— 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