SPOT 4

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Satellite characteristics

Launch Date - End 24 maart 1998 - 1 januari 2013

Status Decommissioned

Orbit type Sun-synchronous circular orbit

Altitude 822

Orbit inclination 98.7

Equatorial crossing time 10:30:00

Orbit period 101.4

Satellite family: SPOT (Système Pour l'Observation de la Terre)

The SPOT Earth observation system was conceived and designed by CNES (Centre National d'Etudes Spatiales), the French space agency, and developed in association with the Belgian Science Policy Office (formely Federal Office for Scientific, Technical, and Cultural Affairs) and the Swedish National Space Board (SNSB).
More information:
SPOT 6 & 7 Technical Sheet (Airbus DS)
SPOT Programme (CNES)

Sensor characteristics

Sensor name HRVIR (High-Resolution Visible and Infrared)
Sensor short description

The HRVIR sensors are very similar to the HRV sensors of the previous generation (same spatial resolution and possibility of orienting the mirrors). However, they differ by:

  • the presence of an additional spectral band in the middle-infrared band;
  • the panchromatic (0.51-0.73 µm) band’s being replaced by the B2 (0.61-0.68 µm) band, which can function equally well in ‘10m’ and ‘20m’ mode;
  • onboard superimposition of all of the spectral bands.
Sensor type Imaging radiometer (Vis/IR)
Resolution class High (5 - 30 m)
Spatial resolution 10m (PAN)
20m (Multispectral)
Spectral bandwidth Multispectral B1 (green): 0,50 - 0,59 µm
B2 (red): 0,61 - 0,68 µm
B3 (near IR): 0,78 - 0,89 µm
MIR (middle IR): 1,58 - 1,75 µm
M - monospectral
PAN: 0,61 - 0,68 µm
Swath width (at nadir) 60 km
Revisit frequency 3 dagen
Max look angle 31°
Sensor name VEGETATION (Vegetation Monitoring Instrument)
Sensor short description

The VEGETATION programme was co-financed by the European Union, Belgium, France, Italy, and Sweden and being conducted under the supervision of the CNES (National Centre for Space Studies, France). The aim of the VEGETATION instrument is to provide accurate measurements of the main characteristics of the Earth’s plant cover. Practically daily global coverage and a resolution of 1 km make this sensor an ideal tool for observing long-term regional and global environmental changes.
VEGETATION worked independently from the HRVIRs. It includes a wide-angle radiometric ‘camera’ operating in four spectral bands (blue, red, near-infrared, and middle-infrared). Given its 2,250km swaths, this instrument is thus able to cover almost all of the Earth’s dry land in just one day.

Several products are available, including daily and ten-day synthesis products (at full resolution as well as 4km and 8km reduced resolutions) for the geographical areas that the user has defined as well as for complete global coverage. The SPOT VGT images are processed, archived and distributed for free by the CvB Product distribution portal.

Sensor type Imaging radiometer (Vis/IR)
Resolution class Very Low (> 1 km)
Spatial resolution 1165m
Spectral bandwidth B0: 0,43 - 0,47µm (blue) - Oceanographic applications/ Atmospheric corrections
B2: 0,61 - 0,68 µm (red) - Vegetation photosynthesis activity
B3: 0,79 - 0,89 µm (near IR)
MIR: 1,58 - 1,75 µm (middle IR) - Ground and vegetation humidity
Swath width (at nadir) 2250 km
Revisit frequency 1 dagen