SpaceEye-T

Key file name (use to open data set)	DIM_ST1_*.XML
Supported file extensions	.XML, .TIF, .JP2, .TXT

Sensor	EOS (Electro-Optical Sensor)
Platform	SpaceEye-T
Data distributor	Satrec Initiative (SI)
Sections	Data product name and description Distribution disk files Returned data References

Data product name and description

SpaceEye-T is a high-resolution remote sensing satellite owned and operated by the Korean satellite manufacturer Satrec Initiative (SI), which provides 25 cm panchromatic and 1.0 m multi-spectral imagery. The first SpaceEye-T (ST-1) was launched into a sun synchronous low Earth orbit on March 15, 2025, and the launch of three more satellites are planned by the end of 2028.

For more information; please see documentation in the References section.

SpaceEye-T sensor spectral bands are described in the following table:

Spectral bands: Spectral range (nm)	Spatial resolution (m)* (Ground sampling distance)	Swath width	Notes
Panchromatic (PAN): 450 - 800 nm	0.25 m	12km at nadir	Viewing angle: Roll: +/-45 deg Pitch: +/-30 deg
Multispectral (MS): Blue 450 - 520 nm Green 520 - 590 nm Red 630 - 690 nm NIR 770 - 890 nm	1.0 m	12km at nadir	Viewing angle: Roll: +/-45 deg Pitch: +/-30 deg
Pan-sharpened (PSH)	0.25 m		Pan-sharpened MS (R,G,B,NIR)
Bundle (PAN + MS)			PAN + MS (R,G,B,NIR)

* Resolution is always nadir position unless noted otherwise.

There are 3 geometric processing options for SpaceEye-T image data: SEN, PRJ, and ORT products. All three products are corrected for non-uniformity sensor radiometric and distortions. See descriptions in the following table:

Processing level	Description/notes
SEN	Sensor (SEN) is the product corrected for radiometric and sensor distortions. The difference of relative radiometric response between detectors is corrected and internal detector geometry and mis-registrations between detectors are corrected when applicable. Non-uniformity correction including Inter-detector equalisation Sensor geometry correction Band registration MTF compensation RPC included
PRJ	Projected (PRJ) is the so-called ortho-ready processing option. Processing for PRJ includes all radiometric and sensor corrections applied to SEN product. All processing for SEN product Corrections for optical distortion and terrain effects made with average height of strip Final PRJ product projected to UTM coordinate
ORT	Orthorectified (ORT) is the product corrected for geometric distortions and projected to UTM. All processing for SEN product Corrections for optical distortion and terrain effects made using coarse DEM, namely SRTM DEM Final ORT product projected to UTM coordinate

SpaceEye-T supports four imaging acquisition modes:

Single Strip Imaging (SSI): The basic imaging mode to be used to collect images over multiple targets in the direction of satellite trajectory. ST-1 can collect images up to about 1,500 km long, and can collect typically image from 4 targets over 300 km x 500 km area and collect up to 5 images over the same target.
Single Pass Stereo Imaging (STI): For DSM/DEM; Mode to collect the stereo image of a target during a single pass. ST-1 can provide a single pass stereo up to 85km with B/H of 0.5 in along track direction.
Wide Area Imaging (WAI): For single-pass mosaic; To have wider swath using satellite agility. The wide area along imaging encompasses the imaging of up to 5 consecutive strips, lying side by side with pitch angle less than 30 degrees. Number of strips include:
- 3 (Swath = 36.0 km, maximum length = 128 km, area covered = 4,608 km^2),
- 4 (Swath = 48.0 km, maximum length = 57 km, area covered = 2,736 km^2), and
- 5 (Swath = 60.0 km, maximum length = 21 km, area covered = 1,260 km^2)
Arbitrary Inclined Strip (AIS) Imaging: To take images over linear features such as coastlines, borders, pipelines, rivers, roads, etc.

Distribution disk files

File name	File type	Required	Contents/details
DIM_*.XML	Extensible Markup Language	Yes	Key file name, contains dataset metadata
IMG_.TIF IMG_.JP2 IMG_*.J2W	Tagged Image File Format Joint Photographic Experts Group 2000	Yes – either TIF or JP2	Image data
RPC_*.XML	Extensible Markup Language	Yes – for SEN and PRJ products only	Rational function model
PREVIEW_*.XML	Extensible Markup Language	Optional	Thunbnail file

Returned data

The data structure, after it is opened by GDB, is as described in the following table.

Data product	Data returned	Details/notes
SEN (Multispectral) PRJ (Multispectral) ORT (Multispectral)	4 x [16U] raster channels 1 x [BIN] Rational Function Segment	Rational Function Segment only included with SEN and PRJ products
SEN (Panchromatic) PRJ (Panchromatic) ORT (Panchromatic)	1 x [16U] raster channel 1 x [BIN] Rational Function Segment	Rational Function Segment only included with SEN and PRJ products
SEN (Pan-sharpened PSH) PRJ (Pan-sharpened PSH) ORT (Pan-sharpened PSH)	4 x [16U] raster channels 1 x [BIN] Rational Function Segment	Rational Function Segment only included with SEN and PRJ products
SEN (Bundle PAN + MS) PRJ (Bundle PAN + MS) ORT (Bundle PAN + MS)	4 x [16U] raster channels (MS) / 1 x [16U] raster channel (PAN) 1 x [BIN] Rational Function Segment	Rational Function Segment only included with SEN and PRJ products

References

SpaceEye-T User Guide – Image Data Manual, Version 0.5, June, 2025.

For more information, go to: Satrec Initiative