International Archives of Photogrammetry and Remote Sensing. Vol. XXXII Part 7C2, UNISPACE HI. Vienna, 1999 
62 
ISPRS 
UNIS PACE III - ISPRS Workshop on 
“Resource Mapping from Space” 
9:00 am -12:00 pm, 22 July 1999, VIC Room B 
Vienna, Austria 
I5PR5 
Plant 
Year 
R.S. data (t/ha) 
Classical data (t/ha) 
Difference 
Rye 
1991 
2.52 
2.37 
+0.15 
1992 
2.34 
1.92 
+0.42 
1993 
1.84 
1.66 
+0.18 
Maize for 
1991 
26.5 
25.0 
+1.5 
Silage 
1992 
16.4 
14.0 
+2.4 
1993 
15.6 
16.1 
-0.5 
Red Clover 
1991 
3.86 
3.82 
+0.04 
1992 
2.70 
2.87 
-0.17 
1993 
2.20 
2.26 
-0.06 
Table 3. Estimated yield averages of ten crops for Hungary in 1991-93, using only low resolution satellite data ("robust" process) 
without actual ground truth data 
In every year it was possible to investigate tire yields of the 19 counties of Hungary separately too (see Table 2.). 
Year 
County 
R.S. data (t/ha) 
Classical data (t/ha) 
Difference (t/ha) 
1991 
Bekes 
7.17 
7.57 
0.40 
1991 
Hajdü 
7.32 
7.34 
- 
0.02 
1991 
Szolnok 
6.25 
7.06 
- 
0.81 
1992 
Bekes 
7.84 
3.47 
+ 
4.37 
1992 
Hajdü 
8.02 
4.12 
+ 
3.90 
1992 
Szolnok 
6.41 
3.39 
+ 
3.02 
1993 
Bekes 
7.45 
3.25 
+ 
4.20 
1993 
Hajdü 
9.28 
4.83 
+ 
4.45 
1993 
Szolnok 
6.62 
2.23 
+ 
4.39 
Table 4. Yield forecasting for com 
at the end of July (DOY=210) in 1991-93, 
in three counties 
1991: Normal year, in period DOY>210 the weather is normal. 
1992: Drought, in period DOY>210 (after DOY=225) a fast heavy draught appeared. 
1993: Drought in the whole year, after DOY=210 the aridity was stronger.