Comparing day to day changes using Arctic satellite images is quite a complicated task. The files are huge, two displays are indispensable and synchronization of zoom level, latitude and longitude a pain. So here at arctic.io the - eventually - first synchronized double-zoom viewer was launched today.
Basically it appears as two zoom windows side by side. There are even two mouse pointers: The white one is yours and the red one points automatically to the same location within the other zoom window. All usual functions are still working. Try out right click to save images, mouse wheel to zoom out or in and click to focus.
If you are unsure, what to do with the permalink, just click on it after the animation disappeared. Two things will happen with your browser: The address bar changes into a new URL representing current view, ready to get copied into a forum post or email. And a new entry was saved in the history, so the back and forward buttons let you switch easily between regions of interest.
The series starts with two full Arctic mosaics, dated 2012-08-07 (left side) and 2012-08-08, which is an interesting start and allows to see the cyclone fading out. If time allows I'll put up a new zoom every (other) day or so until end of melting season and publish the link to the double-zoom below this post. If you ran into problems - the comment section got recently a face lift, give it a try.
To get comfortable with the interface it is good idea to start close to the ground in a cloud free region, check out Greedland's fjords with this link.
Have fun, the Arctic is the fastest changing place on this planet these days. There is a lot to explore.So here you go:
2012-08-07 (left) vs. 2012-08-08 (right) - features phytoplankton bloom in the Barents Sea