjordvatnet. Here I pulled up the drone to an altitude of 80 metres and tried to navigate a rectangular zig-zag pattern with a lot of overlapping between the images. Beside of the fact, that the images are underexposed (and I was too lazy to correct them) I’m quite content with the result. The first image is an oblique shot, the second image is an orthophoto calculated from about 80 images and then placed into QGIS.

Today’s orthophoto from the eastern part of Kattfjordvatnet

Plan for the next two weeks: getting more practise!

Arctic preparations Apr 29 2023

Have a look at these two images. They have something in common.

Both are related to my participation in the Arctic Ocean cruise in June. After the Nansen legacy cruise last year this will be my second scientific cruise to the Arctic with the Norwegian Polar Institute. And this time I’ve got extra tasks.

1. Drone flying

A scientist asked if I could fly a drone to map the ice stations. I didn’t have any experience in drone flying so I bought a private one to practise some weeks ago. In addition to that I made the Norwegian online course in drones (class A1 and A3) and the exam. Now I’m registered as a drone pilot in Norway, both in private and for the Norwegian Polar Institute. That was the easy part.

The interesting part starts when I shall take photos with latitude and longitude information from a drifting ice floe. But I’m not there yet (and quite happy that I have another month of preparation).

The drone photo above was taken in Norway. In Sweden it is a lot of paperwork to get permission for the publication of photos, especially when they show the sea as well. In Norway this is not the case, as long as you know the legal rules and restrictions.

2. Ice chart and weather info

To help both the cruise leader and the crew with planning it will be my job to provide them with current information. That’s ice charts coming from a SAR satellite and weather forecasts for e.g. wind, temperature and pressure. The data will be presented using the Open Source Geographic Information System QGIS. The screenshot above is just from a small learning session where I loaded in quite unrelated data as a topographical map of Svalbard, an ice chart from two days ago and current wind information.

The interesting thing will begin when we head north, leaving Svalbard behind. Then we do not have internet access anymore except sending and receiving emails through the slow and expensive Iridium network. So I cannot use all the cool QGIS plugins to gather data directly but I’ll have to send data requests per email and then receive the data later. This will be both interesting and challenging. I’m somewhere in the middle of being quite excited and pretty nervous.

Anyhow I wanted to have jobs and tasks and I’m glad I get the opportunity in a more active role than last year, were I was more like an observer. I guess, I’ll learn a lot.

Arctic Ocean, soon I’ll come!

Like ice in the springtime … Apr 12 2023

In the rare cases where the temperature rises above 0 °C something special happens: Ice and snow melt and become a liquid known as „water“. One of these rare occasions is called „spring“ and this is what has started happening right now. In these days many things happen that are related to ice, snow, and water.

8 April: Vattenplasket in Malå

Last Friday Annika and I visited our friends Lasse and Martine in Kusfors and stayed over. Lasse is a journalist and had a job in Malå the next day. There was a very special ski competition named “Vattenplasket” – the water splash. A ski hill and instead of a finish line a large basin with knee deep water. Is it possible to downhill on ski or snowboard and have enough momentum to cross the water? Let’s see:

Most of the competitors failed, two actually managed it. True sportsmanship showed a small boy that did not get enough momentum with his sled and just walked into the water. Kudos!

9 April: almost a kayak tour

On Sunday Annika and I tried to do another kayak tour. Five days ago the ice was stable, this day it had got holes and was not reliable anymore. While Annika stood on safe ice I tried to cross the old ice to the island but **splash!** broke through several times. No biggie, the water is quite shallow and we have drysuits but it is exhausting. When Annika started breaking through as well, we decided to return. Another time …

Almost a kayak tour: Me in the water (Photo: Annika Kramer)

10 April: winter bath

Finally. Annika and I. Twice. And then: sitting on the rocks in the wet bathing clothes without freezing because the sun is so warm. Springtime!

Winter bath in Vitskärsudden (Photo: Annika Kramer)

12 April: ice work

This is a piece of ice seen from the side. You can see the different horizontal layers that accumulated over time.

This is however no glacier ice nor Arctic sea ice. It is a piece of ice from our way to our house. Annika and I have been chopping the ice bit by bit for many days and today was the day: the way to the car and the road is free of ice and snow.

12 April: another “almost” kayak tour

There are other parts that are free of ice: Most of the weak ice between land and the island Lillskär is gone. After work I tried to paddle around the islet. We had low water (-30 cm) and some of the stable ice was grounded while large parts of the sea were open.

The first part was easy but when I almost rounded the island I came into an ice field. I already had seen it before starting the tour and thought I could paddle through. In theory this was possible, but the wind and the layers of ice made it near to impossible to steer the kayak.

So I got off the boat, jumped into the 60 cm deep water and while standing turned the kayak back to course. Now I could continue my island circumnavigation. Anyhow I consider exiting the kayak on the tour cheating, that’s why I say: I almost circumnavigated Lillskär today.

Even though the ice floes may have been 7–8 cm thick you couldn’t stand on the ice any longer. The ice was “rotten”. Many tiny vertical channels had weakened the ice and made it sensible to vertical stress. You can see it on the next photo. The piece on ice is standing, the bottom part of the ice floe is on the left.