Gokturk-2

Long name Optical satellite Gokturk-2
Short name GK2
Sensor type

Pushbroom imager
Aperture diameter: 492 mm
Swath width: 20 km

Platform EOS-C sensor on Gokturk-2
Key file name (use to open dataset) *.package.xml
Supported file name extensions .xml, .tif, .jpg, and _rpc.txt
Sections

Data product name and description
Distribution disk files
Returned data for supported format
References

Data product name and description

Gokturk-2 is a mini-satellite built by the TÜBİTAK UZAY and Turkish Aerospace Industries Inc. (TAI) consortium. The satellite includes the Earth Observation Satellite - Camera (EOS-C) sensors, which is a multispectral pushbroom imager.

The data can be used for the following civil and defense applications:
  • Disaster and emergency response
  • Environment
  • Mapping
  • Urban planning
  • Land cover
  • Geology
  • Coastal-zone monitoring
  • Ecosystem
  • Water-resource management
Note: The information provided herein is based on the data distributor's documentation cited under References.

Spectral bands:
Spectral range (nm)

Spatial resolution (m)*
(spectral resolution)

Maximum image dimensions
(Across track x along track, km)

Notes

MS1 (Blue):  450 - 520
MS2 (Green): 520 - 600
MS3 (Red): 630 - 690
MS4 (NIR): 760 - 900
PAN (Panchromatic): 450 - 900

MS: 5
PAN: 2.5

Swath width: 20
Radiometric resolution: 11-bit

N/A

* Resolution is always nadir position unless noted otherwise.

Gokturk-2 image data is available at six different processing levels.

The following levels are supported:
  • Level 0 (L0)
  • Level 1 (L1)
  • Level 1R (L1R)
  • Level 2 (L2)
Processing level Horizontal accuracy (m) Description/notes
L0 N/A Raw image data
L1 N/A Radiometric correction applied
L1R N/A Band registration completed
L2 N/A Georeferenced imagery

Distribution disk files

A Gokturk-2 data set is organized in a specific folder structure on disk. GDB uses this folder structure and the file names to identify the data product type.

Warning: Data sets for this sensor are organized in a specific folder structure on disk. GDB uses this structure and the file names to identify the data product type. Do not alter the folder structure or any file names prior to data ingestion to ensure the image data and auxiliary information are imported correctly.

You can open a Gokturk-2 data set by selecting the *.package.xml file.

When opening a Gokturk-2 data set to run in CATALYST Professional, you will be prompted to select the MS or PAN data you want.

When opening a data set in a CATALYST Professional algorithm or command-line application, such as EASI, you must include the -MS or -PAN designator, as applicable, with the file name extension.

For example:
FILI=<path_name>\<file_name>.package.xml -MS			
FILI=<path_name>\<file_name>.package.xml -PAN			
			

When opening a Gokturk-2 data set, the files read by GDB are as described in the following table.

File name Format Required Contents/details
*.package.xml Extensible Markup Language Yes Key file name, contains data set metadata.
*.tif Tagged Image File Format (GeoTIFF) Yes Image data, one file per spectral band. Each spectral band is stored in a separate directory below the main *.package.xml file.
band.xml Extensible Markup Language Yes Each band directory includes a separate metadata file.
image_rpc.txt Text Yes Rational Function model, one file per spectral band.

Returned data for supported format

Gokturk-2 data can be opened directly in its raw vendor format or imported into a PCIDSK (*.pix) file using the key file name (*.package.xml). For optimal processing, use the PCIDSK format.

The following table describes the data structure after it is opened by GDB.

Data product Data returned Details

L0 (MS)
L1 (MS)
L2 (MS)

4 x [16S] Raster channels

1 x [ORB] Orbit segment
1 x [TXT] Product annotation data

N/A

L0 (PAN)
L1 (PAN)
L2 (PAN)

1 x [16S] Raster channel

1 x [ORB] Orbit segment
1 x [TXT] Product annotation data

N/A
L1R (MS)

4 x [16S] Raster channels

1 x [ORB] Orbit segment
1 x [TXT] Product annotation data
1 x [BIN] Rational function model

N/A
L1R (PAN)

1 x [16S] Raster channel

1 x [ORB] Orbit segment
1 x [TXT] Product annotation data
1 x [BIN] Rational function model

N/A

References

Teke, Mustafa. (2016). Satellite Image Processing Workflow for RASAT and Göktürk-2. Havacılık ve Uzay Teknolojileri Dergisi. 9.

For more information, visit: uzay.tubitak.gov.tr

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