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The distribution area of Medicago orbicularis (Round-pod alfalfa) .

Object description Download GIS-layers

Authors:

Experts N.I. Dzyubenko & E. A. Dzyubenko
GIS-expert A.N. Dzyubenko

Date of creation:

2.11.2003.

Scale:

1:20,000,000.

Accuracy of map:

Map was created using herbarium specimens and maps of scale 1:25,000,000-1:40,000,000.

The projection:

"Alber's Equal Area Conic for Russia", 9, 1001, 7, 100, 0, 44, 68, 0, 0.

Basic contents:

Vector map. Area of species distribution is shown by polygons, while actual location occurrence is shown by points.

Accuracy of classifier:

Point data were obtained from published sources and herbarium specimens. Light-colored points represent species locations referenced in published sources. Dark-colored points represent species locations reported in the VIR database (N.I. Vavilov Institute, 2003). Polygons are based on published sources, herbarium samples, and field surveys by the authors.

Method of map production:

Published literature was reviewed, including atlases, monographs and papers. Occurrence data were obtained from herbarium specimens, floras, monographs and papers. The following sources were consulted: Grossheim (1952), Mosel et al. (1965) and the VIR database (N.I. Vavilov Institute, 2003). Data were then compiled through scanning and geo-referencing to develop a composite vector map. The biologist, together with the GIS-specialist, drew a new plant distribution area based on compiled data.

Reference citations:

Grossheim A.A. 1952. Genus Medicago. Flora of the Caucasus. Vol. 5. Moscow-Leningrad: USSR, 177-194 p.
Mosel H. 1965. Comparative Chorology of the Flora of Central Europe. Jena. 583 p.
N.I. Vavilov Institute, Herbarium Department, 2003. Database of geographic coordinates (in house), St. Petersburg, Russia.

Rights and copyrights:

Copyright on the map and its description belongs to its authors.
Copyright on the photos belongs to N.I. Dzyubenko.