GOSAT

Sensor	TANSO-CAI and TANSO-FTS
Platform	Greenhouse Gases Observing Satellite (GOSAT)
Data distributor	Japan Aerospace Exploration Agency (JAXA) National Institute for Environmental Studies (NIES) Ministry of the Environment (MOE)
Sections	Data product name and description Distribution disk files Returned data Returned file-level metadata Returned metadata for individual rasters References

Name	Description	Version
Level 1B+	The CAI L1B+ product is a map-projected radiance product obtained by dividing the CAI L1A product into frames and applying data interpolation and band-to-band registration.	First version
Level 1B	The CAI L1B product is a radiance product obtained by dividing the CAI L1A product into frames based on band 3 of the TANSO-CAI sensor, and applying band-to-band registration without interpolation. Map projection is not applied.	First version

File Name	File Type	Required	Contents
GOSATTCAIYYYYMMDDHHmmPPP FFF0_1B1234VAAAA0.h5 **	HDF5	Yes	Image data and metadata

** The file name is defined as follows:

Important notes to the user:

The GDB support of GOSAT data products is read-only.
In CATALYST Professional Focus, after selecting the HDF5 file to load the data, you will see a popup window asking which image you want to load. One option is CAI500 and the other is CAI1500; these represent two groups of images with different resolutions. Focus will load the data based on the option you selected.
If you use EASI, Python, or a text-based application, the input file name can have the following formats.
- Input full path name plus “-CAI500” for an image with a resolution of 500 meters, or “-CAI1500” for an image with a resolution of 1500 meters. For example:
```
C:\data\ GOSATTCAI2009042323160410170_1BTRBPV00020.h5-CAI500
```
  or
```
C:\data\ GOSATTCAI2009042323160410170_1BTRBPV00020.h5-CAI1500
  
```
- You can also input the full GDB URI as a file name. For example:
```
file:/C%3A/data/GOSATTCAI2009042323160410170_1BTRBPV00020.h5?t=CAI500  
```
  or
```
file:/C%3A/data/GOSATTCAI2009042323160410170_1BTRBPV00020.h5?t=CAI1500
 
```

Data Product	Data Returned	Details
GOSAT image data	Three raster channels	These raster channels represent data set band1Image, band2Image, and band3Image. The rasters are spatially coincident and the ground sample distance of the image data is 500 meters.
GOSAT image data	One raster channel	This raster channel represents data set band4Image. The ground sample distance of the image data is 1500 meters.
Ephemeris data	One binary segment	The GDB returns ephemeris data as an orbit segment. This segment includes information about the satellite position, satellite altitude, IFOV, projection, sensor, orbit, and so on.
Geolocation data	One ground control point (GCP) segment	The geolocation of the image data is returned as a ground control point (GCP) segment. This information is stored as a data set: /Data/geolocation/height, /Data/geolocation/latitude, and /Data/geolocation/longitude. The number of points is number of lines times number of pixels. GDB only chooses 1024 points. The geolocation information allows the image to be accurately tied to particular points on the Earth’s surface.

GDB imports all metadata stored in the HDF5 file. The metadata shown below has been mapped to GDB metadata.

GDB imports all attributes attached to each image band as channel metadata.

Name	Description	Values
unit	Unit	String, length = variable
validRange	Valid range	16-bit unsigned integer array
Range	Minimum and maximum pixel values in the frame (except dummy)	16-bit unsigned integer array
dummy	Invalid value	16-bit unsigned integer
radianceScale	scale	32-bit floating-point
radianceOffset	offset	32-bit floating-point

For more information, refer to the GOSAT product format description by the National Institute for Environmental Studies GOSAT Project Office.