KOMPSAT-2

Long name	KOMPSAT-2 Sensor Support
Short name	KO2M / KO2P
Key file name (use to open data set)	*.eph
Supported file extension(s)	.eph, .hdf, .tif

Sensor	Multispectral Camera (MSC) that produces both panchromatic (1m ground sample distance) and multispectral (4m ground sample distance) images with 10 bits per pixel quantization.
Platform	KOMPSAT-2 (Korean Multipurpose Satellite)
Data distributor	Distributed by SPOT Image (http://www.spot.com/html/SICORP/_401_402_1311_.php) and Korea Aerospace Industries (http://www.koreaaero.com/english/major/statellite.php) in Korea only.
Sections	Data product name and version Distribution disk files Returned data Returned file-level metadata References

Data product name and version

Name	Description
Processing Level 1R	Level 1R data that has been already radiometrically corrected, but not geometrically corrected. It is stored in TIFF format.
Processing Level 1G	Image data that has been geometrically corrected using KOMPSAT-2 ancillary data and stored in GeoTIFF format.
Processing Level 1R or Level 1G Fusion	The pansharpened image data using the panchromatic and multispectral bands of the MSC.

Distribution disk files

File Format	Distribution	Contents
TIFF	CD/DVD	Level 1R
GeoTIFF	CD/DVD	Level 1G
Text	CD/DVD	Ancillary text, ephemeris data, and RPC data when the image data is in TIFF or GeoTIFF format.
JPEG	CD/DVD	Browse and thumbnail images that are ignored by GDB.

KOMPSAT-2 data products can have multiple sensor directories. These directories can contain TIFF or GeoTIFF files. Directories containing TIFF or GeoTIFF files include image files and associated image bands, a browse image file, a thumbnail image, ancillary text file(s), and ephemeris data file(s). Also included is a readme.txt file with information about all of the files in the data distribution.

File Name	File Type	Required	Contents	Details
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrPAxx_tt.tif	TIFF or GeoTIFF	Yes	PAN image
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrMXAxx_tt.tif	TIFF or GeoTIFF	Yes	MS image
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrPMSAxx_tt.tif	TIFF or GeoTIFF	Yes	Pansharpened image
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrPAxx_tt.txt	Text	Yes	Ancillary text files of PAN image	TIFF and GeoTIFF only
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrMXAxx_tt.txt	Text	Yes	Ancillary text files of MS image	TIFF and GeoTIFF only
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrPAxx_tt.eph	Text	Yes	Ephemeris data file of PAN	TIFF and GeoTIFF only
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrMXAxx_tt.eph	Text	Yes	Ephemeris data file of MS	TIFF and GeoTIFF only
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrTtt_br.jpg	JPEG	No	Browse
MSC_YYYYDDHhmmss_nnnn_PPPPrrrrTtt_tn.jpg	JPEG	No	Thumbnail

MSC is the sensor code that GDB uses to identify the KOMPSAT product.

YYMMDDHhmmss is the scene center time expressed in UTC.

nnnnn is the orbit number.

PPPP is the path number.

rrrr is the first row number.

RRRR is the last row number.

T is P(Pan only) M(MS only) B(Pan+MS).

A is P(positive), N(negative) tilt angle.

xx is the tilting angle(first two digits).

tt is 1R or 1G.

P is P(Pan only).

MX is M(MS only)X(1,2,3,4).

PMS is Pansharpened.

Important notes to the user:

The GDB support of KOMPSAT-2 data products is “read-only”.

KOMPSAT-2 data sets can be distributed on CD or DVD. On disk, the data is organized in a special directory structure. GDB uses this directory structure and the file names to identify the data product type. Therefore, to preserve compatibility with GDB, the directory structure and file names must not be altered when the data is copied over to another location from the CD or DVD.

There are two ways to open a KOMPSAT-2 data set in a file selector:

If you choose a directory name, GDB is provided with the path name of the data set root directory. Applications that use GDB to process KOMPSAT-2 data sets allow a directory name that represents the data set to be specified. In this case, GDB will open the whole data set including PAN and MS data.
You can also choose an EPH file in the data directory. If you select the EPH file that belongs to the MS data set, you’ll get the MS data set. If the EPH file is from the PAN data set, you’ll get the PAN data set. If the EPH file is from the PMS data set, you’ll get the pansharpened data set.

If GDB is provided with the path and name of a TIFF or GeoTIFF file in the data set, it will not recognize the file as part of a KOMPSAT-2 data set and will, therefore, open the file as an independent TIFF or GeoTIFF file; all other files in the data distribution will be ignored.

If you use EASI, Python, or a text-based application, the input file name can have the following formats:

Input the full path name plus “\-PAN” for Panchromatic image; “\-MS” for Multispectral image and “\-PMS” for Pansharpened image. For example: “E:\data\2008-11-19T08-10-07Z_K080307\-PAN” or “E:\data\2008-11-19T08-10-07Z_K080307\-MS” or “E:\data\2008-11-19T08-10-07Z_K080307\-PMS”.
Input the full path and name of EPH file. For example: “E:\data\2008-11-19T08-10-07Z_K080307\MSC_080407140610_09045_24220801PMSN14_1G.eph”. GDB can recognize the image type and open it relatively.
Input the full GDB URI as file name; for example: PAN: file:/E%3A/project/…/SCENE_001/?t=PAN MS: file:/E%3A/project/…/SCENE_001/?t=MS PMS: file:/E%3A/data/…/2008-11-19T08-10-07Z_K080307/?t=PMS

Returned data

Data product	Data returned	Details
MSC panchromatic image data	One raster channel	This raster channel has 15000 pixels and 15000 lines. The ground sample distance of the image data is one meter. The returned channel description consists of the file base name and a description that is stored in the file.
MSC multispectral image data	Four raster channels	These raster channels each have 3750 pixels and 3750 lines. The rasters are spatially coincident and the ground sample distance of the image data is four meters. The channels contain images for green, blue, near-infrared, and red wavelength bands (called the MS1, MS2, MS3, and MS4 bands, respectively). The channel description that is returned for each channel has the same parts as the Panchromatic channel description.
MSC pansharpened image data	Four raster channels	These raster channels are generated by combining panchromatic and Multispectral data. The returned channel description consists of the file base name and a description that is stored in the tiff file.
Geolocation data	One ground control point (GCP) segment	This segment contains the georeference for the panchromatic multispectral image channel. This data is extracted directly from a TIFF or GeoTIFF data distribution file.
Ephemeris data	One binary segment	GDB imports EPH data as a satellite position: EPH_PAD_RPY_DEG and EPH_SUN_ANGLE_DEG metadata. GDB uses this metadata along with projection information to generate an orbit segment.
RPC data	One binary segment	GDB imports a Rational Function model as a binary segment if the data product provides this information.
General information and metadata	Text segment	The KOMPSAT-2 data product also includes a text file that contains general information. GDB imports this data as a text segment.

Returned file-level metadata

Name	Description	Values
MD_PlatformName	Platform name	“KOMPSAT-2”
MD_PlatformNumber	Platform number	“2”
MD_ImageName	Full name of the type of the image	“Panchromatic” or “Multispectral” or "Pansharpened"
MD_SourceID	Data file name	See Distribution Disk Files section
MD_Acquisition_Date	Acquisition Date	YYMMDD
MD_Acquisition_DateTime	Acquisition Date/Time	UTC Center Time, YYMMDDHhmmss
OrbitNumber	Orbit number	5-digit positive integer
PathNumber	Path number	4-digit positive integer
RowNumber	Row number	4-digit positive integer
ImageCode	Short code for the sensing modality	“M” (for multispectral) or “P” (for panchromatic) and "PMS" (for pansharpened)
MD_ProductType	Processing level	“L1R” or “L1G”
Tilting	Tilting angle	“P” (for positive) or “N” (for negative) followed by a two-digit integer
MD_SpatialResolution	Ground sample distance	1m PAN or 4m MS
MD_SpatialResolutionX	Ground sample distance in x direction	1m PAN or 4m MS
MD_SpatialResolutionY	Ground sample distance in y direction	1m for PAN or PMS and 4m for MS
MD_SensorModelName	Platform name and modality	“KOMPSAT-2_PAN” or “KOMPSAT-2_MULTI” Pansharpened data does not have this metadata.
MD_SensorCode	Code for the sensing modality	“PAN” or “MS” Pansharpened data does not have this metadata.
MD_IFOV	Instantaneous field of view	1.459e-6 radian
MD_RawCount	Number of lines in the image	15000 for panchromatic and 3750 for multispectral
MD_ColumnCount	Number of pixels in the image	15000 for panchromatic and 3750 for multispectral
MD_NumberofBands	Image Number of Bands	Number of bands in a data set
MD_FormatName	Name of the file format	TIFF or GeoTIFF

Returned metadata items that relate to EPH data:

Name	Description	Values
IMG_ACQISITION_START_TIME		yyyy mm dd hh mm ss.ssss
IMG_ACQISITION_END_TIME		yyyy mm dd hh mm ss.ssss
MD_SatPosition	Satellite Position	Time;X;Y;Z;X’;Y’;Z’...;all float value. The unit is expressed in meters and the coordinate frame in ECEF.
EPH_PAD_RPY_DEG	Satellite Pad	X; Y; Z; float value, where the unit is expressed in degrees.
EPH_SUN_ANGLE_DEG	Sun Angle	X; Y; Z; float value, where the unit is expressed in degrees.
RPC_SCALE_LINE	RPC information	Integer, pixel
RPC_SCALE_SAMPLE	RPC information	Integer, pixel
RPC_SCALE_LAT_DEG	RPC information	float, degree
RPC_SCALE_LONG_DEG	RPC information	float, degree
RPC_SCALE_HEIGHT_METER	RPC information	float, meter
RPC_OFFSET_LINE	RPC information	integer, pixel
RPC_OFFSET_SAMPLE	RPC information	integer, pixel
RPC_OFFSET_LAT_DEG	RPC information	float, degree
RPC_OFFSET_LONG_DEG	RPC information	float, degree
RPC_OFFSET_HEIGHT_METER	RPC information	float, meter
RPC_COEF_NUME_LINE	RPC information	float
RPC_COEF_DENO_LINE	RPC information	float
RPC_COEF_NUME_SAMPLE	RPC information	float
RPC_COEF_DENO_SAMPLE	RPC information	float
AUX_SATELLITE_NAME	AUX information	string
AUX_SATELLITE_SENSOR	AUX information	string
AUX_TILT_ANGLE_ROLL_DEG	AUX information	float, degree
AUX_TILT_ANGLE_PITCH_DEG	AUX information	float, degree
AUX_BITS_PER_PIXEL	AUX information	integer
AUX_SAMPLES_PER_LINE_MS	AUX information	integer, pixel
AUX_LINES_PER_IMAGE_MS	AUX information	integer, pixel
AUX_SCENE_CENTER_XY_PIXEL	AUX information	integer, pixel
AUX_IMAGE_GSD_METER	AUX information	float, meter
AUX_LINE_SCAN_TIME_USEC	AUX information	float
MD_Azimuth_Angle	AUX information	float, degree
MD_Incidence_Angle	AUX information	float, degree
AUX_IMAGE_PAD_POD_FLAG	AUX information	Boolean
MD_MapProjection	AUX information	String
AUX_PROJECTOIN_PARAMETER	AUX information	String
MD_EllipsoidName	AUX information	String
AUX_RESAMPLING_NAME NONE	AUX information	String
AUX_LOCATION_KGRS_KJ	AUX information	integer
AUX_IMAGE_SHIFT_TO_ALONG	AUX information	integer
AUX_IMAGE_ORBIT_NUMBER	AUX information	integer
AUX_IMAGE_CENTER_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_CENTER_ALTITUDE	AUX information	float
AUX_IMAGE_TL_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_TC_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_TR_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_BL_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_BC_LATLONG_DEG	AUX information	float, degree
AUX_IMAGE_BR_LATLONG_DEG	AUX information	float, degree
AUX_STRIP_ACQ_DATE_UT	AUX information	long
AUX_STRIP_ACQ_START_UT	AUX information	float
AUX_STRIP_ACQ_CENTER_UT	AUX information	float
AUX_STRIP_ACQ_END_UT	AUX information	float
AUX_STRIP_ACQ_DURATION_SEC	AUX information	integer

References

For more information, refer to the KOMPSAT-2 user manual produced by the Korean Aerospace Research Institute Space Application Center. February 23, 2007.