- Dataset Availability
- 2014-08-04T00:00:00Z–2025-08-10T17:08:42.357000Z
- Dataset Provider
- JAXA EORC
- Tags
Description
The 25 m PALSAR-2 ScanSAR is normalized backscatter data of PALSAR-2 broad area observation mode with observation width of 350 km. The SAR imagery was ortho-rectificatied and slope corrected using the ALOS World 3D - 30 m (AW3D30) Digital Surface Model. Polarization data are stored as 16-bit digital numbers (DN). The DN values can be converted to gamma naught values in decibel unit (dB) using the following equation:
- γ 0 = 10*log 10 (DN 2 ) - 83.0 dB
Level 2.2 data are ortho-rectified and radiometrically terrain-corrected.
This dataset is compatible with the Committee on Earth Observation (CEOS) Analysis Ready Data for LAND (CARD4L) standard.
Bands
Pixel Size 25 meters
Bands
HH
HH polarization Terrain-flattened Gamma-Nought backscatter coefficient.
HV
HV polarization Terrain-flattened Gamma-Nought backscatter coefficient.
LIN
Local incidence angle. The angle formed by the radar irradiation direction and the normal of the slope.
MSK
Data quality bitmask.
Image Properties
Image Properties
| Name | Type | Description |
|---|---|---|
|
AntennaPointing
|
STRING | Antenna pointing direction ("Right" or "Left"). |
|
AzimuthPixelSpacing
|
DOUBLE | Azimuth pixel spacing. |
|
AzimuthResolution
|
DOUBLE | Azimuth resolution. |
|
BeamID
|
STRING | Beam ID. |
|
DataAccess_ProcessingTime
|
STRING | Processing time of this product (ISO8601 string). |
|
DataAccess_SoftwareVersion
|
STRING | Software version of this product. |
|
DigitalElevationModel
|
STRING | Type of DEM used ("Elevation" or "Surface"). |
|
EasternBias
|
DOUBLE | Bias of easting error. |
|
EasternSTDev
|
DOUBLE | Standard deviation of easting error. |
|
Easting_LR
|
DOUBLE | Easting of Lower Right of Product. |
|
Easting_UL
|
DOUBLE | Easting of upper left of product. |
|
Estimates_HH
|
DOUBLE | Estimated HH value in Noise Equivalent Intensity (NESZ). |
|
Estimates_HV
|
DOUBLE | Estimated HV value in Noise Equivalent Intensity (NESZ). |
|
FilterApplied
|
STRING | Whether a filter was applied ("TRUE" or "FALSE"). |
|
FilterType
|
STRING | Filter type (N/A if no filtering was applied). |
|
FirstAcquisitionDate
|
STRING | Observation date of the first acquisition (ISO8601 string). |
|
IDCMethod
|
STRING | Ionospheric delay correction ("TEC model" or "Coregistration"). |
|
IncAngleFarRange
|
DOUBLE | Incident angle in far range. |
|
IncAngleNearRange
|
DOUBLE | Incident angle in near range. |
|
IonosphericDelayCorrectionApplied
|
DOUBLE | Whether ionospheric delay correction was applied ("TRUE" or "FALSE"). |
|
LastAcquisitionDate
|
STRING | Observation date of the last acquisition (ISO 8601 string). |
|
NRAlgorithm
|
STRING | Noise removal algorithm. |
|
NoiseRemovalApplied
|
STRING | Whether noise removal algorithm was applied ("TRUE" or "FALSE"). |
|
NorthernBias
|
DOUBLE | Bias of northing error. |
|
NorthernSTDev
|
DOUBLE | Standard deviation of northing error. |
|
Northing_LR
|
DOUBLE | Northing of lower right of product. |
|
Northing_UL
|
DOUBLE | Northing of upper left of product. |
|
ObservationMode
|
STRING | Observation mode. |
|
OrbitDataSource
|
STRING | Orbit data source (e.g., predicted, definite, precise, downlinked). |
|
PassDirection
|
STRING | Pass direction ("Ascending" or "Descending"). |
|
Polarizations
|
STRING_LIST | Transmit/Receive polarisation for the data. There is one element for each Tx/Rx combination: ['VV'], ['HH'], ['VV', 'VH'], or ['HH', 'HV']. |
|
ProductColumnSpacing
|
DOUBLE | Product column spacing. |
|
ProductRowSpacing
|
DOUBLE | Product row spacing. |
|
Product_Version
|
DOUBLE | Product version. |
|
RSP_Frame_Number
|
INT | Scene frame number. |
|
RSP_Path_Number
|
INT | Scene path number. |
|
RadarCenterFrequency
|
DOUBLE | Center frequency. |
|
RangePixelSpacing
|
DOUBLE | Range pixel spacing. |
|
RangeResolution
|
INT | Range resolution. |
|
SlantRangeCorrection
|
INT_LIST | The correction for each scan described from the first scan. |
|
SourceProcParam_ProcessingDate
|
STRING | Processing date of the source product (ISO8601 string). |
|
SourceProcParam_ProcessingFacility
|
STRING | Processing facility of the source product. |
|
SourceProcParam_ProductID
|
STRING | Product ID of the source product. |
|
SourceProcParam_SoftwareVersion
|
DOUBLE | Software version of the source product. |
Terms of Use
Terms of Use
Anyone can use this data free of charge subject to the to the attribution requirements. For detailed terms of use see JAXA G-Portal Terms of service (Section 7. Condition concerning of G-Portal data).
Citations
-
The data used for this paper have been provided by Earth Observation Research Center (EORC) of Japan Aerospace Exploration Agency (JAXA).
Explore with Earth Engine
Code Editor (JavaScript)
var collection = ee . ImageCollection ( 'JAXA/ALOS/PALSAR-2/Level2_2/ScanSAR' ) . filterBounds ( ee . Geometry . Point ( 143 , - 5 )); var image = collection . first (); Map . addLayer ( image . select ([ 'HH' ]), { min : 0 , max : 8000 }, 'HH polarization' ); Map . centerObject ( image );
