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You can download the manual of G-Portal including the method of direct download by SFTP etc. here. Please refer to Operational Information / Related Documents for the documentation on each product format.
FAQ
Common
Products of GCOM-W1
Products of Aqua
Products of ADEOS-Ⅱ
Products of GPM
Products of ALOS/ALOS-2
Products of GCOM-C
Q1. What should I do if I cannot log in?
A. If you cannot log in to G-Portal website, please check that you have entered the correct user account and password.
If you have forgotten your password, you can reset it on login page.
Please note that if you enter the wrong password five times in a row, your account will be locked.
Q2. I entered the wrong password several times on the website and my account might be locked. How can I unlock it?
A. If your account is locked on the website, it will be automatically unlocked after 10 minutes.
Please wait 10 minutes and then try to log in again.
If you have forgotten your password, you can reset the password by following the manual below.
G-Portal User's manual
2.3.2. If you have forgotten your password
https://img.gportal.jaxa.jp/upload/COMMON/GPortalUserManual_en.pdf#page=19
Q3. I entered the wrong password several times on the SFTP site and my account might be locked. How can I unlock it?
A. If your account is locked on the SFTP site, it will be automatically unlocked after 24 hours.
Please wait 24 hours and then try to log in again.
If you have forgotten your password, you can reset the password by following the manual below.
G-Portal User's manual
2.3.2. If you have forgotten your password
https://img.gportal.jaxa.jp/upload/COMMON/GPortalUserManual_en.pdf#page=19
Q4. I cannot view a page correctly.
A. Some of the contents on our website use JavaScript.
If JavaScript setting is disabled on your browser, it may not work correctly, or it may not be possible to view the pages correctly.
To use all the contents, we recommend enabling the JavaScript setting on your browser.
Also, if the screen is distracted, please try again to clear your browser's cache.
Q5. I received an email indicating that the processing request failed.
A. You will receive an email if the processing request fails for any reason. Please refer to the reason, and try the request again. There are cases the “Download” button is displayed in the production result list, although the status field is “processing error”. In that case, you can download the product.
Q6. Can I search for specific products using the CSW server?
A. Yes. You can search for products by specifying the Dataset ID associated with each product.
Please refer to the following document for a list of Dataset IDs:
https://img.gportal.jaxa.jp/upload/COMMON/G-Portal_datasetID_list.pdf
In addition, as part of the G-Portal renewal on October 1, 2026, the bulk download function for multiple files through the website has been discontinued.
As an alternative, we have improved usability by allowing users to perform searches through the CSW service and download data through the SFTP site.
Sample scripts and user guides for searching and downloading products using the CSW service and the SFTP site are available at the following page:
https://www.gportal.jaxa.jp/information/csw
The CSW service also supports various search conditions as optional parameters, similar to those available on the G-Portal website. We encourage users to take advantage of this functionality.
Q7. How to write credits?
A. When the user publishes analyzed results from G-Portal data, the user shall indicate proper credit as defined in the TABLE shown in G-Portal Terms of service section 7.
However, some journals and associations has rules for citation, reference and acknowledge. In that case, the user shall indicate organization(JAXA) and satellites/sensors.
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A.
1) L1A and L1B product
The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
2) L1R product
The geolocation information for 6-36 GHz channels of L1R product corresponds to that of odd-numbered
points (origin 1) of cross-track direction for 89 GHz A channel.
Q2. How can I get the geolocation information of L3 products.
A. The geolocation information is not included in HDF formatted L3 products.However, there are 2 ways to get the information.
1) The geolocation information is included in L3 products converted into NetCDF format.
It is only available by ordering via GCOM-W1 Data Providing Service.
(This converting service is not available by sftp direct download.)
2) Use AMSR2 Product I/O Toolkit (AMTK).
For more information, please refer to the following document:
Notice:
If you refer the geolocation information, please care to the following:
NetCDF - correspond to that of upper left point in pixel
AMTK - correspond to that of center point in pixel
Q3. Could you tell me the details of "Time Information" stored in the AMSR2 L3 (daily average) product?
A. The details are as follows:
1) A value in "Time information" (T) is the rest part obtained by removing the date part from an observation time (UTC).
The rest part is converted to the elapsed time from 0:00 to be used as T. The unit for T is minute.
2) T is the mean value or the latest value, which depends on a kind of the geophysical value corresponding to it.
3) If T for some geophysical value is defined as the mean value, and the geophysical value is actually made
from more than two observation data, the value finally stored in "Time Information" is not T but -T.
You can confirm the details of "Time information" (e.g. which, the mean value or the latest value, is used
as T for each geophysical value) in the below document:
Q4. How can I search the AMSR2/L3 Sea-Ice-Concentration(SIC) product on G-Portal website?
A. The map projection type of AMSR2/Level3 SIC product is "Polar-Stereo". Therefore, you should select "Polar Stereographic South" or "Polar Stereographic North" as the background map on G-Portal website.
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A. The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A. The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
Q1. Why are processing requests for GPM version 8 products failing?
A. When updating to GPM version 8 products, the file format changed from HDF5 to NetCDF4.
Due to this change, this products cannot be processed.
Therefore, please download the GPM version 8 product without processing it.
Q1. What is the "ALOS Series Open and Free Data" provided via G-Portal? Do they include high-resolution data of ALOS-2?
A. The "ALOS Series Open and Free Data" available on G-Portal include the following products. ALOS-2/PALSAR-2 high-resolution data and ALOS/PRISM data are not corresponded.
ALOS-2/PALSAR-2 high-resolution data is provided for a fee by the distributors listed in FAQ Q2.
https://www.eorc.jaxa.jp/ALOS/en/dataset/alos_open_and_free_e.htm
Q2. Please tell me how to download the ALOS/ALOS-2 data.
A. We provide the ALOS/ALOS-2 products shown in Q1 above as "ALOS Series Open and Free Data" via G-Portal. You can search for other ALOS and ALOS-2 products, but you cannot download them. These products are available for a fee via the distributors listed below.
＜ALOS-2/PALSAR-2 Product＞
•Remote Sensing Technology Center of Japan
https://www.restec.or.jp/en/solution/product/alos-2.html
•PASCO CORPORATION
https://alos-pasco.com/en/alos-2/
＜ALOS/PRISM Product＞
•Currently, there are no distributors.
Q3. I tried to download ALOS/ALOS-2 data, but the "Download" button doesn't appear.
A. In the following cases, the "Download" button for ALOS/ALOS-2 data will not be displayed on the search results list.
2. Introduction of each Open & Free data type
- 1) ALOS-2 / PALSAR-2 Product
- 1. JAXA G-Portal
https://www.eorc.jaxa.jp/ALOS/en/dataset/alos_open_and_free_e.htm
Q4. Is the "ALOS series Open and Free data" processed using High Accuracy Orbit Information?
A. All of the "ALOS series Open and Free data" that can be downloaded via G-Portal is processed using High Accuracy Orbit Information.
Products of GCOM-W1
Products of Aqua
Products of ADEOS-Ⅱ
Products of GPM
Products of ALOS/ALOS-2
Products of GCOM-C
Common
Q1. What should I do if I cannot log in?
A. If you cannot log in to G-Portal website, please check that you have entered the correct user account and password.
If you have forgotten your password, you can reset it on login page.
Please note that if you enter the wrong password five times in a row, your account will be locked.
Q2. I entered the wrong password several times on the website and my account might be locked. How can I unlock it?
A. If your account is locked on the website, it will be automatically unlocked after 10 minutes.
Please wait 10 minutes and then try to log in again.
If you have forgotten your password, you can reset the password by following the manual below.
G-Portal User's manual
2.3.2. If you have forgotten your password
https://img.gportal.jaxa.jp/upload/COMMON/GPortalUserManual_en.pdf#page=19
Q3. I entered the wrong password several times on the SFTP site and my account might be locked. How can I unlock it?
A. If your account is locked on the SFTP site, it will be automatically unlocked after 24 hours.
Please wait 24 hours and then try to log in again.
If you have forgotten your password, you can reset the password by following the manual below.
G-Portal User's manual
2.3.2. If you have forgotten your password
https://img.gportal.jaxa.jp/upload/COMMON/GPortalUserManual_en.pdf#page=19
Q4. I cannot view a page correctly.
A. Some of the contents on our website use JavaScript.
If JavaScript setting is disabled on your browser, it may not work correctly, or it may not be possible to view the pages correctly.
To use all the contents, we recommend enabling the JavaScript setting on your browser.
Also, if the screen is distracted, please try again to clear your browser's cache.
Q5. I received an email indicating that the processing request failed.
A. You will receive an email if the processing request fails for any reason. Please refer to the reason, and try the request again. There are cases the “Download” button is displayed in the production result list, although the status field is “processing error”. In that case, you can download the product.
Q6. Can I search for specific products using the CSW server?
A. Yes. You can search for products by specifying the Dataset ID associated with each product.
Please refer to the following document for a list of Dataset IDs:
https://img.gportal.jaxa.jp/upload/COMMON/G-Portal_datasetID_list.pdf
In addition, as part of the G-Portal renewal on October 1, 2026, the bulk download function for multiple files through the website has been discontinued.
As an alternative, we have improved usability by allowing users to perform searches through the CSW service and download data through the SFTP site.
Sample scripts and user guides for searching and downloading products using the CSW service and the SFTP site are available at the following page:
https://www.gportal.jaxa.jp/information/csw
The CSW service also supports various search conditions as optional parameters, similar to those available on the G-Portal website. We encourage users to take advantage of this functionality.
Q7. How to write credits?
A. When the user publishes analyzed results from G-Portal data, the user shall indicate proper credit as defined in the TABLE shown in G-Portal Terms of service section 7.
However, some journals and associations has rules for citation, reference and acknowledge. In that case, the user shall indicate organization(JAXA) and satellites/sensors.
Products of GCOM-W1
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A.
1) L1A and L1B product
The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
AMSR2 Level 1 Product Format Specification(Level 1A, p. 4-16)
2) L1R product
The geolocation information for 6-36 GHz channels of L1R product corresponds to that of odd-numbered
points (origin 1) of cross-track direction for 89 GHz A channel.
Q2. How can I get the geolocation information of L3 products.
A. The geolocation information is not included in HDF formatted L3 products.However, there are 2 ways to get the information.
1) The geolocation information is included in L3 products converted into NetCDF format.
It is only available by ordering via GCOM-W1 Data Providing Service.
(This converting service is not available by sftp direct download.)
2) Use AMSR2 Product I/O Toolkit (AMTK).
For more information, please refer to the following document:
GCOM-W1AMSR2 Product I/O Tool Kit (AMTK) Operation manual
(2.2 Installing AMTK Table 2.2-1,2.2-3 The contents in AMTK, p2-4,2-7)
(2.2 Installing AMTK Table 2.2-1,2.2-3 The contents in AMTK, p2-4,2-7)
Notice:
If you refer the geolocation information, please care to the following:
NetCDF - correspond to that of upper left point in pixel
AMTK - correspond to that of center point in pixel
Q3. Could you tell me the details of "Time Information" stored in the AMSR2 L3 (daily average) product?
A. The details are as follows:
1) A value in "Time information" (T) is the rest part obtained by removing the date part from an observation time (UTC).
The rest part is converted to the elapsed time from 0:00 to be used as T. The unit for T is minute.
2) T is the mean value or the latest value, which depends on a kind of the geophysical value corresponding to it.
3) If T for some geophysical value is defined as the mean value, and the geophysical value is actually made
from more than two observation data, the value finally stored in "Time Information" is not T but -T.
You can confirm the details of "Time information" (e.g. which, the mean value or the latest value, is used
as T for each geophysical value) in the below document:
Global Change Observation Mission Water（GCOM-W1）AMSR2 Higher Level Product Format Specification
- 3 Product description
Table 3-4 Static method of daily level 3 product (p.3-3)
- 4.2 Dataset
(2) Time Information (P.4-6)
- 3 Product description
Table 3-4 Static method of daily level 3 product (p.3-3)
- 4.2 Dataset
(2) Time Information (P.4-6)
Q4. How can I search the AMSR2/L3 Sea-Ice-Concentration(SIC) product on G-Portal website?
A. The map projection type of AMSR2/Level3 SIC product is "Polar-Stereo". Therefore, you should select "Polar Stereographic South" or "Polar Stereographic North" as the background map on G-Portal website.
Products of Aqua
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A. The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
Products of ADEOS-Ⅱ
Q1. Where can I find the geolocation information for 6-36 GHz channels of brightness temperature in the Level 1 product?
A. The geolocation information for 6-36 GHz channels of L1A and L1B product is derived from
latitude/longitude information for 89 GHz with using the co-registration parameters.
For the details, please refer to the following documents:
Products of GPM
Q1. Why are processing requests for GPM version 8 products failing?
A. When updating to GPM version 8 products, the file format changed from HDF5 to NetCDF4.
Due to this change, this products cannot be processed.
Therefore, please download the GPM version 8 product without processing it.
Products of ALOS/ALOS-2
Q1. What is the "ALOS Series Open and Free Data" provided via G-Portal? Do they include high-resolution data of ALOS-2?
A. The "ALOS Series Open and Free Data" available on G-Portal include the following products. ALOS-2/PALSAR-2 high-resolution data and ALOS/PRISM data are not corresponded.
ALOS-2/PALSAR-2 high-resolution data is provided for a fee by the distributors listed in FAQ Q2.
- ALOS-2/PALSAR-2 ScanSAR (L1.1/L2.2)
- ALOS/AVNIR-2 (L1B1/L1B2/ORI)
- ALOS/PALSAR Fine Resolution Mode (L1.1)
- ALOS/PALSAR Direct Downlink Mode (L1.1)
- ALOS/PALSAR Polarimetry Mode (L1.1)
https://www.eorc.jaxa.jp/ALOS/en/dataset/alos_open_and_free_e.htm
Q2. Please tell me how to download the ALOS/ALOS-2 data.
A. We provide the ALOS/ALOS-2 products shown in Q1 above as "ALOS Series Open and Free Data" via G-Portal. You can search for other ALOS and ALOS-2 products, but you cannot download them. These products are available for a fee via the distributors listed below.
＜ALOS-2/PALSAR-2 Product＞
•Remote Sensing Technology Center of Japan
https://www.restec.or.jp/en/solution/product/alos-2.html
•PASCO CORPORATION
https://alos-pasco.com/en/alos-2/
＜ALOS/PRISM Product＞
•Currently, there are no distributors.
Q3. I tried to download ALOS/ALOS-2 data, but the "Download" button doesn't appear.
A. In the following cases, the "Download" button for ALOS/ALOS-2 data will not be displayed on the search results list.
- Searched without logging in to G-Portal.
- You are looking at the "My List" tab instead of the "Show the list" tab.
- The products displayed on the search results do not correspond to the "ALOS Series Open and Free Data".
2. Introduction of each Open & Free data type
- 1) ALOS-2 / PALSAR-2 Product
- 1. JAXA G-Portal
https://www.eorc.jaxa.jp/ALOS/en/dataset/alos_open_and_free_e.htm
Q4. Is the "ALOS series Open and Free data" processed using High Accuracy Orbit Information?
A. All of the "ALOS series Open and Free data" that can be downloaded via G-Portal is processed using High Accuracy Orbit Information.
