TITLE:
Characteristics Analysis of Urban Space Expansion in Luoyang, China
AUTHORS:
Kaiguang Zhang, Hongling Meng, Mingting Ba, Yanmin Sun
KEYWORDS:
Urban Space Expansion, Compaction Index, Expand Intensity Index, Expand Orientation, Centroid Migration, Luoyang
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.1,
January
19,
2022
ABSTRACT: The characteristics of urban space expansion reflect the changes of urban
space layout and space structure, as well as the urban developing direction and
urban orientation in the future. Based on the remote sensing image data of
1990, 2000, 2010 and 2020, this paper analyzes the urban space expansion
characteristics of Luoyang, by using the urban land compaction index, expansion
intensity index and centroid distribution in 4 time sections and 3 periods. The
results show that: 1) the urban land area of Luoyang has expanded rapidly, the
urban planning policy has successfully guided the urban expansion. 2) In the
first period, the urban expansion belongs to the rapid expansion type, mainly
filling the built-up area and natural expansion to outward; the second period
is of high-speed expansion type, the urban expansion mainly enlarges the urban
framework, then fills the expanded district, and the influence of urban natural
growth factor is very small; the third period belongs to the high-speed
expansion type, and the expansion rate is significantly lower than that in the
second period, the urban expansion is mainly to fill in the urban framework
enlarged in the previous period and continue to enlarge the urban framework, and the influence of urban natural
growth factor is very little. 3) The
urban land centroid gradually migrates to the southeast with the azimuth of
151.47°, the annual migration distance is of 138.29 m. The
migration rate in the second period is the fastest, which is about 7.43 times
that of the first period, and 2.70 times that of the third period. In the first
period, the urban land is mainly expanded to southward, with the main azimuth
of 201.13°. Compared with the urban land centroid in 2000, the urban land in
the second period mainly expands to east-southeast and southward along the azimuths
of 141.92° and 154.17° respectively. Compared with the urban centroid in 2010,
the urban land in the third period mainly expands in the orientations of
southeast and eastward along the azimuth of 96.24° and 133.45°.