2026-10-11T22:50:24Z https://www.scidb.cn/oai

10.57760/sciencedb.IGA.00737 2023-11-06T16:05:33Z

2023-11-06 Helen City 1:250000 Population Spatial Dataset (1981) doi:10.57760/sciencedb.iga.00737 en a. Data content (data file/table name, including observation index content) Data File Name: Hailun City 1:250000 Population Spatial Dataset (1981) Main content: HlPopulation Data Entity. shp b. Construction purpose This dataset mainly provides data support for the study of the evolution and degradation process of black soil quality. c. Service object Students and researchers engaged in research related to population geography. d. Time range of data The data source was in 1981 and was produced in 2006. e. The spatial range and projection method of data Space scope: Hailun City, Heilongjiang Province Helen City; Population; 1981 杜书立 PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset Science Data Bank