September 6, 2017
by chris
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I wrote about the problem of positional accuracy of satellite images before on several occasions. Working with images from the Arctic for the update of the Franz Josef Land map again i realized a few things i wanted to share … Continue reading
September 2, 2017
by chris
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I have updated the Franz Josef Land map with new data based on mostly 2016 Sentinel-2 imagery and also using a relief rendering primarily based on ArcticDEM data as a test case for the new data set. Franz Josef Land … Continue reading
April 10, 2017
by chris
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To illustrate the difficulties of assembling cloud free satellite image mosaics i tend to use the analogy of trying to photograph an elephant running through a dense forest at a distance and changing its color like a chameleon while doing … Continue reading
September 24, 2016
by chris
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Just put up a few additions to the OSM images for mapping: A number of aerial images from about a year ago from Operation Icebridge overflights of the Thule Airbase (where most of these flights are conducted from). In contrast … Continue reading
April 9, 2016
by chris
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Last year i showed a spring Landsat mosaic of Franz Josef Land – here is something similar for Severnaya Zemlya created from this year imagery from almost exactly the same time in late March and early April. The situation is … Continue reading
February 15, 2016
by chris
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Ongoing volcanic eruptions are often well visible on satellite images due to the clouds of ash and steam emitted by the eruption. In Kamchatka during winter you can also usually well identify recently active volcanoes even after the eruption ended … Continue reading
January 1, 2016
by chris
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The map of Franz Josef Land got an update with new map data and a new satellite image mosaic fully based on Landsat-8-data and produced to the standards previously shown in the Greenland and Svalbard images. The mapping is updated … Continue reading
August 19, 2015
by chris
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After producing the Franz Josef Land map and the Severnaya Zemlya map i have now completed another similar map of the third large group of islands in the Russian Arctic: Novaya Zemlya. Novaya Zemlya is located south of Franz Josef … Continue reading
August 3, 2015
by chris
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Last week we had a few days of extraordinarily sunny weather in large parts of the Eurasian Arctic – see here for an overall view. So i created a new Summer mosaic of Franz Josef Land complementing the winter view … Continue reading
May 25, 2015
by chris
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Here is a particularly interesting spring Landsat image from the Arctic showing October Revolution Island, Severnaya Zemlya. The area shown is located here: and shows two fairly spectactular phenomemena. The first is the streak of wind blown dust at the … Continue reading
April 19, 2015
by chris
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In many parts of the Arctic late winter and early spring bring the most stable good weather of all year – and best chances for cloud free satellite images. So also in late March and early April this year for … Continue reading
March 2, 2015
by chris
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I just updated renderings of the Severnaya Zemlya map with a number of changes: Relief data is now using shape-from-shading techniques on the whole map area to provide additional relief details. Quality of this is somewhat variable since availability of … Continue reading