The ALOS Ortho Rectified Image Product (ALOS-ORI) released by the Japan Aerospace Exploration Agency (JAXA) is open to the public. The ALOS-ORI consists of the AVNIR-2 ORI product compiled from images acquired by the Advanced Land Observing Satellite “DAICHI” (ALOS) operated during the period from 2006 to 2011. NASA, in cooperation with JAXA, makes the dataset available through the ASF DAAC.
|Sensor||Advanced Visible and Near-Infrared Radiometer (AVNIR)-2|
|Cloud Cover||30% or less|
|Resolution||approximately 10m mesh|
|Observation Bands|| Band-1 0.42 - 0.50 µm|
Band-2 0.52 - 0.60 µm
Band-3 0.61 - 0.69 µm
Band-4 0.76 - 0.89 µm
|Scanning Method||Push Broom|
|Spatial Resolution||10 (at Nadir)|
|Swath Width||70km (at Nadir)|
Orthorectification is the process of removing image distortions caused by the sensor and terrain to create a planimetric image at every location with consistent scale across all parts of the image. This allows the overlay of various geospatial information with the ORI (Ortho Rectified Image) on any map.
The AVNIR-2 ORI product is created from AVNIR-2 1B1 data after stereo matching with reference to the Panchromatic Remote-Sensing Instrument for Stereo Mapping (PRISM) ORI. AW3D30 DSM data, which is created from a PRISM triplet image, is used for the orthorectification processing. If AW3D30 is missing, SRTM (The Shuttle Radar Topography Mission) DSM data is used.
The AVNIR-2 ORI product zip file contains the following files:
Band-1 0.42 – 0.50 µm (8bit GeoTIFF)
Band-2 0.52 – 0.60 µm (8bit GeoTIFF)
Band-3 0.61 – 0.69 µm (8bit GeoTIFF)
Band-4 0.76 – 0.89 µm (8bit GeoTIFF)
Header file (ASCII text)
Please refer to AVNIR-2 Ortho Rectified Image Product Format Description
ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data products usage conditions:
(i) JAXA does not guarantee any specific quality and the timely provision of the ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data products and shall not be liable for any damage brought about using them.
(ii) The intellectual property rights, including but not limited to copyrights, of the ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data Products belong to JAXA.
(iii) The user shall retain the ownership of value-added products (modified products with high-level processing which are irreversible to standard data. High-level data processing includes data analysis or combining multiple- ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data Product, image processing based on external information, and physical quantity conversion).
(iv) When the user publish and/or redistribute their-generated value-added products based on the ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data Product, users will indicate, “the original ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSARdata products are provided by JAXA”.
(v) When the user intends to publish the results directly using or indirectly based on the ALOS/PALSAR/AVNIR-2 and ALOS-2 ScanSAR data products, the user will indicate owner of the Data Products as “©JAXA [year of acquisition]. All rights reserved”.