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FAQ
Common
Products of GCOM-W1
Products of Aqua
Products of ADEOS-Ⅱ


Common


Q1. What has changed compared to the G-Portal Beta version?

A. The main changes are below.
* The procedure from search to download can now be done without page transition.
* Login is now available at any time during operation.
* Direct download by FTP became possible.

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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:


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)


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:
AMSR-E Level 1 Product Format Specification(P.L1A-41)
 

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:
AMSR Level 1 Product Format Specification(P.L1A-41)
 
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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
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