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Wetland and habitat dynamics in the evolving landscape of the Middle Yangtze River Basin

Journal of Geographical Sciences 2025年第1期35卷 88-111页

作者： YANG Peng SUN Kaiya ZHU Yanchao XIA Jun HUANG Heqing SONG Jingxia SHI Xiaorui LU Xixi Hubei Key Laboratory of Regional Ecology and Environmental Change School of Geography and Information Engineering China University of Geosciences department of geography National University of Singapore State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

Wetlands play a critical role in the global environment. The Middle Yangtze River Basin(MYRB), known for its abundant wetland resources, has experienced notable changes resulting from the complex interplay of environmental factors. Therefore, we investigated the spatiotemporal characteristics of wetland ecological quality in the MYRB from 2001 to *** the random forest(RF) regression algorithm and patch-generated land-use simulation(PLUS) model, we forecasted variations in wetland habitat quality and their determinants under the Shared Socioeconomic Pathway-Representative Concentration Pathway(SSPRCP) framework from 2035 to 2095. The main findings are as follows:(1) The RF algorithm was optimal for land-use and land-cover(LULC) classification in the MYRB from 2001 to 2020,when notable changes were observed in water bodies and buildings. However, the forested area exhibited an increase and decrease of 3.9% and 1.2% under the SSP1-2.6 and SSP5-8.5 scenarios, respectively, whereas farmland exhibited a diminishing trend.(2) Wetlands were primarily concentrated in the central and eastern MYRB, with counties in the southwest exhibiting superior ecological-environmental quality from 2001 to 2020. Notably,wetland coverage revealed significantly high level, significant changes, frequent but relatively minor changes under the SSP1-2.6, SSP2-4.5, and SSP 5-8.5 scenarios, respectively.(3)Regions with lower habitat quality were primarily concentrated in urbanized areas characterized by frequent human activities, indicating a clear degradation in habitat quality across different scenarios. In conclusion, we established a foundational framework for future investigations into the eco-hydrological processes and ecosystem quality of watersheds.

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Spatial analysis of public health facilities in Riyadh Governorate,Saudi Arabia:a gis-based study to assess geographic variations of service provision and accessibility

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Geo-Spatial Information Science 2016年第1期19卷 26-38页

作者： Shawky MANSOUR Faculty of Arts Department of Geography and GISAlexandria UniversityEl ShatbyAlexandriaEgypt

Much attention has been given to address public health policy in Saudi Arabia,particularly for the management,quality,and coverage ***,assessment of spatial patterns,distribution,and provision of public health services has been *** paper analyzes the availability and accessibility of public health facilities across Riyadh Governorate,Saudi Arabia at the subnational *** and attribute data of public health facilities potentially have been analyzed using gis to produce accurate measure of *** spatial pattern of service distribution was examined using average nearest *** from demand points(populations)to providers(facilities)were calculated for each district using near *** addition,the ratios of public health facility to population were calculated to identify underserved and overserved *** findings clearly indicate that the spatial pattern of the distribution of public health facilities was significantly clustered(p value<0.001)with Z-score of–*** districts within the central parts of the governorate were identified as having a higher density of facilities,while most of districts that are located in the marginal parts exhibit very low density of health ***,there was a considerable variation in the average distance from district centroids to health ***,less than half of the population(45.4%)living in 61 districts has access to public health facility within less than 1-km *** contrast,the greatest increase in distances was observed for 6%of population living in 38 *** that live in such districts need to travel long distances for public health *** output of this analysis can assist policy-makers and authorities of Riyadh Governorate in planning public health delivery.

关键词： gis public health facilities accessibility availability Riyadh Governorate

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Seismic vulnerability assessment of urban buildings using the rough set theory and weighted linear combination

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Journal of Mountain Science 2022年第3期19卷 849-861页

作者： Yasaman ASADI Najmeh NEYSANI SAMANY Majid KIAVARZ MOQADAM Ata ABDOLLAHI KAKROODI Meysam ARGANY department of Remote Sensing and gis Faculty of GeographyUniversity TehranTehran 33137-67464Iran

Seismic vulnerability assessment of urban buildings is among the most crucial procedures to post-disaster response and recovery of infrastructure *** present study proceeds to estimate the seismic vulnerability of urban buildings and proposes a new framework training on the two ***,a comprehensive interpretation of the effective parameters of this phenomenon including physical and human factors is ***,the Rough Set theory is used to reduce the integration uncertainties,as there are numerous quantitative and qualitative *** objectives were conducted on seven distinct earthquake scenarios with different intensities based on distance from the fault line and the *** proposed method was implemented by measuring seismic vulnerability for the seven specified seismic *** final results indicated that among the entire studied buildings,71.5%were highly vulnerable as concerning the highest earthquake scenario(intensity=7 MM and acceleration calculated based on the epicenter),while in the lowest earthquake scenario(intensity=5 MM),the percentage of vulnerable buildings decreased to approximately 57%.Also,the findings proved that the distance from the fault line rather than the earthquake center(epicenter)has a significant effect on the seismic vulnerability of urban *** model was evaluated by comparing the results with the weighted linear combination(WLC)*** accuracy of the proposed model was substantiated according to evaluation *** assessment based on the distance from the epicenter and its comparison with the distance from the fault shows significant reliable results.

关键词： Seismic vulnerability Urban buildings Rough set theory Earthquake scenarios WLC

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gis-based ordered weighted averaging and Dempster-Shafer methods for landslide susceptibility mapping in the Urmia Lake Basin, Iran

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International Journal of Digital Earth 2014年第8期7卷 688-708页

作者： Bakhtiar Feizizadeh Thomas Blaschke Hossein Nazmfar department of Physical geography Centre for Remote Sensing and GISUniversity of TabrizTabrizIran department of Geoinformatics(Z_gis) University of SalzburgSalzburgAustria department of geography and Urban Planning University of Mohaghegh ArdabiliArdabilIran

In this paper,gis-based ordered weighted averaging(OWA)is applied to landslide susceptibility mapping(LSM)for the Urmia Lake Basin in northwest *** landslide causal factors were used,whereby the respective parameters were extracted from an associated spatial *** factors were evaluated,and then the respective factor weight and class weight were assigned to each of the associated factors using analytic hierarchy process(AHP).A landslide suscept-ibility map was produced based on OWA multicriteria decision *** order to validate the result,the outcome of the OWA method was qualitatively evaluated based on an existing inventory of known ***,an uncertainty analysis was carried out using the Dempster-Shafer *** on the results,very strong support was determined for the high susceptibility category of the landslide susceptibility map,while strong support was received for the areas with moderate *** this paper,we discuss in which respect these results are useful for an improved understanding of the effectiveness of OWA in LSM,and how the landslide prediction map can be used for spatial planning tasks and for the mitigation of future hazards in the study area.

关键词： gis-multicriteria decision analysis OWA uncertainty analysis belief landslide susceptibility mapping Urmia Lake Basin

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Natural and human-induced decline and spatio-temporal differentiation of terrestrial water storage over the Lancang-Mekong River Basin

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Journal of Geographical Sciences 2025年第1期35卷 112-138页

作者： CHEN Junxu WANG Yuan ZHAO Zhifang FAN Yunjiang LUO Xiaochuan YI Lu FENG Siqi YANG Liang Emlyn Yunnan Key Laboratory of Soil Erosion Prevention and Green Development Yunnan University International Joint Research Center for Karstology Yunnan University School of Engineering Westlake University department of geography Ludwig Maximilian University of Munich (LMU)

Due to water conflicts and allocation in the Lancang-Mekong River Basin(LMRB), the spatio-temporal differentiation of total water resources and the natural-human influence need to be clarified. This work investigated LMRB's terrestrial water storage anomaly(TWSA) and its spatio-temporal dynamics during 2002–2020. Considering the effects of natural factors and human activities, the respective contributions of climate variability and human activities to terrestrial water storage change(TWSC) were separated. Results showed that:(1) LMRB's TWSA decreased by 0.3158 cm/a.(2) TWSA showed a gradual increase in distribution from southwest of MRB to middle LMRB and from northeast of LRB to middle LMRB. TWSA positively changed in Myanmar while slightly changed in Laos and China. It negatively changed in Vietnam, Thailand and Cambodia.(3) TWSA components decreased in a descending order of soil moisture, groundwater and precipitation.(4) Natural factors had a substantial and spatial differentiated influence on TWSA over the LMRB.(5) Climate variability contributed 79% of TWSC in the LMRB while human activities contributed 21% with an increasing impact after 2008. The TWSC of upstream basin countries was found to be controlled by climate variability while Vietnam and Cambodia's TWSC has been controlled by human activities since 2012.

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Seismic vulnerability assessment of urban buildings and traffic networks using fuzzy ordered weighted average

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Journal of Mountain Science 2019年第3期16卷 677-688页

作者： Yasaman ASADI Najmeh Neysani SAMANY Keyvan EZIMAND department of Remote Sensing and gis Faculty of GeographyUniversity of Tehran Remote Sensing and gis Center Faculty of Earth ScienceUniversity of Shahid Beheshti

Urban buildings and urban traffic network are considered as the vital arteries of cities which have particular effects especially after the crisis in the search and rescue operations. The aim of this study is to determine the vulnerability of urban areas especially, buildings and traffic networks using multicriteria geographic information systems and decisionmaking methods. As there are many effective criteria on the seismic vulnerability that they have uncertain and vague properties, the method of this paper is applying fuzzy ordered weighted average(OWA) to model the seismic vulnerability of urban buildings and traffic networks in the most optimistic and pessimistic states. The study area is district 6 of Tehran that is affected by the four major faults, and thus will be threatened by the earthquakes. The achieved results illustrated the vulnerability with different degrees of risk levels including very high, high, medium, low and very low. The results show that in the most optimistic case 14% and in the pessimistic case 1% of buildings tolerate in very low vulnerability. The vulnerability of urban street network also indicates that in the optimistic case 12% and in the pessimistic case at most 9% of the area are in appropriate condition and the North and NorthEast of the study area are more vulnerable than South of it.

关键词： Earthquake Vulnerability Assessment Urban buildings Traffic network Multi-Criteria Decision Analysis(MCDA) Fuzzy-OWA

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Scale effect of Planck's law over nonisothermal blackbody surface

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Science China(Technological Sciences) 1999年第6期42卷 652-656页

作者：李小文王锦地 A. H. Strahler Research Center for Remote Sensing and gis Beijing Normal University department of geography and Center for Remote Sensing

Many physical laws, principles, models, measurement methods, etc., are applicable only to either a point on surface or a homogeneous surface. However, remote sensing deals with pixels which may range from meters to kilometers. Therefore scale effects of these laws and measurements are inevitable problems which must be faced. As an example, the spatial scale effect of Planck Law over nonisothermal blackbody surface is considered.

关键词： scale effect Planck’s law reciprocity.

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An IconMap-based exploratory analytical approach for multivariate geospatial data

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Science China(Information Sciences) 2013年第1期56卷 198-207页

作者： ZHANG XianFeng LIAO ChunHua LIU Yu LI Jonathan Institute of Remote Sensing and gis Peking University department of geography and Environmental Management University of Waterloo

This paper discusses an iconmap-based visualization technique that enables multiple geospatial variables to be illustrated in a single gis raster *** is achieved by extending the conventional pixelbased data structure to an iconic *** this way,spatial patterns generated by the interaction of geographic variables can be disclosed,and geospatial information mining can be readily *** a case study,a visual analysis of soil organic matter and soil nutrients for Shuangliu County in the city of Chengdu,China,was undertaken using the prototype IconMapper software,developed by the *** results show that the static IconMap can accurately exhibit trends in the distribution of organic matter and nutrients in *** dynamic iconmap can both reflect interaction patterns between organic matter and the nutrient variables,and display soil fertility levels in a comprehensive ***,the iconmap-based visualization approach is shown to be a non-fused,exploratory analytical approach for multivariate data analysis and as a result is a valuable method for visually analyzing soil fertility conditions.

关键词： iconmap soil fertility visualization icon blocks multivariate geospatial data

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Matching authority and VGI road networks using an extended node-based matching algorithm

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Geo-Spatial Information Science 2015年第2期18卷 65-80页

作者： Ehsan ABDOLMAJIDI Ali MANSOURIAN Julian WILL Lars HARRIE gis Center Department of Physical Geography and Ecosystem ScienceLund UniversitySölvegatan 1222362 LundSweden

The amount of volunteered geographic information(VGI)has increased over the past decade,and several studies have been conducted to evaluate the quality of VGI *** this study,we evaluate the completeness of the road network in the VGI data set OpenStreetMap(OSM).The evaluation is based on an accurate and efficient network-matching *** study begins with a comparison of the two main strategies for network matching:segment-based and nodebased *** comparison shows that the result quality is comparable for the two strategies,but the node-based result is considerably more computationally ***,we improve the accuracy of node-based algorithm by handling topological relationships and detecting patterns of complicated network ***,we conduct a case study on the extended node-based algorithm in which we match OSM to the Swedish National Road Database(NVDB)in Scania,*** case study reveals that OSM has a completeness of 87%in the urban areas and 69%in the rural areas of *** accuracy of the matching process is approximately 95%.The conclusion is that the extended node-based algorithm is sufficiently accurate and efficient for conducting surveys of the quality of OSM and other VGI road data sets in large geographic regions.

关键词： geographic data volunteered geographic information(VGI) OpenStreetMap(OSM) node-based matching segment-based matching pattern detection Swedish National Road Database(NVDB)

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Monitoring the source of trans-national dust storms in north east Asia

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International Journal of Digital Earth 2008年第1期1卷 119-129,I0008页

作者： R.Tsolmon L.Ochirkhuyag T.Sternberg NUM-ITC-UNESCO Remote Sensing/gis laboratory National University of Mongolia department of geography Oxford University

The vast expanse of the Gobi desert across the Mongolian plateau experiences frequent dust *** this isolated region remote sensing techniques can provide an effective measurement of dust *** temperature channels 4,5 of AVHRR/NOAA satellite data,emissive bands of MODIS/TERRA satellite data and meteorological station measurement data were used and tested for dust and sandstorm mapping in the desert area of Mongolia and northern *** differences between thermal bands in combination with geographic information system(gis)layers were used for mapping in this *** results show that dust and sand storm maps can be achieved from emissive bands for monitoring of dust and *** active dust storm sources can occur in truly remote areas where there is little or no human activity,although many sources are associated with areas where human impacts are well ***,on a regional scale dust mobilisation appears to be dominated by natural sources.

关键词： dust and sand storm AVI MODIS/TERRA AVHRR/NOAA

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