Data Sets for Research
Scientific Data Search
Support for Researchers
Data for Everyone
Looking for facts and information? See About the Cryosphere.
Icelights: Answers to your burning questions about ice and climate
What's hot in the news around climate and sea ice and what are scientists talking about now? Read more...
What is the Cryosphere?
When scientists talk about the cryosphere, they mean the places on Earth where water is in its solid form, frozen into ice or snow. Read more ...
The relative time axis represents two-way travel time. Two adjacent returns separated by a relative time difference (delta_t) in nanoseconds correspond to a height difference of delta_h in centimeters such that:
delta_h = c / 2 * delta_t
c is the speed of light in cm/nsec
c = (3 x 1010 cm/sec) / (1 x 109 nsec/sec)
c = 30 cm/nsec
So, a relative time difference of 1 nsec corresponds to a height difference of 15 cm.