Impact of Reclamation in Coal Mining Subsidence Area on Urban Spatial Expansion of Huaibei City

Based on the GIS data platform,and taking the spatial analysis as the main means,this paper explored the impact of reclamation in coal mining subsidence area on urban spatial expansion of Huaibei City. The analysis took the time evolution of urban space development as the basis,took the sectors,circle rings and sub-district offices as the basic spatial units. From the aspects of urban expansion rate,expansion direction,function and construction intensity,it analyzed the impact of reclamation on the urban spatial expansion. In addition,it analyzed the correlation between the reclamation utilization of the subsidence area and the changes in spatial expansion. Finally,it summarized the characteristics of the impact.

Spatiotemporal Measurement of Regional Expansion in Changsha-Zhuzhou-Xiangtan Metropolitan Area Based on Nighttime Light Data

The research purpose is to accurately reveal the temporal and spatial law of the urban expansion of Changsha-Zhuzhou-Xiangtan, one of the seven major urban agglomeration areas in China, and provide decision-making basis for the future urban construction land layout and regional development policy-making. Based on the night lighting data (DMSP/OLS), this paper extracts the boundary of the urban construction land of Changsha-Zhuzhou-Xiangtan urban agglomeration from 1993 to 2017, and quantitatively studies the spatial and temporal characteristics of the expansion of the metropolitan area in the past 25 years according to the methods of spatial expansion analysis, center of gravity migration measurement, landscape pattern index, spatial autocorrelation, etc. The results show that: 1) it is scientific and feasible to extract urban agglomeration construction land by the method of auxiliary data comparison for the study of urban expansion;2) the expansion of regional space in Changsha-Zhuzhou-Xiangtan metropolitan area shows a trend of “weakening first and strengthening later”. The construction land keeps increasing, and the expansion form gradually changes from extensive type to intensive type;3) the center of gravity of the metropolitan area fluctuated and repeated in part during the past 25 years, but it was always located in the municipal district of Changsha city. The eastern region, mainly Changsha city, was still the core area of urban agglomeration expansion;4) strengthening the territorial space protection and control of ecological green core in the metropolitan area is a key measure for the high-quality development of urban agglomeration.

Quantitative Analysis of Spatial Vitality of Urban Built-up Area: A Case Study of Shenzhen

As an important goal of urban design research,the evaluation of urban spatial vitality has been widely concerned.Taking Shenzhen as an example,the urban built-up area of Shenzhen was identifi ed using improved DENsi-Graph analysis,from the perspective of quantifi cation of urban spatial morphological features.The accessibility of urban streets,degree of construction and architectural form,and degree of functional mixing were quantitatively analyzed through space syntax,space matrix and mixeduse index(MXI),and the spatial vitality of urban built-up area was evaluated.Research results demonstrated that the improved Densi-Graph analysis could better identify the built-up area of Shenzhen,and the overall classifi cation accuracy was 0.810.The analysis results of spatial vitality showed that the urban spatial vitality in Shenzhen urban built-up area was well created.The street accessibility of Shenzhen generally hindered the creation of urban vitality;the spatial matrix value in the north of Shenzhen urban built-up area was lower;and the MXI of most areas within the study area was above the medium.

Analyzing Urban Expansion and Spatial Growth Patterns in Barahathawa Municipality of Central Tarai Region, Nepal

The rapid transformation of rural settlements into municipalities in Ne­pal has brought significant changes in land use,and urban expansion and growth patterns mostly through the conversion of agricultural land into the built-up area.The issue is studied taking a case of the rapidly growing town,Barahathawa Municipality of Tarai Region of Sarlahi District.After the declaration of the municipality,several new roads have been opened and upgraded;and the municipality is well-connected to the national transportation network.After promulgated the Constitution of Nepal 2015 and functioning the elected local body,the municipality budget has been increased significantly as a result of increasing municipal investment in so­cio-economic and physical infrastructure development and environmental protection which has attracted people,goods,and services creating the zone of influence on the municipality.One of the changes found in the munici­pality is the increasing built-up area and expansion of urban growth through the decreasing agricultural land.Urban growth has been observed taking place around the Barahathawa Bazaar and main roadsides.The built-up area in Barahathawa municipality has remarkably increased by 183percent with the decrease of shrub and agricultural land within 10 years.Implica­tions of such spatial and temporal dynamics have been a core issue of urban planning in most of the newly declared municipalities in Nepal.

Urban Expansion in China Based on Remote Sensing Technology：A Review

Urban areas and its evolution are important anthropogenic indicators and human ecological footprints, and play decisive roles in environmental change analysis, global geo-conditional monitoring, and sustainable development. China has the highest rate of urban expansion and has emerged as an urban expansion hotspot worldwide. In this paper, the progress of studies on Chinese urban expansion based on remote sensing technology are summarized and analyzed from the aspects of urban area definition, remotely sensed imagery applied in urban expansion, monitoring methods of urban expansion, and urban expansion applications. Existing issues and future directions of Chinese urban expansion are discussed and proposed. Results indicate that: 1) The fusion of multi-source remotely sensed imagery is imperative to meet the needs of urban expansion with various monitoring terms and frequencies on different scales and dimensions. 2) To guarantee the classification accuracy and efficiency and describe urban expansion and its influences on local land use simultaneously, the combination of visual interpretation and automatic classification is the tendency of future monitoring methods of urban areas. 3) Urban expansion data have become the prerequisite for recognizing the urban development process, excavating its driving forces, simulating and predicting the future development directions, and also is conducive to revealing and explaining urban ecological and environmental issues. 4) In the past decades, Chinese scholars have promoted the application of remote sensing technology in the urban expansion field, with data construction, methods and models developing from the quotation stage to improvement and innovation stage; however, an independent and consistent urban expansion data on the national scale with long-term and high-frequency(such as annual monitoring) monitoring is still lacking.

Spatial and Temporal Dynamics of Surface Water in China from the 1980s to 2015 Based on Remote Sensing Monitoring

Climate change and human interference play significant roles on dynamic of water body abundance,and drive related hydrological,biochemical and social/economic processes.Documenting and monitoring surface water area with high resolution multi-temporal satellite imagery provide new perspective to evaluate the dynamics of surface water area,especially in continental and global scale.In this study,based on the Landsat images from 1980 s to 2015,we surveyed the spatial and temporal variation of surface water area,including rivers,lakes and reservoirs,in 10-yr temporal slice across China.Furthermore,the driving forces of the variation has been identified to reveal the interaction of water bodies and the changing environment.The results show that,the water surface area expanded over all three decades with strong spatial and temporal difference,despite the drier and warmer climate background;although lakes comprise the largest portion of the surface water area,the highest contributor of surface water expansion was new constructed reservoir located in the densely populated region;climatic parameters alteration,like precipitation and temperature,resulted in the water surface expansion in the northwestern basin by growing water input linked with rain and glacier melting;in the rest part of China,rise of water surface area was predominately attributed to human relocation of water resource,which yielded more new water storage area than the disappeared water body caused by less precipitation and stronger evapotranspiration.The conclusions highlight the integrative water resource management,especially in water conservation and restoration.

西安都市圈城市扩张时空演变及其影响因素研究

我国城市化快速发展的背景下,城市用地受到多种因素的影响,在时间和空间上都呈现出不同的演化特征。本文以西安都市圈为例,构建土地利用转移矩阵,对西安都市圈2000年、2010年和2020年的城市扩张进行研究,刻画西安都市圈城市扩张时序与空间的演变特征。在此基础上,采用地理探测器,对西安都市圈城市空间格局演化的影响因素进行分析。研究结果表明:(1)西安都市圈核心区城市建成区在30年间,一直处于加速拓展趋势,在2010年之后,拓展速度不断加快;而拓展强度却先降后升,1990—2000年期间,拓展强度超过100%,此时是加速拓展时期,由于城市建成区面积在前期已经达到较大基数,城市扩展速度在2000年之后逐渐回落,2010—2020年期间拓展强度缓慢提升。(2)西安都市圈核心区的空间扩展有明显的阶段性特征:跳跃扩展阶段(2001—2005年)、圈层填充阶段(2006—2010年)、全面拓展阶段(2011—2015年)、向西跨越阶段(2016—2020年)。(3)地理探测器单因子探测分析结果显示,地方财政一般预算收入与城乡居民收入差距指数对城乡工矿建设用地占比的交互解释度最大,为0.677;地方财政一般预算收入与其他因子的交互解释度最大,均大于0.45;农林牧渔业总产值次之,均大于0.35。城乡工矿建设用地占比主要受到地方财政一般预算收入、农林牧渔业总产值与其他因子共同推动。本文为研究西安都市圈城市空间格局的演变过程,揭示城市土地利用空间格局的影响机制提供理论依据。

淄博市2004—2024年建成区时空变化研究

监测城市建成区变化对于科学规划城市、提升居民生活质量至关重要。以山东省淄博市为例,利用2004年、2014年和2024年3个时间节点的Landsat影像数据,分析城市建成区变化的时空特征。通过对比5种ENVI影像分类方法,选择精度最高的支持向量机法提取建成区范围,利用GIS技术计算建成区的面积。结果表明:在过去二十年间淄博市建成区呈现扩张趋势,其重心整体向西偏北方向迁移,城市发展呈现外扩特征,但建成区边界呈现不规则性;建成区的扩张情况受自然环境、人口、经济、交通状况和政策导向等多种因素的影响。为促进淄博市城市可持续发展,建议未来城市规划应注重提升建成区的规整度和紧凑性,提高城市空间利用效率,加强对影响因素的综合管理。

基于NPP-VIIRS的合肥都市圈空间形态演变研究

合肥都市圈位于长三角,是长三角六大都市圈之一。合肥市作为长三角重要枢纽,社会经济发展迅速,但由于合肥都市圈除合肥市外各市区发展基础较弱,其发展不一,城市发展扩张水平不一,为探究合肥都市圈城市形态演变规律,揭示2012—2021年形态状况,利用NPP-VIIR夜光遥感数据提取2012、2014、2016、2018、2020和2021年度合肥都市圈数据,运用参考比较法提取合肥都市圈城市建成区,并计算扩张速度,扩张强度,扩张速率等相关建设数据,分析2012—2021年合肥都市圈城市扩张动态变化情况。结果表明:(1)提取建成区精度较高,可反映合肥都市圈城市建成区发展实际情况,城市扩张由高水平逐渐变为平缓扩张,都市圈重心逐步向合肥市辖区方向摆动。(2)研究时间内,合肥一直为都市圈首位度第一位城市,呈现倒V状。各市夜间灯光总强度和平均强度均表现为增强趋势。(3)捷夫指数表明,除个别城市外,城市群中其余城市发展较为充足,城市规模等级较为理想。(4)合肥成为稳定的热点区,有一定辐射带动能力,但总体辐射带动能力在整个都市圈内仍显不足。合肥市应充分发挥自身优势,统筹全域,助力都市圈发展。

南阳市建成区扩张的时空特征及影响因素分析

选取2000年、2010年Landat5和2020年Landsat8遥感影像,进行土地监督分类并计算建成区面积,对2000—2020年南阳市建成区扩张的时空特征进行探析。得到南阳市建成区扩张速度和扩展强度两个维度的时空特征,分析了影响南阳市建成区扩张时空特征的因素,包括政策因素、地形地势的影响、经济因素、交通等基础设施的建设等。

安溪县国土空间总体规划中心城区空间发展的研究

城市空间结构是城市历史发展的产物,有助于了解城市的特征和功能组织方式。为了探索山地型城市独特的空间发展模式,研究以泉州市安溪县为例,通过分析安溪县中心城区的空间要素和空间拓展动力机制,明确中心城区的空间拓展模式和发展策略,在国土空间规划体系的新要求下,为同类型市县中心城区的空间发展提供新的思路。

基于夜光遥感的合肥市建成区扩张研究

以我国经济快速发展新兴城市合肥市为例,基于夜间灯光数据,从城市化水平、扩张能力和时空转移特征3个方面分析合肥市2005—2020年间建成区的时空演变,并对影响因素进行探讨。结果表明,采用夜间灯光数据提取的合肥市建成区范围平均相对误差为2.41%,建成区总体呈现以南、北向为主导的环状扩展状态。复合灯光指数能有效表征合肥市建成区城市化发展水平,在此期间,城市化水平增幅超两倍。建成区重心经过“西南—东南—西南”的转移过程整体向南偏移,人口紧凑度呈现先内部聚集后外部扩散再重新聚集的“震荡”特征,总体趋于紧凑发展的态势。建成区时空演变主要受社会经济因素驱动影响,同时也受到交通与人口因素的正向驱动。

长沙市区建设用地扩张的时空特征

以不同时段的遥感影像资料为数据源，借助GIS技术对空间数据的统计及分析功能，提取出6个时期长沙市建成区变化的相关数据信息。在此基础上，利用扩张速度、扩张弹性、分维数、玫瑰图等方法分析长沙市区1986-2004年建设用地扩张的时空特征。结果表明，近20年来，长沙城市建设用地扩张了将近1倍，尤其是2002-2004年，建设用地扩张趋势最为明显。现阶段城市的扩张主要表现为低密度填充式的蔓延，城区扩张方向的主要方位是NW270°～295°和SE165°～180°。建设用地扩张的驱动因素除经济发展及人口增长因素之外，政策也是重要的影响因素，尤其是近年来政策因素的作用更为突出。未来长沙城市的空间发展将是多中心组团式的扩张，城市扩张方向日趋合理化。

开发区与我国城市空间结构演进及其动力机制

开发区是近 2 0年来我国经济发展的重要空间载体。经济活动在开发区的集聚 ,对所在地区的空间结构产生了深刻的影响。结合对开发区的实地调研 ,提出我国开发区与城市空间结构演进的基本类型可分为双核结构、连片带状结构、多极触角结构等。并指出开发区与城市空间结构的演进主要是由跨国公司主导的外部作用力。

北京山区建设用地扩展空间分异分析

根据目前描述建设用地扩展空间分异所用各种指数，结合山区扩展实际情况，提出了扩展程度指数的概念。并基于土地利用详查和变更数据，测算了1993～1996，1996～1999，1999-2002三个不同阶段山区建设用地的扩展变化率、扩展强度和扩展程度等指数，分析了北京山区不同类型建设用地的扩展特征及其空间差异。结果表明：20世纪90年代以来，北京山区的建设用地发生了剧烈变化，建设用地扩展程度逐年增强，郊区城市化正向远郊区扩散。山区尚处于城市化的初级阶段，建设用地扩展存在不规则性，区域差异明显。扩展变化率、扩展强度和扩展程度等指数的结合使用更全面准确地描述了山区建设用地扩展及其空间分异状况。

长株潭地区建设用地扩张遥感时空特征分析

利用遥感、GIS一体化技术,获取长沙、株洲、湘潭3市（长株潭地区）2000年、2005年和2010年3期陆地卫星图像,提取建设用地扩张及其空间分布信息。运用扩张速度指数和强度指数分别对2000—2010年间10 a变化以及2005年为界的前后两个5 a区域建设用地时序特征进行分析;利用优势度指数分析了区域建设用地扩张的空间趋向性。结果表明：长株潭地区建设用地在不同时期都处于增长的趋势,其中前5 a建设用地扩张速度和强度都要明显高于后5 a。2000—2010年间建设用地面积增加约3.94万hm2,前后2个时期的扩张面积分别占增加总量的57.30%和42.70%。对长株潭地区建设用地扩张进行时空特征分析,认为建设用地扩张引起区域内耕地和林地在数量和空间格局上的变化,城区周围9-12 km范围内耕地极易转入建设用地;2个时期河流附近耕地流入建设用地随距离变化而呈现不同特征;前5 a城区周围林地转入建设用地强度大,距离交通用地3 km附近的林地易转入建设用地。

长江三角洲地区城市空间扩展研究

城市化是建设用地扩展的主要驱动因素,分析建设用地时空演化格局已成为学者研究城市化过程的重要视角。采用空间自相关等方法,测度了1985年以来长江三角洲地区城市空间扩展的集聚特征并分析其演变过程;并结合格网建设用地密度频率的变化特点,将空间划分为不同的景观梯度地带,以此研究城市空间在不同地带中的扩展特点。研究结果表明,长三角城市空间扩展聚集程度先降后升,城市化区域融合趋势明显,并在城市空间扩展中表现出以上海、南京和苏州等为代表的3种模式,反应了长三角内部不同的经济发展特点。此外,在不同景观梯度下,长三角城市空间扩展表现出典型的阶段性特征。2000年以前在各个景观梯度下城市空间扩展差异较小,表现为较强的拓展性扩展;2000年以后,在城市核心区扩展强度加强,表现为填充式扩展加快。同时,城乡过渡区面积增加迅速,表明随着城市空间扩展的加速,长江三角洲地区城市土地不集约利用现象已较为突出。

长株潭城市群核心区城镇景观空间扩张过程定量分析

城镇扩张是城镇化过程最直接的表现,定量研究与揭示城镇空间扩张模式,对理解区域城镇化过程及城镇空间规划具有重要的意义。利用景观扩张指数定量研究了长株潭城市群核心区1993-2006年城镇景观空间演化过程,揭示其城镇景观空间扩张规律。结果表明:①研究时段内,城镇用地发展经过了凌乱分散的初级发展阶段后正趋向局部紧凑和区域布局合理;②1993-2006年间,长株潭城市群核心区城镇景观扩张主要是以边缘式增长为主,但是不同的时期,景观扩张表现出相异的空间扩张模式:1993-1996年间,景观扩张方式主要是以边缘式和飞地式为主,这一阶段长株潭城市群核心区处于快速城镇化过程的初级阶段;1996-1998年城镇化过程加快,这一阶段的城镇发展显得凌乱而分散,飞地式扩张明显;1998-2001年处于快速城镇化发展的扩散阶段,以边缘式扩张为主;2001-2006年间,处于快速城镇化的聚合阶段,城镇发展主要以边缘式和填充式为主;③长株潭城市群核心区在1993-2006年间,其平均斑块扩张指数和面积加权平均斑块扩张指数都呈上升趋势,表明城镇景观扩张更趋于紧凑。

大连居住空间的扩散及郊区化研究

文章通过对比1983,1993,2002年大连城市居住空间的分布,分析了城市居住空间扩散的演化;从定量和定性2个方面探讨了城市居住郊区化的基本特点和规律;揭示了大连居住郊区化对城市建设的效应及居住郊区化的动力机制。

北京市住宅区位空间特征研究

在实地调研基础上 ,就北京市近年来住宅区位空间的变化特征和发展趋势进行了分析。北京市住宅区位空间具有以下特征 :一是呈圈层式向外扩展 ;二是城北发展明显快于城南 ;三是基本形成五大住宅扇面 ;四是CBD、望京、亚运村和中关村成为京城居住最受关注的区位。从今后住宅空间的发展趋势来看 。