International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
proportion monitoring results accounted out nearly the same 
time getting of the crop type proportion data. 
  
\ : 
Sichuan \ Hubei 
   
Chongqing / 
i 
   
Jiangxi 
Hunan a 
Fujian FS 
Yunnan pud m 
CUT Guang | fo Guangdong m 
   
Guizhou / 
» Taman 
  
Early rice distributing northern boundary 
Provincal boundary 
Hainan 
Radarsat 4 
  
  
  
Figure 3 Images used for early rice area estimation in 2003 
Rice area estimation was first on strata level and then deduced 
to city level. At last, rice areas of every province were summed 
up based on the data of every city. And the results showed that, 
rice area in 2003 was 5,941,000 hectares in China (See table 3). 
  
  
Provihce Rice Field Crop Croptype Rice area 
(Hectares) Proportion Proportion (Hectares) 
Anhui 1,679,473 0.2256 -- 378,889 
Fujian 1,035,038 : 0.7322 0.5315 402,800 
Guangdong 2,103,162 (1.6929 0.5691 829,339 
Guangxi 2,305,494 0.7878 0.5404 981,511 
Hainan 304,861 0.6394 0.5508 107,366 
Hubei 1,411,893 0.6861 0.4145 401,526 
Hunan 3,111,682 0.8197 0.545 1,390,102 
Jiangxi 32,336,135 0.8527 0.5354 1,066,812 
Yunnan 669,415 0.2487 0.1941 32,314 
Zhejiang 1,958,220 0.1758 -- 344,255 
Subtotal 16,215,992 -- -- 5,934914 
China 204,937,519 -- -- 5,941,568 
  
Table 3 Acreage estimated of early rice in 2003 
8. CONCLUSION 
Considered the properties of China crop planting system, 
CCWS suggested a special methodology to estimate crop area. 
After 6 years running of CCWS, we could draw such 
conclusions that, 
Supported by the crop stratification and 1:10,0000 scaled land 
resource database, CCWS use cluster sampling and remote 
sensing to estimate crop proportion, use transect sampling and 
GVG survey system to estimate crop proportion, then use arable 
area, crop proportion and crop type proportion to calculate crop 
area at strata level, at last account the crop area at city level and 
province level. This is a feasible way to estimate crop area in 
China with such a complex crop planting system. 
Crop proportion stratification is a valid method to increase crop 
area estimation accuracy. Through stratification, China planting 
area is divided into 102 strata, in every stratum, there has the 
same planting system, crop calendar and nearly the similar crop 
proportion. Stratification not only has reduced the sampling size 
of crop proportion and crop type proportion sampling, but also 
maintained a high accuracy of the sampling. 
Monitor crop proportion using cluster sampling technique and 
remote sensing, this avoided the full coverage images receiving, 
saved a large mount of input charges, meanwhile, sampling 
technique provided an effective utility to maintain the 
monitoring accuracy. Test results showed the monitoring 
precise are more that 97% high. 
Monitor crop type proportion using transect sampling and GVG 
survey system, this provided an effective sampling method to 
solve the ground survey works for China with such a far-flung 
crop area. Test results showed the monitoring precise is no less 
that 96% for high proportion crops. 
References from Journals: 
Li Qiangzi, Wu Bingfang, Crop proportion monitoring precise 
assessment (In Chinese), Journal of Remote Sensing, 2004 
Li Qiangzi, Wu Bingfang, Crop type proportion survey precise 
by transect sampling assessment (In Chinese), Journal of 
Remote Sensing, 2004 
Liew S C, Kam S, Tuong T et al. Application of Multitemporal 
ERS-2 Synthetic Aperture Radar in Delineating Rice Cropping 
Systems in the Mekong River Delta[J]. Vietnam, IEEE 
Transactions on Geosciences and Remote Sensing, 1998, 36(5): 
1412-1240. 
Wu Bing-fang. Operational Remote Sensing Methods for 
Agricultural Statistics [J]. (In Chinese) Acta Geographica 
Sinicai)2000:/155/]1L1023-35 
References from Books: 
Liu Jiyuan, China Land Resource Survey and Monitoring (In 
Chinese), Beijing! China Science and Technology Press! 1996 
Multiple frame agricultural surveys, Vol. I, Published by Food 
and Agriculture Organization of the United Nations, 1998 
Ripely,B.D.,1981,Spatial Statistics. Wiley, New York. 
Sun Jiu-lin | Pandect on dynamic monitoring and yield 
estimation for crop in China[M] (In Chinese), Beijing: China 
Science and Technology Press 1996 
Winter Wheat Remote Sensing Production Estimation 
Cooperation Team, Winter Wheat Dynamic Monitoring Using 
meteorological Satellite[M]! (In Chinese) Published by Beijing 
Press, 1993. 
Xu Xiru(ed.), Bulletin on environment monitoringand crop 
yield estimation with remote sensing[C], (In Chinese) Beijing: 
Beijing University Press,1991. 
References from Other Literature: 
Li Qiangzi, Wu Bingfang, Discrimination of Seed Rape and 
Winter Wheat using two-date ETM Data ‘! Proceedings of 
‘International Conference on Computer Graphics and Spatial 
Information System’, China Meteorological Press, 2002 
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