外资资产达外汇存底近3倍 台股震荡掀资金潮考验央行稳汇

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外资资产达外汇存底近3倍 台股震荡掀资金潮考验央行稳汇

瑞士森林地图在一个像元里标出多种树木

一些森林地图给每个像元只标一种优势树，少量混生的枫树、白蜡树等便可能在图上消失。研究者绘制了一幅覆盖瑞士的30米分辨率地图，估算十种主要树种和“其他”一类各自的树干断面积占比。模型结合航空照片、机载激光扫描、卫星观测表示及气候变量，用3992个森林清查点的实测资料训练。 Yixin Zhou等人的这项研究收录在11月6日更新的计算机科学预印本列表中。

在独立自然保护区数据上，系统在单个像元中找对优势类别的比例为73.2%，在样地尺度则为81.1%。地图还重现了从低海拔阔叶林到较高处云杉、再到林线附近落叶松和瑞士五针松的变化。对管理者来说，图中除主要树种以外的占比，可以补充地面清查点之间的空间信息。这些比例是模型估算，其精度随观察尺度而变。

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