ALOS PRISM

Long name Advanced Land Observing Satellite (ALOS) Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM)
Short name ALPR
Key file name (use to open data set) VOL-ALPSM*
Supported file extensions *.led, *.sup, *.trl, *.img
Sensor Optical
Platform ALOS
Data distributor Earth Observation Research Center
Sections

Data product name and description
Distribution disk files
Returned data
Returned file-level metadata
Returned channel-level metadata
References

Data product name and description

Data product Description Version
Level 1A This is PRISM raw data extracted from the Level 0 data, expanded and generated lines. Ancillary information, such as radiometric information, is required for the processing, superior to the Level 1B is added.

(Nadir mode, foward, backward view)
(Nadir 70km observation mode)

Georeference

Image file is created per CCD unit.
For 35km x 35km 4 CCD units.
For 70km x 35km 6 CCD units.

1
Level 1B1 This is the data that performed radiometric absolute calibration coefficient. Ancillary information such as radiometric superior to the Level 1B2 is added.

(Nadir mode, forward, backward view)
(Nadir 70km observation mode)

Georeference

Image file is created per CCD unit.
For 35km x 35km 4 CCD units.
For 70km x 35km 6 CCD units.

1
Level 1B2

-1B2R 35kmx35km
-1B2R 70kmx35km
-1B2G Variable size

This is the data that performed geometric correction to Level 1B1 data. The following correction options are available.

-1B2R Nadir normal mode
forward, backward view
Georeference data

-1B2R Nadir observation mode
Georeference data

-1B2G Nadir normal mode
forward, backward view
Nadir 70 km Observation mode
Geocoded data

The image size will be variable and double at the maximum. There is only one image file in total, since each CCD was combined to make one scene.

1

Distribution disk files

File name File type Required Contents Details
VOL* CEOS Yes Volume descriptor Volume file
IMG* CEOS Yes Image data Image file
LED* CEOS Yes

Scene header
Map protection
Radiometric collection
Platform position data

Leader file
TRL* CEOS Yes Histogram data Trailer file
SUP* CEOS No

Precession orbit data
Conventional orbit data

Supplemental file
RPC* Text No Rational functions N/A

Returned data

Data product Data returned Details
Panchromatic image (single band) One channel for panchromatic data (PAN).

Resolution: 2.5 meters

GDB retrieve one image band form one image file for panchromatic data.
Panchromatic image (assembled by CCD bands) Geometric uncorrected image of PRISM image file is created per CCD unit.

Resolution: 2.5 meters

GDB retrieve six or eight image bands and assembled them to one PAN channel.
Rational Functions Model Data One binary segment for Rational Functions Model Data information. GDB generate a binary segment for Rational Functions Data.
Orbit data One orbit segment for orbit data. GDB generate a orbit segment for orbit Data.

Returned file-level metadata

Name Description Value
Acquisition_DateTime Acquisition date and time of the image YYYY-MM-DDTHH:MM:SS.XXXXXXZ
AcrossTrackAngle Across-track angle Real
AngleofSolarElevation Angle of solar elevation Real
ColumnCount Number of columns in the image Integer
FormatName Product data format String
NominalLocation_Latitude Latitude of nominal location Real
NominalLocation_Longitude Longitude of nominal location Real
NumberOfBands Number of bands in the image Integer
OrbitInclination Inclination of orbit Real
OrbitPeriod Period of orbit Real
PlatformName Name of platform String
ProductType Type of product data String
RowCount Number of rows in the image Integer
SensorCode Code of the sensor that acquired the data String
SensorModelName Model name of the sensor that acquired the data String
SensorType Type of sensor Optical
SolarAzimuth Solar azimuth String
SourceID Unique ID of the image source String
MD_SpatialResolutionX Horizontal spatial resolution of the image Real
MD_SpatialResolutionY Vertical spatial resolution of the image Real

Returned channel-level metadata

Name Description Value
MaxWavelength Maximum wavelength Real
MinWavelength Minimum wavelength Real
WaveLengthUnits Wavelength units String
RadiometricTransGain Radiometric gain Real
RadiometricTransOffset Radiometric offset Real
RadiometricTransUnits Radiometric units W.m-2.sr-1.um-1

References

For more information, visit: eorc.jaxa

Search "ALOS PRISM".

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