Global distribution of Clanwilliam cedar tree localities in 2013

This dataset accompanies the publication "Slingsby, J.A. and Slingsby, P.W.O. 2019. Monitoring the critically endangered Clanwilliam cedar with freely available Google Earth imagery. PeerJ" Please read the paper for details and cite it as the source. The All_Cedars_2_WGS84.kml dataset contains 13419 cedar tree localities that were mapped from the 2013 Google Earth imagery for the map "Slingsby, P., 2015. Hike the Cederberg Map, 2nd Edition." and used to test the utility of this method for monitoring the species. Note that trees with canopies <4m2 were not detectable (see paper for details). The data are mapped at a scale of 1:24 000 (20m horizontal mapping accuracy) and are available in Keyhole Markup Language (KML) format, unprojected, readily openable in Google Earth. "fieldtrees.gpkg" is a GeoPackage format file containing unprojected tree localities that were mapped in the field and includes tree health and size data.

本数据集配套发表于论文《Slingsby, J.A. 与 Slingsby, P.W.O. 2019. 利用免费谷歌地球（Google Earth）影像监测极度濒危的克兰威廉雪松（Clanwilliam cedar）. PeerJ》，详细信息请参阅该论文，并请以该论文作为数据源进行引用。

All_Cedars_2_WGS84.kml数据集包含13419处雪松分布点位，均基于2013年谷歌地球影像解译获取，用于绘制《Slingsby, P., 2015. Hike the Cederberg Map, 2nd Edition.》（即《塞德伯格徒步地图（第二版）》），同时用于验证本监测方法在该物种监测中的应用效能。需注意，冠幅小于4平方米的树木无法被检出（详细信息请参阅论文）。该数据成图比例尺为1:24000，水平制图精度为20米，以键孔标记语言（Keyhole Markup Language, KML）格式存储，未经过投影，可直接在谷歌地球中打开使用。

fieldtrees.gpkg为GeoPackage（地理包）格式文件，包含野外实地测绘的雪松分布点位，同时附带树木健康状况与尺寸相关的调查数据。