PIA02853: Upolu Island, Western Samoa
Target Name: Earth
Is a satellite of: Sol (our sun)
Mission: Airborne Synthetic Aperture Radar (AIRSAR)
Spacecraft: NASA DC-8 Aircraft
Instrument: AirSAR
Product Size: 1992 x 2018 pixels (width x height)
Produced By: JPL
Primary Data Set: AIRSAR
Full-Res TIFF: PIA02853.tif (3.49 MB)
Full-Res JPEG: PIA02853.jpg (1.528 MB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

Island nations in the South Pacific Ocean experience natural disasters associated with typhoons, and with their proximity to the Pacific Ocean's "Ring of Fire." This radar image shows the western end of the island of Upolu in the nation of Western Samoa. Disaster managers use digital elevation models (DEMs) generated from radar data to assist in research toward disaster mitigation and management. Geologists also use DEM data of volcanic features, such as the circular craters in this image, to study eruption rates and volumes, and volcanic landform evolution.

Black areas near the top of the image are areas where steep topography causes holes in the data; these holes can be filled in by collecting data at other look directions. Color represents topography and intensity represents across-section of the radar backscatter. Since rough areas return more of the incident signal, they appear brighter on the image than relatively smooth areas, such as the ocean surface at the top of the image.

This image was acquired by the AIRborne Synthetic Aperture (AIRSAR) radar instrument aboard a DC-8 aircraft operated out of NASA's Dryden Flight Research Center. AIRSAR collects fully polarimetric data at three wavelengths; C-band (0.057 meter), L-band (0.25 meter) and P-band (0.68 meter). AIRSAR also collects cross-track and along track interferometric data that results in topographic measurements and motion detection, respectively.

This image was collected during the Pacific Rim mission, a three-month mission from July to October 2000 that collected data at over 200 sites in eighteen countries and territories around the Pacific Rim. AIRSAR is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Earth Science Enterprise,Washington, D.C.

Size: 10 km (6.2 miles) x 10 km (6.2 miles)
Location: 14.02 deg. North lat., 171.52 deg. West
Orientation: North at top
Date Acquired: August 10, 2000

Image Credit:
NASA/JPL

Image Addition Date:
2000-12-11