Ash tree distribution in Great Britain 2007 View Service

This service displays a series of datasets consisting of mean estimate distribution maps of ash trees (Fraxinus excelsior) across Great Britain. It includes ash trees in areas less than half a hectare, ash trees in woody linear features and individual ash trees. The data are derived from Countryside Survey 2007. Trees were mapped in 569 1km sample squares across Britain using a stratified random sampling system based on the ITE Land Classification. Mean national estimates were produced by scaling up from the sample data.

本服务展示了一系列数据集，这些数据集包含了英国境内欧洲白蜡树（Fraxinus excelsior）的平均估计分布图。数据集涵盖了面积不足半公顷的欧洲白蜡树、木质线性特征中的欧洲白蜡树以及单株欧洲白蜡树。数据源自2007年的乡村调查。在英国的569个1平方公里的样本方格内，利用基于ITE土地分类的分层随机抽样系统对树木进行了测绘。通过将样本数据放大，产生了全国性的平均估计值。