The Bruneau River runs through a narrow canyon cut into ancient
lava flows in southwestern Idaho. The canyonup to 4000 feet
(1220 meters) deep and 40 miles (64 km) long features
rapids and hot springs, making it a popular whitewater trip.
This true-color image was acquired by the Advanced Land Imager (ALI) aboard NASA's
Earth Observing-1 satellite. The 10-meter-per-pixel resolution shows details like
individual rapids at the bottom of the canyon. The ALI is similar to Landsat 7's Enhanced
Thematic Mapper plus (ETM+) and Terra's Advanced Spaceborne Thermal Emission
and Reflection Radiometer (ASTER) sensors in terms of the resolution of their data as well as their research applications. The three spacecraft fly in formation, allowing their sensors to complement each other.
The ALI collects data in nine wavelengths ranging from visible light to
shortwave infrared at 30 meters per pixel, with an additional panchromatic
band (which detects light across the visible spectrum) with a resolution of
10 meters per pixel. The ALI sensor is an experiment designed to test new
technologies that will reduce the size and cost of future Earth science
missions. In addition, scientists will use the data collected by the ALI to study the ways humans manage land resources as well as the changes across landscapes caused by urbanization, fire, and other processes.
This natural-color image of Hells Canyon was captured by NASA’s Landsat-7 satellite on September 19, 2002. The image shows the northern part of the canyon, where the Imnaha River joins the Snake River.