Alnus incana chorology

Distribution map of grey alder (<i>Alnus incana</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 geo-databases, scientific and grey 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>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). <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灰桤木（*Alnus incana*）的分布地图 本数据集的分布地图整合了多源异构数据，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、科学文献以及灰色文献。 本地图以ESRI形状文件（shapefiles，*.shp、*.shx、*.dbf、*.prj）格式打包存储于ZIP压缩包中。物种分布范围通过两类要素进行可视化表达：其一为多边形要素（文件名后缀为"plg"），用于界定物种持续占据的连续分布区域；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。若在物种自然分布范围之外存在人为伴生的出现记录，则将附带额外的点和/或多边形形状文件（后缀为"syn"）。 用于界定物种分布范围的多边形边界已针对大陆与海洋边界进行了概化处理，这一处理使得用户可通过自选的地理信息系统（GIS）数据图层掩膜海洋区域，或裁剪提取陆地分布范围部分。此外还提供了经海岸线裁剪的多边形范围版本（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版本4.1.0（https://www.naturalearthdata.com）。 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 更多信息及所用参考文献可参阅《补充材料》文档：https://doi.org/10.6084/m9.figshare.5091901 分布区地图（chorological maps）属于"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