Every month on Earth Matters, we offer a puzzling satellite image and ask you to tell us what part of the world we are looking at, when the image was acquired, what the image shows, and why the scene is interesting.
However, this March we have a special challenge with a seasonal theme (at least in the Northern Hemisphere, where spring has sprung). Join us for a remote-sensing-themed egg hunt. And by “eggs,” we mean colorful, oval-shaped lakes and ponds somewhat like those pictured above.
The first part of the challenge is to guess the location of the lakes in the image above, just like we do with our puzzler images most months. The second part is to find other colorful egg-like lakes that you think we’ll like.
When you find a good candidate, send us a screenshot and the latitude and longitude of the lake by submitting it as a comment on this blog post. We will include the most interesting lakes sent in by readers in a special image gallery that we will publish later this spring.
Some other guidance and suggestions:
+Search tools. You can use any tools you like to search for colorful lakes. Google Maps, Worldview, Visible Earth, the Earth Observatory archives, and the Gateway to Astronaut Photography may be useful.
+Make sure your lakes are reasonably large. We’ll be using Landsat (30 meters per pixel) or MODIS (250 meters per pixel) data to make the final images. If you have to zoom all the way in on Goggle Maps to see your lake, you are viewing commercial satellite imagery that has a resolution of a few meters per pixels or less. Lakes should have diameters of at least a few hundred meters to show up well in Landsat imagery.
+The more unusual the color, the better. Submitting a lake with a “normal” color is fine, but it will have a smaller chance of making the cut for our final gallery.
+Earth, please. Our focus will be on lakes on Earth. You are more than welcome to share egg-like features you spot on other planets with us, but they won’t make our final gallery.
+It’s a #SpaceEggHunt. Tag your social media posts about this with #SpaceEggHunt. In addition to the blog, we’ll monitor that hashtag for submissions.
+Explain the color. Tell us why you think the lake has such an unusual color as part of your comment. While part of the goal here is to have fun and hunt for lake eggs to celebrate spring, the final gallery will delve more deeply into the science behind lake color and how that can be useful for scientists.
+The prize. We can’t offer prize money, but, we can promise you credit and glory (well, maybe just credit). Roughly one week after a puzzler image appears on this blog, we will post an annotated and captioned version as our Image of the Day. If you find makes the final gallery, your name will be mentioned.
Good luck and happy hunting!