— year 
'kable 
of ur- 
to do 
ble 2 
ate of 
adway 
jed to 
1 2796. 
hieve- 
dated 
3. 
  
      
Therefore we must find new technologies to progress. This is not new as can be seen in Table 
TABLE 3: EFFICIENCY OF CARTOGRAPHIC METHODS 
TERRITORY OF 
250 000 KM? 
(FED. REP. GERMANY) 
MAP 1: 50 000 
METHOD DURATION 
Terrestrial Surveys 
(Plane Table) 
1800 — 1900 1st Survey 
Photogrammetric Surveys 
(Aircraft) 
New Survey of Updating 
Satellite Mapping 
Estimate 
100 years 
10 years 
1 year 
  
While it took 100 years to survey the territory of the Federal Republic of Germany during 
the last century with ground survey methods, this is now possible to achieve by aerial photogram- 
metry in about 10 years. There is hope that the use of Satellite Imagery may again be able to 
speed up the process by a factor of 10, 
Figure 1 describes the different requirements for remote sensing satellites: 
  
TEMPORAL VERSUS 
SPATIAL RESOLUTION 
REQUIREMENT S 
  
  
  
TEMPORAL 
RESOLUTION 
100 YEARS 
10 YEARS A 
1 YEAR 
1 MONTH 
1 WEEK 
1 DAY 
  
  
  
1 HOUR 
Tree SPATIAL