Crop identification is the basic work in crop yield estimation.
作物识别是遥感作物估产的基础。
Firstly, the author extensively reviewed different crop yield estimation methods in this paper.
本文首先综述分析各类作物估产办法。
The paper inquired into the characteristic, system architecture of spatial data warehouse and valued crop yield estimation methods we have now.
为此，探讨了空间数据仓库的特征、体系结构，对现有农作物估产方法进行了评价。
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