November 3rd, 2010 by Robert Simmon
In the process of researching captions I can run into some amazing stuff, like this photo (taken yesterday) of incandescent rocks arcing through the sky during the collapse of a lava bench near Kilauea:
© Leigh Hilbert Photography 2010.
The USGS explains: “lava can instantly transform seawater to steam, causing explosions that blasts hot rocks, water, and molten lava fragments into the air.” No kidding.
Leigh’s site, Hawaiian Lava Daily, has some of the best photos of Hawaii’s active lava flows I’ve ever seen. He also pointed me to this description and photo essay of the last moments of Gary Sleik’s house in Kapana Gardens—destroyed by lava in July—as well as a recent “wake” for the house. An intimate look at events that can appear quite impersonal from space.
October 15th, 2010 by Robert Simmon
Strong convection created these “hot towers” near the eye of Tropical Storm Danielle.
Astronaut photograph ISS024-E-12954, taken August 30, 2010.
October 5th, 2010 by Robert Simmon
I found these while researching the caption for a satellite image of lava flowing into the ocean on Hawaii’s Big Island. Large versions (and more photos) on the USGS Kilauea Images site.
Glowing lava visible through a skylight on the Pulama pali (steep hill/cliff), Hawaii.
Exploding lava at the Puhi-o-Kalaikini ocean entry.
October 1st, 2010 by Robert Simmon
September 27th, 2010 by Robert Simmon
In the comments to my Natural Earth post Jim Meyer suggested I make copies of the global maps centered on the Poles. Rather than just making a few images I’ll mention G.Projector: the simplest map projection conversion software I know of. Developed by NASA Goddard Institute of Space Studies, it features 93 map projections, (assuming I didn’t lose count) decent customization options, and a good coastline database at multiple resolutions. Even better, it’s free.
The conversion process is straightforward: import an image in the equirectangualr map projection, pick a new projection, set options for coastlines and other overlays, then export. Very, very, simple (in contrast to many other remapping applications which seem to be written for people with GIS degrees). Here’s some examples:
North Pole, Orthographic Projection
North Pole, stereographic projection to 45° North.
South Pole, stereographic projection to 60° South.
August 20th, 2010 by Robert Simmon
We sort through a lot of imagery at the Earth Observatory, and not all of it makes it onto the site. A picture might be cloudy, we might not be able to tell a good story about it, it’s not quite relevant, the quality might not be good enough, or—as in this case—we might find something after it’s no longer newsworthy. These three satellite images show oil slicks on the Gulf of Mexico after the Deepwater Horizon drilling rig explosion. All are from Landsat-5 in May and July. I found them earlier this month while looking for image ideas. (Click for large images.)
Oil sheen, July 12, 2010.
Thick oil, May 25, 2010.
Oil sheen, May 9, 2010