International Archives of Photogrammetry and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE III, Vienna, 1999 
48 
I5PRS 
V®y 
UNISPACE III - ISPRS Workshop on 
“Resource Mapping from Space” 
9:00 am -12:00 pm, 22 July 1999, VIC Room B 
Vienna, Austria 
ISPRS 
Fig.l.a. 
The area estimation for winter wheat shows a strong 
relationship between the traditional (questionnaire) 
method and the remote sensing one. Data from 1999 are 
not public until the end 1999. 
Fig.l.b. 
The figures compare similarly to those of wheat. The 
relationship is affected by the practice and statistics of 
maize for silage. Only a part of maize is sown originally 
for ensilage. Many times arbitrary decisions are made 
along the season to ensilage maize. New methods suggest 
compensation to this effect. 
Maize county area assessment 
by remote sensing in 9 counties 
(from the 1991-1998 period) 
160,000 
140,000 
^ 120,000 
« 
s 
a 100,000 
ft 
0 
o 80,000 
X 
§ 60,000 
u 
40,000 
6.0 non 
20,000 
60,000 100,000 140,000 
FÔMI RSC crop area (ha) 
Fig. 2. a. 
The wheat yields can be predicted by remote sensing 
prior to the harvest. These years comprise good and 
extreme bad ones as well. 
Ü 1997 A 1998 
#• 1991-1996 
harvest. The sample comprises diverse years. No CSOH 
yield data are available to date for 1998.