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KOMPSAT-5


KOMPSAT-5 spacecraft

KOMPSAT-5 spacecraft, © KARI, SIIS, TAS-I


Mission and sensor parameters

KOMPSAT-5 (KOrea Multi-Purpose SATellite-5) is the first Korean SAR satellite designed and manufactured by the Korean space agency (KARI). KOMPSAT-5 payload includes the COSI (Corea SAR Instrument) multi-mode X-band (9.66 GHz) SAR instrument1,2,3.

Mission parameters

KOMPSAT-5 was launched on 22 August 2013. The satellite carries a X-band SAR instrument, Corea SAR Instrument (COSI), which provides imagery in all polarisations (HH,HV,VV,VH). In the Charter Governance KARI acts as mission owner of KOMPSAT-5.

Table 1 provides a summary of the KOMPSAT-5 mission.

Parameter Specifications
EO Mission KOMPSAT-5
Charter Owner Agency KARI
Providing Agency KARI, SIIS, TAS-i
Date of launch 2013-08-22
EOL date 2022-08-22
Design Life >5 years
Mission status Operational
Orbit Type Sun-synchronous
Nominal Altitude 550 km
Repeat Cycle 28 days

Table 1 - KOMPSAT-5 mission parameters.

Sensor specifications

Table 2 provides specifications of the Corea SAR Instrument (COSI) earth observation sensor on board the KOMPSAT-5 platform. COSI is a multi-mode X-band instrument provided by TAS-I (Thales Alenia Space-Italy)4.

Parameter Specifications
Center frequency 9.66 GHz (X-band)
Range Bandwidth 9-240 MHz
Look direction Right (nominal). Also in left looking mode
Incidence angle range 20-45 (nominal), 45-55 (extended)
Polarization Single Polarization selectable among: HH, HV, VH, and VV
Imaging Modes High Resolution (HR), Standard (ST), and Wide Swath (WS) imaging modes
Resolution 1 m (HR), 3 m (ST), 20 m (WS)
Swath width 5 km (HR), 30 km (ST), 100 km (WS)
Table 2: KOMPSAT-5 COSI sensor parameters.

Imaging Modes

KOMPSAT-5 COSI SAR imaging modes3 are:

  • HIGH RESOLUTION (HR), ENHANCED HIGH RESOLUTION (EH), and ULTRA HIGH RESOLUTION (UH),

  • STANDARD (ST), and ENHANCED STANDARD (ES),

  • WIDE SWATH (WS), ENHANCED WIDE SWATH (EW).

COSI imaging modes

Figure 1 - KOMPSAT-5 imaging modes (image credit: KARI, SIIS).

In the following Table 3 a brief summary of the main imaging characteristics of all Kompsat-5 modes is given.

Imaging modes Nominal access region Extended access region GSD (@ nominal incidence angle of 45°) Swath (@ nominal incidence angle of 45°)
Spotlight

mode

Ultra High Resolution (UH) 50.3° ~ 55° 46.3° ~ 50.3° 0.85 m 5 km
Enhanced High Resolution (EH) 40.9° ~ 55° 20° ~ 40.9° 1 m
High Resolution (HR) 20° ~ 45° 45° ~ 55°
Standard /

Strip mode

Enhanced Standard (ES) 28.8° ~ 55° 20° ~ 28.8° 2.5 m 30 km
Standard (ST) 20° ~ 45° 45° ~ 55° 3 m
Wide Swath

mode

Enhanced Wide Swath (EW) 20° ~ 55° - 20 m (L1C, L1D), 5 m (L1A) 100 km
Wide Swath (WS) 20° ~ 45° 45° ~ 55° 20 m

Table 3 - KOMPSAT-5 imaging modes parameters.

Default product

KARI contributes to the Charter with the provision of radiometrically calibrated, geocoded and georeferenced radar data from KOMPSAT-5 satellite. Imported Dataset in the ESA Charter Mapper from COS-2 are SAR Geocoded Terrain Corrected (GTC) L1D products. KOMPSAT-5 GTC L1D GTC SAR product provides Backscattering coefficient of the observed scene, multi looked (but for High Resolution Mode), with the Incidence Angles Mask (GIM layer).

Native format

KOMPSAT-5 GTC L1D acquisitions are provided to the Charter as a compressed archive containing:

  • an XML metadata file
  • a GeoTIFF file for single-band L1D product at chosen polarization
  • a GeoTIFF file of the GIM (Geocoded Incidence Mask)
  • a JPG file with a browse image
  • a PNG file with a quicklook
  • a KML file of Scene Quicklook Map Overlay

Ingested format

During the ingestion key information is extracted from product annotation and included in the STAC item of a KOMPSAT-5 dataset. Below is given an example of the information contained into the STAC item of a KOMPSAT-5 GTC ST product in VV polarization received during the Charter Activation 787 (COS-2 ID: 907-KARI-KOMPSAT5-urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml).

Properties

STAC item content about properties for a KOMPSAT-5 GTC ST Dataset is the following:

  "properties": {
    "platform": "kompsat-5",
    "mission": "kompsat-5",
    "instruments": [
      "cosi"
    ],
    "sensor_type": "radar",
    "gsd": 3,
    "datetime": "2022-10-09T23:19:07Z",
    "created": "2022-10-20T08:48:25.0059181Z",
    "updated": "2022-11-30T14:06:03.2721351Z"
    "title": "KOMPSAT-5 GTC ST VV 2022-10-09 23:19:07",
    "providers": [
      {
        "name": "KARI",
        "roles": [
          "licensor"
        ]
      }
    ],
    "license": "proprietary",
    "disaster:call_ids": [
      907
    ],
    "disaster:resolution_class": "HR",
    "cpe:cos2_id": "907-KARI-KOMPSAT5-urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml",
  }

View

STAC item content about View Geometry for a Kompsat-5 GTC ST Dataset is the following:

  "properties": {
    "view:incidence_angle": 37.64450498856029,
    "view:off_nadir": 34.14044541120529
  }

Satellite

STAC item content about Satellite for a Kompsat-5 GTC ST Dataset is the following:

  "properties": {
    "sat:absolute_orbit": 50150,
    "sat:orbit_state": "ascending"
  }

SAR

STAC item content about SAR for a Kompsat-5 GTC ST Dataset is the following:

  "properties": {
    "sar:instrument_mode": "ST",
    "sar:frequency_band": "X",
    "sar:polarizations": [
      "VV"
    ],
    "sar:product_type": "GTC",
    "sar:observation_direction": "right",
    "sar:center_frequency": 9.66,
    "sar:resolution_range": 3.769912456206589,
    "sar:resolution_azimuth": 2.561736484147257,
    "sar:pixel_spacing_range": 1.125,
    "sar:pixel_spacing_azimuth": 1.125,
    "sar:looks_range": 1,
    "sar:looks_azimuth": 1,
    "sar:looks_equivalent_number": 1,
  }

Processing

STAC item content about Processing for a Kompsat-5 GTC ST Dataset is the following:

  "properties": {
    "processing:level": "L1D"
  }

Geometry

STAC item content about Geometry for a Kompsat-5 GTC ST Dataset is the following:

  "geometry": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          100.4407808877117,
          13.829065567495038
        ],
        [
          100.43878245924638,
          13.499942034214016
        ],
        [
          100.7740751312714,
          13.497794095861195
        ],
        [
          100.77653873162318,
          13.826863276312572
        ],
        [
          100.4407808877117,
          13.829065567495038
        ]
      ]
    ]
  },
  "bbox": [
    100.43878245924638,
    13.497794095861195,
    100.77653873162318,
    13.829065567495038
  ]

Assets

STAC item content about assets (annotation, quicklooks and spectral bands files harvested from the source product) and EO bands for a Kompsat-5 GTC ST Dataset is the following:

  "assets": {
    "thumbnail": {
      "type": "application/octet-stream",
      "roles": [
        "thumbnail"
      ],
      "title": "Acquisition Thumbnail",
      "href": "https://.../907-KARI-KOMPSAT5-urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml/thumbnail"
    },
    "overview": {
      "type": "application/octet-stream",
      "roles": [
        "overview"
      ],
      "title": "Acquisition Overview",
      "href": "https://.../907-KARI-KOMPSAT5-urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml/overview"
    },
    "enclosure": {
      "type": "application/octet-stream",
      "roles": [
        "data"
      ],
      "title": "Acquisition Enclosure",
      "href": "https://.../907-KARI-KOMPSAT5-urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml/enclosure",
      "file:size": 1013946225,
      "filename": "urn_ogc_def_EOP_KARI_KOMPSAT5_K5_20221009231907_000010_50150_A_ST08_VV_GTC_B_L1D_Aux_xml-product.zip"
    }
  }

Product Calibration

For KOMPSAT-5 products calibration refer to the Radar Products Calibration (SAR-Calib) service and the calibration sheet available here.


  1. KOREA AEROSPACE RESEARCH INSTITUTE, SI IMAGING SERVICES Co. LTD, "KOMPSAT-5 PRODUCT SPECIFICATIONS, Standard Product Specifications", Version 1.2, July, 2015. 

  2. KOREA AEROSPACE RESEARCH INSTITUTE, SI IMAGING SERVICES Co. LTD, "KOMPSAT-5 PRODUCT ATTRIBUTES, Product Attributes Specifications", Version 1.2, July, 2015. 

  3. KOREA AEROSPACE RESEARCH INSTITUTE, SI IMAGING SERVICES Co. LTD, "KOMPSAT-5 Image Data Manual", Version 1.0 April,201. 

  4. THE CEOS DATABASE, CEOS EO HANDBOOK, MISSION SUMMARY - KOMPSAT-5, available at http://database.eohandbook.com