Research On The Problem Of Population Distribution With Spatial Scales

The information of population distribution is important to comprehend man-land relationships, and it is one of the foundations to research the sustainable development of population, resources, environment, and economics. Based on the administrative distinction, this paper studied the issues of population distribution with different spatial scales. The population analytic units with different scales should reflect the differences of population distribution and the population data accuracy in these units should meet the requirement of this study. This paper preferably simulated the population distribution of Tianshui city, which is a hill and mountainous region in middle scale that had been identified early. The method is: self-apart plane interpolation was made through constructing Delaunay triangulation. On the base, data was picked up and grid data points were constructed. Then interpolation separated into slices was done by duality spline function, slippery and continuous bending surface was formed. Population distribution is provided with obvious dispersion and diversity speciality in hill and mountainous region there agriculture production is dominant. When distinguishing scale reduces from all territory, county, township to village in Tianshui city, the disproportion phenomena that population distribution is sparse or dense in space stands out more and more, cv. expands rapidly. Analyzing population distribution on hamlet scale approaches fact much more. In 7915 spots being composed of towns, villages and settlements, less spots with 1.0-10 hm~2 acreage account for 84.7%, this indicates dispersive and small scale villages are still primary form of population distribution. The relationships among population density and land-use proportion of villages, spot number on unit acreage and spot size are analyzed by non-linearity function, some characteristics and pattern in population distribution may be revealed well. Population distribution of Tianshui city represents obviously three categories: river valley area with high density, hilly area with medium density and mountainous area with low density. Labor radii and distance among villages have huge differences in three categories. In addition, for displaying the information of population distribution straightly, visually, exactly, this article brought forward and carried out the three dimension display of population distribution, which is easy to understand and make use of population information for people.