Distribution map of Persian walnut (Juglans regia)
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