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Remote Sensing Technology Center of Japan

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Solution

PALSAR Global Orthorectified Mosaic Dataset (PGM)

This is a PALSAR Data Set that carries out ortho-correction and mosaic processing, with a resolution of 10m or 25m, enabling worldwide coverage. The data is in tile units (1 degree, per polarized wave).

Note: Intellectual property rights for this product belong to the Japan Aerospace Exploration Agency (JAXA). RESTEC has developed this product under contract to JAXA, and RESTEC owns the selling rights.

This image was created by conducting color combination in a PGM product.

Special features
  • radar images that are unaffected by the weather
  • Because ortho-correction has been implemented, data can be superimposed on map
  • coverage of the entire world (same observation conditions in almost the same time frame, June to October)
  • mosaic images, avoiding lines connecting separate images
  • high-precision images (10m/25m)

※ We suspended the sale of PGM(Resolution25m)products.

Unique features of this product

  • It enables the provision of data for only the necessary areas of interest throughout the world.
  • It makes it easy to superimpose data on map data such as those utilizing GIS.
  • Frequently encountered problems with SAR have been resolved, and the PALSAR Global Ortho Mosaic Dataset makes it much easier to decipher features such as mountains.
  • This product is made to the same high standard throughout the world, enabling interannual comparison under the same conditions (Asc. Mode, 34.3°, FBD observation mode)

On product expansion samples

This shows a man-made structure (airport) (approx. 5km²).

Pixel spacing 10m product (HH)

Pixel spacing 10m product (HV)

Size of a Tile

1 degree (lat.), equiv. to approx.
100 km near the Equator

10m product

11,132 columns×11,132 lines
However, in certain areas (latitude 60 degrees and above), 5 degrees by 5 degrees

25m product

4,500 columns×4,500 lines
However, in certain areas (latitude 60 degrees and above): 5,566 columns×5,566 lines

Optional service: color combination

Color combination is conducted using two files included in a PGM product. By expressing differences through color, it is possible to depict the conditions of the earth’s surface in greater detail.

Man-made structures

Example of a man-made structure (airport) (approx. 5km sq.) It is possible to understand the state of the ground cover, etc.

Nature

Example of natural bodies (rivers, rice paddies) (approx. 5km sq.) The distinction between land areas and water areas can be utilized.

Specifications

Global Mosaic Dataset with ortho-processing completed,using PALSAR FBD (HH, HV)

  • Off-nadir angle: 34.3 degrees
  • Mainly uses DEM: SRTM-3(90m grid) for ortho-correction
  • A mosaic dataset based on JERS SAR(1992-1998)is also available.
Pixel spacing for both latitude and longitude,approx. 0.32 seconds (equivalent to10m latitude)
for both latitude and longitude,approx. 0.8 seconds (equivalent to 25m latitude)

In regions with a latitude of 60 degrees or more, latitude of approx. 3.2 seconds, longitude of approx. 3.2 seconds

Geometric accuracy 13m RMSE(1σ)

Comparison with position of corner reflector determined by GPS*1

Radiometric accuracy backscatter coefficient 0.76dB (1σ)

accuracy for original data*3
Inter-path brightness differential when using mosaic minimized*1

Slope correction on/off (selection possible)*2

Choose either ‘on’ or ‘off’

Geodetic coordinate system ITRF97

Ellipsoid: GRS8, Geoid: EGM96

Map projection equal latitude/longitude projection
Observation date discrimination per pixel possible

The total number of days from the day of the launch is recorded, by pixel, in the observation day file.

Purchase unit latitude 1 degree × longitude 1 degree

near the Equator, approx. 100km square
in some regions that use 10m products (latitude of 60 degrees or more), service is provided in units of 5 degrees×5 degrees

Data format GeoTIFF

World file (*.twf) is not included
It is also possible to provide service via raw data and ENVI header files.

Reference paper

*1 Mosaic image compilation in general
Shimada, M. and Ohtaki, T., Generating Large-Scale High-Quality SAR Mosaic Datasets: Application to PALSAR Data for Global Monitoring., IEEE J. OF SELECTED TOPICS IN APPL. EARTH OBS. AND REMOTE SENS., PP.637-656, VOL3., NO.4, DEC, 2010

*2 Ortho-conversion and geometric precision
Shimada, M., Ortho-Rectification and Slope Correction of SAR Data Using DEM and Its Accuracy Evaluation., IEEE J. OF SELECTED TOPICS IN APPL. EARTH OBS. AND REMOTE SENS., PP.657-671, VOL3., NO4, DEC, 2010

*3 PALSAR CALVAL in general
Shimada, M., et. Al., PALSAR Radiometric and Geometric Calibration, IEEE Transactions on Geoscience and Remote Sensing, PP3915-3932, Issue12,2009

Product file composition (GeoTIFF-format products)

1. HH polarized wave image 16bit-unsigned

World file (*.twf) not included

2. HV polarized wave image 16bit-unsigned

It is also possible to provide service via raw data and ENVI header files.

3. Observation day data 16bit-unsigned

Total number of days, counting the day of the satellite launch as No. 1

4. Angle of incidence data 8bit-unsigned

The angle formed by the slope gradient and the incident direction of the beam

5. Mask data 16bit-unsigned

0: effective data, 50: water regions such as oceans, 100: layover, 150: shadow, 255: normal

Product Availability

Polarization:PALSAR FBD34.3 (HH/HV)
(Ascending)
Year Resolution
10m(0.32 sec) 25m(0.8 sec)
2010
2009
2008
2007

※ We suspended the sale of PGM(Resolution25m)products.

Polarization:JERS-1 SAR(HH)(Descending)
Year Resolution
10m(0.32 sec) 25m(0.8 sec)
1992-1998

※ We suspended the sale of PGM(Resolution25m)products.

Price list

In regard to the optional comparative images of HH polarized waves and HV polarized waves, and color combination images, please consult us separately.

Sales unit Resolution
10m(0.32 sec) 25m(0.8 sec)
1×1 degree 70,000 yen 35,000 yen
Polygon specified*1 100,000 yen/10,000Km2 50,000 yen/10,000Km2
National unit Please contact to our customer service section.
data@restec.or.jp

(Excluding tax)

※ We suspended the sale of PGM(Resolution25m)products.

*1 In the case of polygon specified, the minimum scale of order is 1 tile including polygon (1×1 degree).

We offer a discount when multiple sets are ordered: 50% off for the second set, 75% off for the third set.
Example of multiple set order: If purchasing resolution 10m, 1 tile (1 degree × 1 degree) for year 2009: 70,000 yen; and for same place, for year 2007: 35,000 yen