Spatial Features of Urban Expansion in Vietnam Based on Long-Term Nighttime Lights Data
Spatial Features of Urban Expansion in Vietnam Based on Long-Term Nighttime Lights Data
复制标题
基于长期夜间灯光数据的越南城市扩张空间特征
DOI：
10.3390/land11050601
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Zhengke Zhou
中科院分区：
文献类型：
--
作者：
Keyang Zhou;Yutian Liang;Chen Zhong;Jiaqi Zeng;Zhengke Zhou
作为一个发展中国家，越南自21世纪世纪以来经历了快速的经济发展。因此，了解其城市扩展的空间模式变得越来越重要。然而，这一奋进的关键挑战在于缺乏越南国家一级次级行政区划的国民核算数据，特别是长期纵向数据。夜间灯光（NTL）数据可以客观反映城市建成区人类开发建设的范围和强度，可以有效支持越南城市扩展过程的实证分析。本文利用互校模型对DMSP/OLS和VIIRS/NPP NTL数据的长时间序列进行了校正和拟合。在此基础上，进一步提取了2000年至2018年越南城市建成区的数据。结果如下。(1)越南的主要城市扩张集中在湄公河三角洲南部和北方红河三角洲，分别以胡志明市和河内市为代表。(2)越南城市NTL在南北三角洲地区具有显著的高-高集聚特征。2012年前主要城市扩展热点集中在胡志明市周边，2012年后以河内市为代表的北方地区逐渐转变为城市扩展热点聚集的关键区域。(3)工业化和全球化对越南城市化影响显著、耦合度高的城市集中在胡志明市、河内和部分北方三角洲省份，表明工业化和全球化对越南城市化的影响仍局限于部分地区。此外，研究结果还表明，人口规模和工业化水平是越南城市扩张的主要驱动力，而外资水平则显示出不太大的意义。研究结果有助于促进长时间序列NTL数据在城市扩展中的应用，并进一步分析越南城市格局变化及其背后的影响因素。
As a developing country, Vietnam has experienced rapid economic development since the 21st century. It is therefore becoming increasingly important to understand its spatial pattern of urban expansion. However, the key challenge in this endeavor lies in the lack of national accounting data for the sub-administrative divisions of Vietnam at the national level, especially longitudinal data over a long time series. The nighttime lights (NTL) data can objectively reflect the scope and intensity of human development and construction in urban built-up areas, which can effectively support the empirical analysis of the urban expansion process in Vietnam. This paper uses the intercalibration model to correct and fit the long time series of DMSP/OLS and VIIRS/NPP NTL data. Based on this, the data for the urban built areas of Vietnam from 2000 to 2018 are further extracted. The results are as follows. (1) The main urban expansion in Vietnam is concentrated in the southern Mekong Delta and the northern Red River Delta, represented by Ho Chi Minh City and Hanoi City, respectively. (2) Vietnam’s urban NTL has significant high–high clustering characteristics in the north-south delta regions. The main urban expansion hotspots were concentrated around Ho Chi Minh City before 2012, the northern region represented by Hanoi City was gradually transformed into a critical area that gathering urban expansion hotspots after 2012. (3) The cities with significant influence and high coupling degree of industrialization and globalization on the urbanization of Vietnam are concentrated in Ho Chi Minh City, Hanoi, and some northern delta provinces, showing that the impact of industrialization and globalization on urbanization in Vietnam is still limited to some regions. In addition, the results show that the size of the population and the level of industrialization are the main drivers of urban expansion in Vietnam, while the level of foreign investment shows little significance. The results are helpful for promoting the application of long time series NTL data in urban expansion and for further analyzing the urban pattern changes in Vietnam and the influencing factors behind them.