NASA Commentator Dan Huot talks with David Hornyak, the project manager of the High Definition Earth Viewing experiment, about the first year of the project’s operation and screens some of its memorable scenes. From a perch on the nadir side of the International Space Station’s Columbus module, HDEV’s four high definition off-the-shelf video cameras have been transmitting clear, sharp views of Earth from an altitude of 250 miles, providing impressive views while testing how the hardware holds up in the harsh environment of Earth orbit.
"More than a billion people around the world subsist on a dollar a day, or less. The reasons differ but the day-to-day hardship of their lives are very similar. A book by Thomas A Nazario, founder of the International Organisation, documents the circumstances of those living in extreme poverty across the globe, accompanied by photographs from Pulitzer prizewinner Renée C Byer. Living On A Dollar a Day is published by Quantuck Lane."
"It's difficult to comprehend the ridiculous amounts of water that have fallen in such a short time in a state that, until recently, had been in the grip of a historic drought. But one place to start would be to look at reservoir levels in the state. In the past 30 days, Texas reservoirs have gone from being 73 percent full to 82 percent full, according to data maintained by the Texas Water Development board. All told, about 8 million acre-feet of water have flowed into the state's reservoirs."
A map projection is used to portray all or part of the round Earth on a flat surface. This cannot be done without some distortion. Every projection has its own set of advantages and disadvantages. There is no "best" projection. The mapmaker must select the one best suited to the needs, reducing distortion of the most important features. Mapmakers and mathematicians have devised almost limitless ways to project the image of the globe onto paper. Scientists at the U. S. Geological Survey have designed projections for their specific needs—such as the Space Oblique Mercator, which allows mapping from satellites with little or no distortion. This document gives the key properties, characteristics, and preferred uses of many historically important projections and of those frequently used by mapmakers today.
"Just as you shouldn’t trust everything you read or see on television, you should never blindly trust information just because it is on a map. All maps posit arguments. Maps present information about how something is. All maps posit arguments. Maps present information about how something is. Just as there are no unbiased arguments, there are no unbiased maps."
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