Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991



Purchase ALOS PRISM data
Researchers can purchase data from the University of Alaska-sponsored ASF Enterprise. Data is available to researchers in the Americas who agree to the conditions of sale.

Dataset Description:

Data Products

ALOS PRISM data is available as:

  • Level 1A: Reconstructed, unprocessed signal data with radiometric- and geometric-correction coefficients appended but not applied.
  • Level 1B1: Data are radiometrically calibrated.
  • Level 1B2: Data are radiometrically calibrated and geometric-correction applied. Data can be processed either geo-referenced or geo-coded.

PRISM data was provided in CEOS format. More detailed product descriptions are available from the JAXA website.

ALOS PRISM Technical Details


Observation Band0.52-0.77 µm
Number of Optics3 (Nadir, Forward, Backward)
Scanning MethodPush Broom
Base-Height Ratio1.0 (Forward to Backward)
Spacial Resolution2.5 m (at Nadir)
Swath Width
35km (Triplet mode)
70 (Nadir only, wide-swath mode)
Pointing Angle± 1.5&deg (Triplet Mode, Cross-track direction)
Observation Mode 1Triplet observation mode using Forward, Nadir, and Backward Views. Swath width is 35km.
Observation Mode 2Nadir view with 70km swath width and Backward view with 35km swath width.
Observation Mode 7Nadir view with 35km swath width.

PRISM cannot observe areas beyond 82 degrees south and north latitude.

Read more on the JAXA website.


PRISM Panchromatic Remote-Sensing Instrument for Stereo Mapping

PRISM consists of three panchromatic telescopes for forward, nadir, and backwards viewing. The stereoscopic views will be used to create highly accurate digital elevation models, while the 2.5m resolution will permit the production of orthorectified imagery.

PRISM can provide land coverage and land-use classification maps for monitoring regional environments. In addition, the instrument has a cross track pointing capability useful for disaster monitoring.

Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.