forms to sunsynchroneous and geostationary satellites. 
TABLE 5: PLATFORMS 
  
1. AIRCRAFT 
— LOW ALTITUDE 
OXYGEN PRESSURIZATION, MOTOR 
LIMIT LIMIT LIMIT 
5KM SKM 8KM 
- HIGH ALTITUDE 
JET LIMIT: U-2 
15 KM 25 KM 
2. ORBITAL PLATFORMS 
H=BETWEEN 150 AND 300KM MANNED UP TO SERVICEABLE 
10 DAYS 
  
3. SUNSYNCHRONEOUS SATELLITES 
H=ABOUT 800 KM UP TO 3 YEARS (ORBIT CONTROL] 
4. GEOSYNCHRONEOUS SATELLITES 
H = 36 000KM UP TO 3 YEARS (ORBIT CONTROL) 
Table 6 shows that a satellite system is therefore built of sensors and platforms for 3 diffe- 
rent types of purposes: meteorology, remote sensing and cartography. 
TABLE 6: SYSTEMS 
  
1. METEORCLOGICAL SATELLITES 
— LOW SPATIAL RESOLUTION 
— HIGH REPETITIVITYY 
METEOSAT EVERY 30MIN ) 1-5KM SPATIAL RESOLUTION 
NOAA TWICE DAILY  ) 
2. REMOTE SENSING SATELLITES 
— MEDIUM SPATIAL RESOLUTION 
— MEDIUM REPETITIVITY 
LANDSAT MSS 10-30 ) 30-120M SPATIAL RES. 
TM DAYS ) 
3. CARTOGRAPHIC SATELLITES 
— HIGH SPATIAL RESOLUTION 
— STEREO VIEWING CAPABILITY 
— LOW REPETITIVITY 
SPOT EVERY 28 (5) DAYS ) 
CAME RA SYSTEMS FROM SPACE ) 10M.SPATIAL RES & BETTER. 
YEARS 
Table 5 summarises the limitations of the various platforms from aircraft to orbital plat- 
      
   
  
  
   
  
   
  
  
  
  
  
   
  
  
  
   
  
   
    
    
  
   
  
  
   
  
  
   
   
    
      
     
  
  
    
   
    
   
   
th 
Ic