threshold altitude 中文意思是什麼
threshold altitude
解釋
閾限高度-
The result corrected by former result was to judge the land to be suitable for cultivation or not. in the end, productivity index threshold under different suitable - levels was determined by analyzing the frequency histograms distribution of 4 productivity index. the result shows that the productivity index criteria of reserved land in beijing is that altitude 800 m, slope 15, soil depth 30 cm and gravel content 15 %
在生產性指標方面,以北京市土地開發復墾潛力調查評價為基礎,運用相關分析、主成分分析確定指標為海拔、坡度、土層厚度和礫石含量;對指標進行聚類,根據聚類結果對原有評價結果進行修正並判定后備土地資源的宜耕性;通過分析多因素綜合作用下四項指標的頻率分佈情況,確定上述四個生產性指標在不同宜耕等級下的閾值。
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