Minimize AVNIR-2 & PRISM Products and Algorithms

ALOS products follow the standard CEOS format convention. The detailed product format specifications have been defined and are maintained by JAXA.

Detailed information is available here

 

Products Information    |   Processor Releases 

Minimize Available Products

Products provided by ADEN are generated using the JAXA processor, integrated in the ADEN ground segment. Therefore, product format and auxiliary information provided in the product (product coordinates, calibration parameters, etc) are those defined by JAXA

Minimize AVNIR-2 Standard Products
ADEN AVNIR-2 products availability

Level

Definition

Option

Note

1A

Uncompressed, reconstructed digital counts appended with radiometric calibration coefficients and geometric correction coefficients (appended but not applied)

 

Separate image files for each band

1B1

Radiometrically calibrated data at sensor input

 

Separate image files for each band

1B2

The following correction options are available: R: Geo-reference data; G: Geo-corded data; D: Rough DEM (Digital Elevation Model) correction: this option corrects the topographical influence to the areas where DEM was covered. DEM correction is effective only in Japanese region. There is a possibility that DEM correction error will occur when pointing angle is large. In this case, accuracy is not guaranteed because interpolation is carried out in the error area. If specifying this option outside the Japanese region, D option becomes effective, however, DEM applied product is not generated. That is; the product, which is defined as altitude = 0m, will be generated.

Map-Projection:

UTM,

Polar Stereographic

Resampling:

Nearest Neighbour

Cubic Convolution

Bi-Linear

Separate image

files for each band

NB : Level 0 is not available for use

Minimize AVNIR-2 Product Characteristics
  • Level 1A is not calibrated.
  • A summary file (ASCII file) is joined to data processed into summary file. This ASCII file embeds basic information on product metadata.
  • Pixel spacing:
    • Pixel spacing to be applied for transformation from level 1B1 to level 1B2 is strongly depend on pointing angle of AVNIR-2 instrument when observing the area of interest. This parameter is fixed by the processor following the pointing angle:
Pixel spacing vs pointing angle
Pointing angle 0 to 31.6 degrees angle 31.6 to 40.3 degrees More than 40.3 degrees
Pixel spacing (m) 10 15 20
  • Gain and offset:
    • Radiometric rescaling gain and offset values per each band are expressed in W/m2str­m and can be retrieved from product processed into CEOS format. These values are stored in the scene header record. Processing chain is applying a pre-flight calibration. Coefficients have been determined before launch. No in-flight calibration is applied yet, results from internal calibration lamps are used for monitoring only.
  • Spectral Solar irradiance:
    • Solar spectral irradiance values are not provided with the product processed into CEOS format. It can be computed using article from Thuillier 2003 and are following ones:
Solar Irradiance
Band Band 1 Band 2 Band 3 Band 4
Central Wavelength (nm) 463 560 652.1 820.6
Solar spectral irradiance (W/m2/_m) 1943.3 1813.7 1562.3

1076.5

  • Projection parameter:
    • Users can choose between UTM or Polar Stereographic.The projection parameters are fixed by the processor.
    • The Polar stereographic parameter corresponds to the latitude/longitude of the scene centre.
  • Geolocation information
    • Rational Polynomial Coefficients (RPC) are not provided with the product format. If users want to apply map projection; to transform geo referenced product to geo coded product, they shall need to use polynomial coefficients provided with CEOS format.
Minimize PRISM Standard Products
ADEN PRISM products availability

Level

Definition

Option

Note

1A

Uncompressed, reconstructed digital counts appended with radiometric calibration coefficients and geometric correction coefficients (appended but not applied)

Individual files for forward, nadir and backward looking data.

 

Separate image files for each CCD

1B1

Radiometrically calibrated data at sensor input

 

Separate image files for each CCD

1B2

The following correction options are available: R: Geo-reference data; G: Geo-corded data

Map-Projection:

UTM,

Polar Stereographic

Resampling:

Nearest Neighbour

Cubic Convolution

Bi-Linear

Single image file

NB : Level 0 is not available for use

Minimize PRISM Product Characteristics
  • Level 1A is not calibrated.
  • A summary file (ASCII file) is joined to data processed into summary file. This ASCII file embeds basic information on product metadata.
  • Geolocation information
  • Rational Polynomial Coefficients (RPC) are not provided with the product format. If users want to apply map projection; to transform geo referenced product to geo coded product, they shall need to use polynomial coefficients provided with CEOS format.
  • Projection parameter:
    • Users can choose between UTM and Polar Stereographic. The projection parameters are fixed by the processor.The Polar stereographic parameter corresponds to the latitude/longitude of the scene centre