Quercus ilex chorology

Distribution map of holm oak (<i>Quercus ilex</i>)<br><br>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 geodatabases and scientific literature.<br>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”).<br>All polygon borders delimiting the range are generalized across the mainland and sea boundaries, and not clipped to a specific coastline. 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. <br><br>Please cite as:<br>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 <br><br>Additional information and used references are on 'supplementary materials' document:<br>https://doi.org/10.6084/m9.figshare.5091901<br><br>Chorological maps are part of the "European Atlas of Forest Tree Species" project:<br>https://w3id.org/mtv/FISE-Comm/v01

冬青栎（*Quercus ilex*）分布地图

本数据集的地图通过整合多源异构数据制作而成，这些数据涵盖了从国家级到区域级的完整物种分布地图集专著、物种出现点地理数据库以及科学文献。

本数据集的地图以ESRI形状文件（ESRI shapefiles，格式为*.shp、*.shx、*.dbf、*.prj）打包存储于ZIP压缩包中。物种分布范围通过两类空间要素进行表征：其一为面要素（文件名后缀为“plg”），用于界定该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。若在该物种自然分布范围外存在人为伴生的出现记录，则会额外附带后缀为“syn”的点、面形状文件。

所有用于界定分布范围的面要素边界已针对陆地与海洋边界进行了概化处理，未针对特定海岸线进行裁切。这一设计允许使用者根据自身需求，通过地理信息系统（GIS）数据图层掩膜海洋区域，或裁切提取陆地分布范围部分。

请按以下格式引用：
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. 欧洲主要木本物种分布区地图. 数据简报（Data in Brief）12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007

更多信息及所引用的文献详见“补充材料”文档：
https://doi.org/10.6084/m9.figshare.5091901

本分布区地图集为“欧洲林木树种图集”项目的组成部分：
https://w3id.org/mtv/FISE-Comm/v01