| 2000-2016年中国地级以上城市高精度城区边界遥感提取及时空扩展分析 |
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| 引用本文： | 宁晓刚,王浩,张翰超,刘娅菲,庞博,郝铭辉. 2000-2016年中国地级以上城市高精度城区边界遥感提取及时空扩展分析[J]. 武汉大学学报(信息科学版), 2018, 43(12): 1916-1926. DOI: 10.13203/j.whugis20180183 |
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| 作者姓名： | 宁晓刚 王浩 张翰超 刘娅菲 庞博 郝铭辉 |
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| 作者单位： | 1.中国测绘科学研究院, 北京, 100830 |
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| 基金项目： | 国家重点研发计划2016YFE0205300国家自然科学基金41401513中央级公益性科研院所基本科研业务费项目7771803城市空间信息工程北京市重点实验室经费2018202国家测绘地理信息局青-带头人基金E1704 |
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| 摘 要： | 城区边界和城区面积是城镇化的重要表征和扩展分析的基础。然而城区边界存在概念和提取标准不统一、精度较低、可比性较差等问题。为此，提出了基于高分辨率影像和地理信息资料辅助的城区半自动化提取方法，充分利用高分辨率影像上的城市景观特征、先验地理信息知识和一系列标准规则，以得到精度高、一致性强的数据。以中国337个地级以上城市为研究区，采用该方法得到了2000年、2005年、2010年、2016年4期城区边界成果，并开展了城区时空扩展及用地效率等相关分析。结果表明:①16年间城区扩展迅速，城区主要集中分布在东部和中部，东西部地区差异大；②城市用地效率与城镇化发展水平显著相关，城区扩展以外延型为主；③大多城市城区扩展超前于人口增长，少量城市城区扩展滞后于人口增长；④城区扩展以占用耕地为主。
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| 关 键 词： | 城区边界 城市扩展 高分辨率遥感影像 地级以上城市 |
| 收稿时间： | 2018-05-14 |
High-Precision Urban Boundary Extraction and Urban Sprawl Spatial-Temporal Analysis in China's Prefectural Cities from 2000 to 2016 |
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| Affiliation: | 1.Chinese Academy of Surveying and Mapping, Beijing 100830, China2.School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China3.Beijing Key Laboratory of Urban Spatial Information Engineering, Beijing 100038, China |
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| Abstract: | Urban boundary and area is an important indicator for urban sprawl analysis. However, concept and extraction standard of urban boundary were inconsistent, and the resolution of images was coarse, resulting in lower precision and incomparable urban boundary. To solve above problems, a semi-automatic method of urban boundary extraction is proposed by using high-resolution image and geographic information data. Urban landscape and form characteristics, geographical knowledge, and a series of standardized rules are combined to generate high-precision and consistent urban boundary. Urban boundaries of China's 337 prefectural cities in year 2000, 2005, 2010 and 2016 are extracted with above-mentioned method. Together with other thematic data, urban sprawl is analyzed. Results show that: ① China's prefectural cities has undergone a rapid urbanization from year 2000 to 2015 with a high degree of concentration and regional differences. ②The efficiency of urban land use is significantly related to the development level of urbanization. The sprawl models of most cities are extensive. ③Most cities are faced with the problem that urban expansion is ahead of population growth, while a few cities expansion lag behind population growth. ④Cultivated land is the main source of urban expansion areas. |
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