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User's manual
You can download the manual of G-Portal including the method of direct download by FTP etc. here (link to user manual). 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 ALOS/ALOS-2
Products of GCOM-C

Common


Q1. I cannot login.

A. To log in, you need your User account and password that has been set at user registration.
Confirm your User Account and password again that you entered them correctly.
If you forgot your password, you can reset the password from the home page.

If you forgot your user account, contact the G-Portal Support Desk.

Q2. 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.

Q3. How can I get multiple products collectively?

A. To get products all together, we recommend using FTP.
If you cannot use FTP, contact the G-Portal Support Desk.

Q4. I logged in G-Portal using ftp command of linux computer, but I cannot retrieve directory listing.

A. When you use the ftp command of Linux computer, you should set the passive mode as the transfer mode.

Q5. The cutout function of request processing on the G-Portal doesn't work.

A. Scope of region extraction is based on whether the scan center is within the rectangular specified range or not.
    Therefore, you should include the scan center in it.
    For more details, please refer to the Appendix-6 of G-Portal User Manual. (p.107)

Q6. When batch production request of some products was processed on G-Portal WEB, I selected "Batch download (tar)" and downloaded the compressed files. However, I couldn't uncompress it.

A. You downloaded the file whose format was "tar+gz(tgz)".
    However, during file download, the browser automatically assigns the extension ".gz" to the filename depending on the browser. In that case, please change the file extension from ".gz" to ".tgz" and uncompress it.

Q7. Can I confirm my history of production request?

A. Yes. Detailed procedures are written in this document.

Q8. 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.

Q9. 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. The unit of soil moisture values is different between the soil moisture product of AMSR-E [g/cm3] and
AMSR2 [%]. How can I convert them mutually?

A. The mass of water [g] containing in 1 cm3 of soil is converted to percentage, and it is stored in the soil
    moisture product of AMSR2.
    Therefore, you can convert the soil moisture value (SMC) [%] to SMC [g/cm3] using the below equation.
      SMC [g/cm3] = SMC [%]/100
    And vice versa.
      SMC [%] = SMC [g/cm3]×100

Q2. Could you tell me the unit of soil moisture values in the sea ice concentration product of AMSR2?

A.It is "%".
You can confirm the unit of geophysical values in the below document:
Global Change Observation Mission Water(GCOM-W1)AMSR2 Higher Level Product Format Specification


Q3. 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.

Q4. 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)


  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

Q5. 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)


Q6. 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 ALOS/ALOS-2


Q1. I cannot download a product.

A. Users are able to search ALOS/ALOS-2 Products, but unable to download from G-Portal.
    If you need to use them, please refer to the following websites;

<ALOS/PRISM Product>     
  • Remote Sensing Technology Center of Japan
  •       https://www.restec.or.jp/en/contact-data_inquiry.php     
  • PASCO CORPORATION
  •       http://en.alos-pasco.com/alos/

    <ALOS/PALSAR, AVNIR-2 Product>     
  • Remote Sensing Technology Center of Japan
  •       https://www.restec.or.jp/en/contact-data_inquiry.php

    <ALOS-2/PALSAR-2 Product>     
  • Remote Sensing Technology Center of Japan
  •       https://www.restec.or.jp/en/solution/product/alos-2.html     
  • PASCO CORPORATION
  •       http://en.alos-pasco.com/alos-2/

    Contact
    Thank you for using G-Portal.
    If you have any questions, please contact us below.
    We accept inquiries by email at any time.
    * The support desk is closed on weekend, National holidays in Japan and New Year holidays (December 29 – January 3).
    * Depending on the status and content of your inquiry, it may take some time to respond.


    Contact for G-Portal Support Service
    Contact : Japan Aerospace Exploration Agency G-Portal support desk
    Address : Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 JAPAN
    E-mail : z-gportal-support[*]ml.jaxa.jp
    (Note) Please change [*] to @.
    Contact for privacy Policy
    Sorry to trouble you, but please check JAXA privacy Policy.


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