ticular maximum return time 
key parameter within each 
)f the degree of latitudinal 
rbit and system parameter 
ipplication area are given in 
nporal requirements without 
re used synergistically. The 
;rve and monitor underlying 
;nts represent essentially the 
of features. For agriculture, 
seen at the time of critical 
nly the ‘weak’ requirement 
n be derived from SAR or 
iquirement in terms of the 
tisition is within this time 
irising from microwave and 
red to in Section 3.3. 
areas in Table 1, it can be 
day (for the areal extent of 
off after rain). Temporal 
ange from full snow cover 
>f soil moisture after heavy 
at the Feltwell and Vihti 
s observed in the Vihti test 
/th models in combination 
Vihti and Mali test sites, 
/ever, as soil moisture was 
iters may be masking the 
ral sampling requirements 
>it and system parameter 
l and 3, from which it can 
ed by consideration of an! 
l the optical instrument of 
and 35 day repeat periods 
tion sensor (e.g. AVHRR) 
latform mission scenarios 
: single-platform satellites 
vVielogorska A. and Rast 
esolution Optical Imager, 
k, The Netherlands. 
., 1993. Synergy in the 
art for ESTEC contract 
I 
. 
I 
I