S 
two 
F 
3oth 
der of 
2). 
(A) 1976 SITES (WEATHER: WARM; (B) 
, 197 : 
SEASON: EARLY) 978 SITES (SEASON: EARLY) 
spring 
ad; an 
1 ^ 
d? 
letely 
that 
els 
of 
an 
ion (C) 1977 SITES (WEATHER: COOL; (D) 1979 SITES (SEASON: LATE) 
SEASON: NORMAL TO LATE) 
S Figure 3. Site locations and meteorological summary for U.S. and Canada 
icy to spring small grains. 
] of 
he 
jround 12 
ional wl 
nents 
8} 
à crop eL 
T 
, AF 
. ul 
in Evol 
œ 
o 
2 Pa [| 
c 0 LI SITE GROUND TRUTH 
z 
x o 2} AUTOMATED 
FE TECHNIQUE 
)00 x | 
S A LEGEND 
AUTOMATED 
= sr TECHNIQUE AUTOMATED PREVIOUS 6€ MEAN ERROR WITH 
PREVIOUS TECHNIQUE RESPECT TO 
8} AUTOMATED PREVIOUS TECHNIQUE GROUND TRUTH 
TECHNIQUE PEEMIO0S, TECHNIQUE 
100} H 90% CONFIDENCE 
INTERVAL 
ture 32 
1976 1977 1978 1979 
YEAR 
Figure 4. Accuracy comparisons of spring small grains techniques. 
2371 
LR PRE) 4 p s 
LEE Ay Ge M REN o A