ASF-E Project : Americas ALOS Data NodeALOS Sensors
« PALSAR
PALSAR Summary
PALSAR Phased Array L-band Synthetic Aperture Radar
PALSAR is an L-band SAR capable of detailed, all-weather, day-and-night observation, and repeat-pass interferometry.
PALSAR has multiple observation modes with variable polarization, resolution, swath width, and off-nadir angle.
PALSAR Technical Specs
| Fine Resolution | ScanSAR | Polarimetric | ||
|---|---|---|---|---|
| Center Frequency | L-Band (1.27 GHz) | |||
| Polarization | HH or W | HH+HV or VV+VH | HH or VV | HH+HV+VV+VH |
| Spatial Resolution | 10m | 20m | 100m | 30m |
| Swath Width | 70km | 70km | 250-350km | 30km |
| Off-Nadir Angle | 34.3° (default) | 27.1° (default) | 21.5° (default) | |
PALSAR cannot observe the areas beyond 87.8 degrees north latitude and 75.9 degrees south latitude when the off-nadir angle is 41.5 degrees.
Read more on the JAXA website.
PALSAR Data Products
PALSAR data were available as:
- Level 1.0: Reconstructed, unprocessed signal data with radiometric- and geometric-correction coefficients appended but not applied.
- Level 1.1: Single Look Complex products provided in slant range geometry and compressed in range and azimuth. Individual files are provided for each polarization for multi-polarization modes.
- Level 1.5: Multi-look processed images projected onto map coordinates. Data can be processed either geo-referenced or geo-coded. Individual files are provided for each polarization for multi-polarization modes.
PALSAR data are provided in CEOS format. More detailed product descriptions are available from the JAXA website
.
PALSAR Processing Information
AADN used the JAXA processor for processing of ALOS PALSAR, which was periodically updated. PALSAR processor versions formerly employed by AADN can be viewed here.
« AVNIR-2
AVNIR-2 Summary
AVNIR-2 Advanced Visible - and Near-Infrared Radiometer type 2
AVNIR-2 is a four-band (visible and near infrared) radiometer with a resolution of 10m, designed for observing
land and coastal zones. The images will provide the basis for land coverage and land-use classification maps for monitoring regional
environments. In addition, the instrument has a cross-track pointing capability useful for quick response applications including
disaster monitoring.
AVNIR-2 Technical Specs
| Observation Band | |
|---|---|
| 1:0.42-0.50 µm | |
| 2:0.52-0.60 µm | |
| 3:0.61-0.69 µm | |
| 4:0.76-0.89 µm | |
| Scanning Method | Push brooom |
| S/N | > 200 |
| MTF | > 0.2 |
| Spatial Resolution | 10m (at Nadir) |
| Swath Width | 70km (at Nadir) |
| Pointing Angle | ± 44° |
AVNIR-2 cannot observe the areas beyond 88.4 degrees north latitude and 88.5 degrees south latitude.
Read more on the JAXA website.
AVNIR-2 Data
AVNIR-2 data was available as:
- Level 1A: Reconstructed, unprocessed signal data with radiometric- and geometric-correction coefficients appended but not applied.
- Level 1B1: Data are radiometrically calibrated. Individual files are provided for each band.
- Level 1B2: Data are radiometrically calibrated and geometric-correction applied. Data can be processed either geo-referenced or geo-coded. Individual files are provided for each band.
AVNIR-2 data was provided in CEOS format. More detailed product descriptions are available from the JAXA website.
AVNIR-2 Processing Information
AADN used the JAXA processor for processing ALOS AVNIR-2 data, which is periodically updated. AVNIR-2 processor versions formerly employed by AADN can be viewed here.
« PRISM
PRISM Summary
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.
PRISM Technical Details
| Observation Band | 0.52-0.77 µm |
|---|---|
| Number of Optics | 3 (Nadir, Forward, Backward) |
| Scanning Method | Push Broom |
| Base-Height Ratio | 1.0 (Forward to Backward) |
| S/N | >70 |
| MTF | >0.2 |
| Spacial Resolution | 2.5 m (at Nadir) |
| Swath Width | |
| 35km (Triplet mode) | |
| 70 (Nadir only, wide-swath mode) | |
| Pointing Angle | ± 1.5° (Triplet Mode, Cross-track direction) |
| Observation Mode 1 | Triplet observation mode using Forward, Nadir, and Backward Views. Swath width is 35km. |
|---|---|
| Observation Mode 2 | Nadir view with 70km swath width and Backward view with 35km swath width. |
| Observation Mode 7 | Nadir view with 35km swath width. |
PRISM cannot observe areas beyond 82 degrees south and north latitude.
Read more on the JAXA website.
PRISM Data
PRISM data was 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
.
PRISM Processing Information
AADN used the JAXA processor for processing ALOS PRISM data, which is periodically updated. PRISM processor versions formerly employed by AADN can be viewed here.