Practical guide for color correction of satellite images

Posted to Design  |  Tags: ,  |  Nathan Yau

Robert Simmon provides a hands-on guide to get true color from satellite imagery. The atmosphere makes it a little tricky:

The atmosphere scatters light from the sun before it hits the ground (or a cloud, but we don’t care about those at the moment), and then scatters reflected light again on its way back to a sensor. The atmosphere even scatters light back into a camera that didn’t hit anything on the ground at all.

That would be challenging enough, but the atmosphere changes from one place to another (the air above deserts is typically dry, while the air above a forest is usually moist (even when not cloudy) and often filled with tiny aerosol droplets), and over time (a hazy summer day compared to a crisp fall evening).

Favorites

Life expectancy changes

The data goes back to 1960 and up to the most current estimates for 2009. Each line represents a country.

Interactive: When Do Americans Leave For Work?

We don’t all start our work days at the same time, despite what morning rush hour might have you think.

Years You Have Left to Live, Probably

The individual data points of life are much less predictable than the average. Here’s a simulation that shows you how much time is left on the clock.

How to Spot Visualization Lies

Many charts don’t tell the truth. This is a simple guide to spotting them.