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left_on.gifKind of Earth Observation Satellite
spacer.gifsub_directry_end.gifSPOT
left.gifKind of sensor
spacer.gifsub_directry.gifSPOT HRVIR
spacer.gifsub_directry_end.gifSPOT HRV
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SPOT

Overview

The French earth observation satellites SPOT-1, 2, 3 and 4 were launched into a sun-synchronous sub-recurrent orbit at an altitude of about 822 km in 1986, 1990, 1993 and 1998 respectively. SPOT can observe not only the earth's surface just underneath the satellite but also slantwise to the satellite's path by changing the scan direction of the sensors. It can shorten the time period for observing a specified area repetitively.

SPOT-1, -2 and -3 are equipped with CCD sensors called High Resolution Visible Imaging System (HRV). SPOT-4 is equipped with two CCD sensors, HRV's successor, High Resolution Visible and Infrared (HRVIR) and Vegetation (VGT)*1.

The observation bands of HRVIR are basically same as HRV and the newly added band 4, short wave infrared (SWIR: 1.58 to 1.75mm). VGT observes wide area with a swath of 2,250 km.

*1 VGT data is not received, processed and provided by EOC.


Characteristic


Launched by Date of launch Date of termination Altitude Sensor Recurrent period
SPOT-1 CNES 1986.2.22 2002.2.4 822km HRV 26 days
SPOT-2 CNES 1990.1.22 Operating* 822km HRV 26 days
SPOT-3 CNES 1993.9.26 1997.11.14 822km HRV 26 days
SPOT-4 CNES 1998.3.24 Operating* 822km HRVIR/VGT 26 days
* : The data reception by EOC was finished to Mar 31, 2002.(detail)




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