THEOS-2

Key file name (use to open data set)	*.XML
Supported file extension(s)	.XML, .TIF, .JPG

Sensor	pushbroom scanner(Or linear array of sensors with Charge-coupled devices (CCDs))
Platform	THEOS-2
Data distributor	Geo-Informatics and Space Technology Development Agency (GISTDA), also known as the Thai Ministry of Science and Technology's Space Agency
Sections	Data product name and description Distribution disk files Returned data References

Data product name and description

Name	Description	Version
Level 1	Radiometric correction sensor distortions
Level 2(Primary product)	Accurate datation, scene extraction and bad detector and missing line interpolation/flagging Offset and gains correction using calibration files cosmic rays detection and correction Focal plane rearrangement (sub-swaths merging and sensor deformations) Satellite orbit and attitude correction Denoising and MTF enhancement (adaptive restoration) Resampling in the virtual perfect acquisition grid geometry Pixel radiometric value rounding (16 bits) RPC (Rational Polynomial Coefficients) generation
Level 2 Pansharpened	Pan sharpened of Level 2 image
Level 3 (Ortho or Projected) Image	Accurate datation, scene extraction and bad detector and missing line interpolation/flagging Offset and gains correction using calibration files cosmic rays detection and correction Satellite orbit and attitude correction Earth curvature and rotation correction Projection on UTM map (PROJECTED) or accurate DEM (ORTHO) Denoising MTF enhancement (adaptive restoration) Resampling in the corrected geometry Pixel radiometric value rounding (16 bits) RPC (Rational Polynomial Coefficients) generation for ortho on ellipsoid
Level 3 Pansharpened Image	Pan sharpened of Level 3 image

Note: Only Level 2A data has been tested.

Distribution disk files

File Name	File Type	Required	Contents
Image File: IMG_*.TIF	GeoTIFF	Yes	Image data
Metadada File: DIM_*.XML	DIMAP	Yes	Product annotation
PREVIEW_*.JPG	JPEG	No	Preview image
Mask File: CLD_MASK_*.TIF	TIFF	No	Cloud mask

Important notes to the user:

The GDB support of THEOS-2 data products is read-only.
THEOS-2 data sets can be distributed on CD or DVD. GDB uses the above file names to identify the data product type. Therefore, to preserve compatibility with GDB, the file names must not be altered when the data is copied to another location from the CD or DVD.
To load the data set, select the metadata (DIM_*.XML) file.

Returned data

Data Product	Data Returned	Details
THEOS-2 MS image data	Four raster channels	The rasters are spatially coincident and the ground sample distance of the image data is 2 meters. The channels contain images for blue(0.45um- 0.53um), green(0.53um - 0.60um), red(0.63um - 0.70um) and near-infrared(0.76um - 0.87um) wavelength bands.
THEOS-2 Pan image data	One raster channel	The ground sample distance of the image data is 0.5 meter. The channel contain panchromatic band with wavelength 0.45um - 0.74um.
THEOS-2 Pansharpened image data	Four raster channels	The rasters are spatially coincident and the ground sample distance of the image data is 0.5 meter. The channels contain images for blue(0.45um- 0.53um), green(0.53um - 0.60um), red(0.63um - 0.70um) and near-infrared(0.76um - 0.87um) wavelength bands.
Rational Functions Model data	One binary segment	This segment is only apply for level 2 primary product and level 3 projected product.

For more information, refer to the Thaichote product user guide by the Thai Ministry of Science and Technology's Space Agency.

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