Corylus avellana chorology

Distribution map of common hazel (Corylus avellana)

These maps were produced by combining numerous and heterogeneous data collected from atlas monographs providing complete species distribution maps, from national to regional atlases, occurrence geo-databases, scientific and grey literature.
The maps were created using ESRI shapefiles (*.shp, *.shx, *.dbf, *.prj files) archived in the ZIP file. Species range is mapped with polygon features (name suffix "plg"), which define continuous areas of occupancy of the species, and with point features (name suffix "pnt"), which identify more fragmented and isolated populations. If synanthropic occurrences are reported outside the species natural range, additional point and/or polygon shapefiles are also present (suffix "syn").
Polygon borders delimiting species ranges are generalized across the mainland and sea boundaries. This offers the possibility to mask sea areas or to clip and extract the terrestrial range parts using GIS data layers of the users' choice. An additional version of polygon ranges are clipped with a coastline (name suffix "clip"), which have been derived from Natural Earth dataset "Admin 0 - Countries" 1:50M version 4.1.0 (https://www.naturalearthdata.com).

Please cite as:
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007

Additional information and used references are on 'supplementary materials' document:
https://doi.org/10.6084/m9.figshare.5091901

Chorological maps are part of the "European Atlas of Forest Tree Species" project:
https://w3id.org/mtv/FISE-Comm/v01

普通榛树（Corylus avellana）的分布图谱

本图谱通过整合多源异构数据编制而成，数据来源涵盖从国家级到区域级的完整物种分布图集专著、物种出现点地理数据库、科学文献与灰色文献。

本图谱采用ESRI形状文件（*.shp、*.shx、*.dbf、*.prj）存储，并打包为ZIP压缩档案。物种分布范围通过两类要素进行表达：其一为面要素（文件名后缀为"plg"），用于定义物种的连续栖息区域；其二为点要素（文件名后缀为"pnt"），用于标识更为破碎且孤立的种群。若存在物种自然分布范围之外的人为伴生出现记录，还将附带额外的点或面形状文件（后缀为"syn"）。

用于划定物种分布范围的面要素边界已针对大陆与海洋边界进行概化处理，支持使用者通过自选的GIS数据图层遮蔽海洋区域，或裁切提取陆地分布范围的对应部分。另有一份面要素分布范围的附加版本，其已通过海岸线完成裁切（文件名后缀为"clip"），该版本的数据源自Natural Earth数据集"Admin 0 - Countries"1:50M 4.1.0版（https://www.naturalearthdata.com）。

引用格式如下：
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. 欧洲主要木本物种的分布区地图. Data in Brief 12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007

更多相关信息及引用文献可参阅《补充材料》文档：https://doi.org/10.6084/m9.figshare.5091901

本分布区地图是"欧洲林木树种图集"（European Atlas of Forest Tree Species）项目的组成部分：https://w3id.org/mtv/FISE-Comm/v01