Inquiry about the services

q.Where can I search and obtain satellite imagery?

a.

Please see the following page for details.

How to order

q.Can you tell me the provision unit of ALOS and ALOS-2 data?

a.

We provide each satellite product in units of "scenes".

q.Where can I contact if I want to utilize ALOS and ALOS-2 data?

a.

Please see the following link.

Contact us

q.Please tell me about the credit notation of ALOS-2 and ALOS data.

a.

When using ALOS-2 and ALOS data for distribution, etc., please describe the copyright below.

Standard Data

About copyright Copyright: JAXA
©JAXA:ALL RIGHTS RESERVED
©JAXA
About data distribution Distributed by PASCO CORPORATION

Inquiry about specs

q.Can you tell me the accuracy of ALOS and ALOS-2?

a.

Please see the following site for accuracy evaluation

q.Can you tell me when ALOS-2 will observe the data over AOI?

a.

Please see following site for observation date.
In addition, you can download the KML, Shape files and range map of basic observation scenario.

PALSAR-2 Basic
Observation Scenariomap/
User Guideline

q.Can you tell me backscattering coefficient correction value (calibration factor) of ALOS-2?

a.

Please see following site for backscattering coefficient correction value.

ALOS-2/
Calibration Result of
JAXA standard products

Inquiry about the products

q.What are the selective satellite travel direction, ascending and descending when I search the imagery of ALOS and ALOS-2 data?

a.

Ascending (ascending orbit) refers to the orbit of the satellite from south to north, and descending (descending orbit) refers to the orbit of the satellite going from north to south.

q.Can you tell me the processing level of ALOS and ALOS-2 imagery?

a.

Please see the following site for the processing level of ALOS and ALOS-2 imagery.

q.Where can I confirm the information about observation date & time and product processing conditions of ALOS and ALOS-2 imagery?

a.

You can confirm metadata with the summary file (summary.txt) stored in the products.

q.Can you tell me the meaning of resampling method and types?

a.

Meaning

Resampling (rearrangement) generates an intermediate color between the original pixels when performing operations such as enlarging, reducing, rotating, transforming, and changing the resolution of an image.

Types

The table below shows the resampling methods for ALOS-2 and ALOS.
In addition, you can set parameters at levels 1.5 / 2.1 / 3.1.

Types Description Pros Cons
NN:
Nearest neighbor method
Suitable for image analysis because high-speed display is possible and pixel values are used as they are. The pixel values of the original image are preserved Lack of smoothness
BL:
Bilinear method
Suitable for images that change almost continuously, such as terrain Smooth imagery is obtainable Unable to maintain pixel values in the original image
CC:
Cubic
Convolution method
Suitable for image interpretation because it produces clear images. Obtainable averaged images Unable to maintain pixel values in the original image

q.What is the difference between Map North and True North that can be specified by searching ALOS-2 and ALOS images?

a.

The table below shows the map directions and processing levels that can be specified for ALOS-2 and ALOS images.

Direction of Map

Types Contents
Map North Magnetic north (north of map projection method set by processing parameters)
True North True north (North of the North Pole)

Processing level

Satellites/Sensors Configurable
processing level
ALOS/PRISM Level 1B2
ALOS-2/
PALSAR-2
Level 1.5/2.1/3.1

※Level 2.1 is only good for Map North

q.Can you tell me the types of map projection types that I can select?

a.

The map projection types you can select are as follows.

ALOS-2/PALSAR-2:Enable to set with Level 1.5/2.1/3.1
U:UTM(Universal Transverse Mercator)
P:PS(Polar Stereo)※1
M:MER(Mercator)
L:LCC(Lambert conformal conic projection)※2
ALOS/PRISM:Enable to set with Level 1B2
U:UTM(Universal Transverse Mercator)
P:PS(Polar Stereo) ※1

※1 PS is a projection with the North Pole (or South Pole) as the viewpoint
※2 LCC is a fan-shaped map with the North Pole (or South Pole) as the apex.

q.Can you tell me about the DEM used for Level 2.1 ortho processing of ALOS-2 images?

a.

DEM (Digital Elevation Model) used for that is as follows.

For Japan
10m DEM: GISMAP_Terrain:GIS MAP Terrain(Hokkaido Chizu)
Outside Japan
90m DEM:SRTM90m_v4.1:SRTM 90m Digital Elevation Database v4.1(CSI)

q.Can you tell me about the relationship between the scene shift direction and the values (plus and minus values)?

a.

Shift direction of each sensor is as follows.
The direction of travel of the satellite is a plus value.

ALOS-2/PALSAR-2
・Ascending:
Shift to minus direction = Move to South direction
Shift to plus direction = Move to North direction
・Descending:
Shift to minus direction = Move to North direction
Shift to plus direction = Move to South direction
ALOS/PRISM(Applicable only to descending)
Shift to minus direction = Move to North direction
Shift to plus direction = Move to South direction

q.What is the differense berween Georefference and Geocoded?

a.

Geo-reference image

Map projection based on the satellite travel direction.

Geo-coded image

Projected based on the direction on the map.