Super typhoon Haiyan makes landfall
Super typhoon Haiyan
Subscribe here to receive special images

SPOT 4

SPOT 4 is the fourth sun synchronous satellite of the SPOT series. SPOT 1, which was launched on 22 February 1986, and SPOT 2 (launched on 22 Jan 1990), and later SPOT 3 (launched on 26 Sept. 1993) have been providing high resolution images in two different modes (multispectral at 20m and panchromatic at 10m). The depointing capability up to 27° off nadir facilitates acquisition of stereoscopic images.

Images have a width of 60 km when they are taken at nadir. The spectral bands in multispectral mode are identical (except for the blue band which is not on the High Resolution Instruments) to the VEGETATION spectral bands, while in the "panchromatic" mode, the spectral band ranges from 0.61 to 0.68µm

Every area can be covered every 26 days (cycle duration) in the same geometric conditions, while using the off nadir capability, a mean access time of about 2.5 days can be obtained at equator.

The SPOT system is a cooperative effort of France, Sweden and Belgium who are now partners with the European Commission and Italy for the VEGETATION Programme.

Quick reference on SPOT 4
launch date 24 March 1998
Mission duration 5 yrs
Weight 2760 kg
Payload 1470 kg
Energy 2100 w
Orbit Period 101.46 mn
Inclination 98.72°
Excentricity 1.3 10-3
Number of revolutions per day 14 + 5/26
Cycle duration 26 days
velocity 7.4 km/s
Equator crossing time (descending node) 10:30 local solar time
Orbit characteristics at the equator at 45 ° latitude
Distance between successive ground tracks 2824 km 2000 km
Distance between adjacent ground tracks 108 km 76 km
Orbital altitude 822 km 832 km
Attitude control pointing < 0.15°
rate < 8 10-4 °/s
High Spatial resolution payload : 2*HRVIR
Swath 2* 60 km at nadir
Depointing up to 27° from nadir, laterally
Spatial resolution 20 m in multispectral mode
10 m in "panchromatic" mode
Spectral bands Multispectral mode 0.50 - 0.59 µm
0.61 - 0.68 µm
0.79 - 0.89 µm
1.58 - 1.75 µm
"Panchromatic mode" 0.61-0.68 µm
 

SPOT 5

SPOT 5 was launched on 3 May 2002

Click here for a detailed description of the high resolution system.

Quick reference on SPOT 5
launch date 3 May 2002
Mission duration 5 yrs
Weight 3000 kg
Payload  
Energy 2400 w
Orbit Period 101.46 mn
Inclination 98.72°
Excentricity 1.3 10-3
Number of revolutions per day 14 + 5/26
Cycle duration 26 days
velocity 7.4 km/s
Equator crossing time (descending node) 10:30 local solar time
Orbit characteristics at the equator at 45 ° latitude
Distance between successive ground tracks 2824 km 2000 km
Distance between adjacent ground tracks 108 km 76 km
Orbital altitude 822 km 832 km
Attitude control pointing < 0.15°
rate < 8 10-4 °/s
High Spatial resolution payload : 2*HRG + 2*HRS
Swath  2* 60 km at nadir
Depointing

HRG: up to 27° from nadir laterally

HRS: aft telescope: -20°, forward telescope: + 20°

Spatial resolution

HRG in multispectral mode:

3 channels at 10 m,

SWIR at 20 m

HRG: 2.5 or 5 m in "panchromatic" mode
HRS: 10 m in "panchromatic" mode
Spectral bands Multispectral mode 0.49 - 0.61 µm
0.61 - 0.68 µm
0.78 - 0.89 µm
1.58 - 1.75 µm
"Panchromatic mode" 0.49-0.69 µm