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3rd International Conference on Geology, Mapping and remote sensing, ICGMRS 2022

作者： Qian, Lisha Chen, Shuisen Jiang, Hao Dai, Xuemei Jia, Kai Guangzhou Institute of Geography Guangdong Academy of Sciences Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and Application Res. Center of Guangdong Province for Engineering Technology Application of Remote Sensing Big Data Guangzhou China Shaoguan ShenBay Low Carbon Digital Technology Co. Ltd. Guangdong Shaoguan China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China University of Chinese Academy of Sciences Beijing China

ISBN: (数字)9781665485951

ISBN: (纸本)9781665485951

With a foreseen increase in the number of agrometeorological disasters due to climate change, especially in the field of crop lodging. This paper presented an innovative monitoring technique to explore the application potential of muti-source remote sensing data. Based on the sugarcane planting area extracted from sentinel-1 time-series data and combination of Landsat-8 and sentinel-2 MSI images before and after Super Typhoon Hato, a vegetation index distance leveling method was come out and then was applied to assess the sugarcane lodging in Dagang Town, Nansha District, Guangzhou City. The region was caused by strong wind and rainstorm on August 23, 2017. The validation results showed that the multi-temporal Sentinel-1 image data can effectively extract the sugarcane planted area before and after lodging with an accuracy of 87.83%. Compared with other vegetation indices (RVI/LSWI/NBR/EVI/DVI), NDVI was the most sensitive in response to sugarcane lodging. The validation accuracy of extracting farmland damage extent reached 71.64%, among them, the affected area of sugarcane reached 711.33 ha. The study further illustrates the capability of the image vegetation index difference method on monitoring of sugarcane lodging degree at the reginal scale. © 2022 IEEE.

关键词： remote sensing

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Study of the river-lake assessment system based on GIS in Pearl River basin

Study of the river-lake assessment system based on GIS in Pe...

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International Conference on Geoinformatics

作者： Kaiwen Zhong Kekui Ding Caige Sun Xulong Liu Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of Geography Guangzhou China Key Lab of Guangdong for Utilization of Remote Sensing and Geographical information System Guangzhou Institute of Geogranhy Guangzhou China

ISBN: (纸本)9781467376648

According to the actual situation of Pearl River basin and the existing evaluation index systems of river-lake health, a new evaluation index system of river-lake health in Pearl River basin was built. The river-lake health assessment system was built using ArcGIS as a development platform. The data was obtained based on remote sensing and GIS. The rapidness and visualization of river-lake health assessment were realized by this system, which could support the protection services in Pearl River basin.

关键词： Indexes Rivers Lakes Hydrology Monitoring Biological system modeling Analytical models

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Analysis of Landscape Pattern Spatial Scale in Middle and Upper Reaches of Meijiang River Basin 7th

Analysis of Landscape Pattern Spatial Scale in Middle and Up...

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7th International Conference on Geoinformatics in Sustainable Ecosystem and Society, GSES 2019, and 1st International Conference on Geospatial Artificial Intelligence for Urban Computing, GeoAI 2019

作者： Chen, Yuchan Zhang, Zhengdong Yang, Chuanxun Yang, Yang Zhang, Chen Han, Liusheng Yang, Ji Han, Xiangyu Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of Geography Guangzhou510070 China School of Geography South China Normal University Guangzhou510631 China Guangzhou511458 China University of Chinese Academy of Sciences Beijing100049 China State Grid Chengdu Electric Supply Company Chengdu610000 China

ISBN: (纸本)9789811561054

The scale research of landscape pattern is an important basis for the study of spatiotemporal evolution of landscape pattern and the scientific and reasonable allocation of landscape pattern. This paper takes the middle and upper reaches of Meijiang river as the research area. Combined with spatial grain size analysis and extent size analysis, the spatial scale effect was studied to select the optimal research scale in this research area. The results show that most of the appropriate grain size of landscape pattern indexes are in range of 90–150 m, and the optimal grain size scale is 150 m in Middle and Upper Reaches of Meijiang River Basin. At the grain size scale of 150 m, the spatial self-correlation of landscape pattern index over 50% is the highest at the extent size of 300 m, and the optimal extent size scale is 300 m in this basin. This paper determines the optimal scale of landscape pattern in the middle and upper reaches of Meijiang river basin, which is of great significance to the ecological balance and sustainable development of the basin. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Rivers

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A case study of regional ecological risk assessment based on landscape structure 5th

A case study of regional ecological risk assessment based on...

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5th International Conference on Risk Analysis and Crisis Response, RACR 2015

作者： Liu, Xulong Dong, Jiahua Zhong, Kaiwen Zhang, Junxiang Guangzhou Institute of Geography Key Laboratory of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangzhou China School of Geography and Planning Sun Yat-sen University Guangzhou China South China Institute of Environmental Sciences MEP Guangzhou China Guangzhou Institute of Geography Guangzhou China School of Tourism Huangshan University Huangshan China

ISBN: (纸本)9781138027459

Using the remote sensing images in 2000, 2006 and 2010, this paper extracted the information of landscape structure of Nansha district in Guangzhou city. The ecological risk index was built based on landscape index, and the ecological risk and dynamic variation were qualitatively assessed the process of rapid urbanization of study area. The results indicated that the landscape structure of the study area changed greatly from 2000 to 2010, especially, during 2000 to 2006, the built-land was expanded rapidly and the farmland was reduced significantly. The indexes of separation and fragmentation of landscape were increased. During 2006 to 2010, the rate of change becomes slower relatively. The regional ecological risk was increased in 2000–2010. The ecological risk level is lowest in 2000, and there is a significant increase in 2006. The ecological risk in 2006 and 2010 was equal nearly. We found that the water bodies and the farmland made great contributions to regional ecological risk. The sharp reduction of farmland is the main factor affecting the regional ecological risk. The results can provide a scientific basis for land use and ecological planning. © 2015 Taylor & Francis Group, London.

关键词： Land use

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Influencing Factors of Housing Sales Vacancy in the Guangzhou Metropolitan Area,China

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Journal of Architectural Research and Development 2021年第6期5卷 49-54页

作者： Xiaoli Yue Yang Wang Hong’ou Zhang Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou 510070Guangdong ProvinceChina School of Architecture and Urban Planning Guangdong University of TechnologyGuangzhou 510090Guangdong ProvinceChina Faculty of Geography Yunnan Normal UniversityKunming 650500Yunnan ProvinceChina

In this paper,nine indicators selected from three perspectives(convenience,environmental and location characteristics)and three regression models(OLS,SLM and SEM)are used to explore the influencing factors of housing sales vacancy in the Guangzhou Metropolitan Area,*** results show that subway accessibility,peripheral aversion municipal facilities and distance from the CBD(Central Business District)are consistent with theoretical *** accessibility is negatively correlated with the housing sales vacancy rates,while peripheral aversion municipal facilities and distance from the CBD are positively correlated with housing vacancy rates.

关键词： Housing vacancy Regression models Sales vacancy Influencing factors Guangzhou Metropolitan Area

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A total suspended sediment retrieval model for multiple estuaries and coasts by Landsat imageries 4

A total suspended sediment retrieval model for multiple estu...

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4th International Workshop on Earth Observation and remote sensing Applications, EORSA 2016

作者： Chongyang, Wang Dan, Li Danni, Wang Chen, Shuisen Wei, Liu Guangdong Open Laboratory of Geospatial Information Technology and Application Guangdong Key Lab. of Remote Sensing and Geographical Information System Technology Application Guangzhou Institute of Geography Chinese Academy of Sciences University of Chinese Academy of Sciences Guangzhou Beijing510070/5lO640 China Department of Resources and the Urban Planning Xin Hua College of Sun Yat-Sen University Guangzhou510520 China

ISBN: (纸本)9781509014798

Based on 119 in-situ data from five estuaries and coasts of South China including Xunwen coast, estuary of Moyangjiang River, estuary and coast of Pearl River, estuary of Hanjiang River and estuary of Yangtze River, this paper aims to develop and establish a TSS retrieval model that applicable in different field conditions. After recalibrating and validating the form with the highest correlation coefficient between reflectance and TSS concentration and other TSS retrieval models that have been successful applied in many places, we found that the quadratic model of the ratio of logarithmic transformation of red band and near infrared band and logarithmic transformation of TSS concentration (QRLTSS) shows the highest performance. QRLTSS model based on Landsat OLI, ETM+ and TM can explained about 71% of the TSS concentration variation (4.3∼577.2 mg/L) in the five regions and has a high and acceptable validation accuracy with root mean square error (RMSE) of 21.5-25mg/L and mean relative error (MRE) of 27.2-32.2%. We concluded that QRLTSS model can be used to quantify the TSS concentration of multiple estuaries and coasts of south China which would be helpful to understand the temporal and spatial variation of TSS in a large region. QRLTSS model should be applied to Landsat imagery for further validation in the future. The approach proposed in the paper also could promote the research work of establishing regional and uniform TSS retrieval model forward. © 2016 IEEE.

关键词： Estuaries

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HJ satellite based mapping technologies of land use products for emergency response of agricultural disasters 23

HJ satellite based mapping technologies of land use products...

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23rd International Conference on Geoinformatics, Geoinformatics 2015

作者： Wang, Chongyang Li, Dan Zhou, Xia Huang, Siyu Liu, Wei Weiqi, Chen Shuisen, Chen Guangdong Open Laboratory of Geospatial Information Technology and Application Guangdong Key Lab. of Remote Sensing and Geographical Information System Technology Application Guangzhou Institute of Geography Guangzhou510070 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China University of Chinese Academy of Sciences Beijing100049 China Department of Geography and Anthropology Louisiana State University Baton RougeLA70803 United States

ISBN: (纸本)9781467376631

Accurate and reliable information on land use is a basis of agricultural disaster warning and emergency action. The natural disasters typhoon, cold disaster, drought, and so on, have great influences on agricultural production in guangdong Province, China. Through literature analysis at home and abroad, it was pointed out that Chinese HJ satellites have become important sources of remote sensing images due to short imaging period and broad coverage (about 2 days and 700km). It also advances the free sharing of OLI data on the new generation of remote sensor of Landsat. Considering the severe orbit deviation and frequent phenology changes of agricultural land use, this paper described and laid emphasis on the necessity and perspective of developing multi-scale (1:500,000, 120,000, 150,000) agricultural land use products of Provincial-City-County within guangdong through the usage of relatively fixed ground control point database and spectral library based advanced hierarchical classification technologies supported by HJ satellite data. Such a tendency of quick disaster emergency response for land use dynamic implies a technological focus on the usage of above-mentioned advanced HJ satellite technologies. Based on Landsat images, we also built the 11 united ground control points (40 points at most for whole guangdong Province) and standardized the technology system of land use remote sensing mapping with the combination of spectral library-based hierarchy classification technology. Selected key technologies for enhancing land use production mapping efficiency and accuracy that involve Landsat OLI and HJ satellites are presented and discussed. The HJ satellite is an effective information source for land use dynamic mapping under emergency action such as disaster damage evaluation, which can provide a short imaging period with wide spatial coverage and enhance the ability of land use data acquirement from one to three or four times or so in one year. The building of rel

关键词： Agriculture

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Spatial Pattern of Housing Sales Vacancy in Guangzhou’s Urban District, China

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Journal of World Architecture 2021年第6期5卷 47-51页

作者： Xiaoli Yue Yang Wang Yabo Zhao Hong’ou Zhang Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou 510070Guangdong ProvinceChina School of Architecture and Urban Planning Guangdong University of TechnologyGuangzhou 510090Guangdong ProvinceChina Faculty of Geography Yunnan Normal UniversityKunming 650500Yunnan ProvinceChina

Housing vacancy can reflect the destocking degree of the real estate *** on the data of 57 opened residential quarters(46,622 units)from 2015 to 2018,this paper constructs a calculation formula of the sales vacancy rate and then analyzes the spatial pattern in Guangzhou’s urban *** results show that there is obvious differentiation in the spatial pattern of housing sales vacancy in Guangzhou’s urban district,showing a higher spatial pattern in the old area and urban district and a lower spatial pattern in the core *** with high vacancy rates are mainly located in the east of the old area,the south and east of the urban district and near Baiyun Mountain in the north.

关键词： Housing vacancy Sales vacancy Guangzhou’s urban district Spatial pattern

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Leguminous green mulching alters the microbial community structure and increases microbial diversity by improving nitrogen availability in subtropical orchard systems in China

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Science of the Total Environment 2024年 955卷 176891页

作者： Wang, Na Li, Le Gou, Mengmeng Hu, Jianwen Chen, Huiling Xiao, Wenfa Liu, Changfu Key Lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of Geography Guangdong Academy of Sciences Guangzhou510070 China Ecology and Nature Conservation Institute Chinese Academy of Forestry Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Beijing100091 China Research Institute of Tropical Forestry Chinese Academy of Forestry Guangzhou510000 China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry University Nanjing210037 China

Microorganisms, the major decomposers of plant residues, are crucial for soil nutrient cycling. Living grass mulching effectively alters microbial community structure and promotes nutrient cycling. However, its consistency with mulching ages and growth periods remains unclear. Therefore, this study aims to clarify the dynamic characteristics of microbial communities and enzyme activities across different mulching ages. In this study, high-throughput sequencing technology was used to investigate bacterial and fungal community evolution in three mulching treatments with Vicia villosa for 8 years (VV_8), 4 years (VV_4), and clean tillage in a citrus orchard. This study covered three growth periods (citrus–grass: spring sprouting to budding period [SSBP], fruit swelling to withering period [FSWP], and fruit maturity to seeding period [FMSP]). The results showed that VV_4 and VV_8 treatments increased bacterial and fungal alpha diversity as well as the activities of nitrogen (N), carbon (C), and phosphorus cycling enzymes. C-cycling enzyme activity was the primary key factor driving changes in microbial diversity across growth periods. Under leguminous green mulching, bacteria alpha diversity increased the most during FSWP, while fungi increased the most during FMSP. Additionally, the relative abundance of Ascomycota and Basidiomycota significantly increased during the FSWP and FMSP, reaching 63.65–73.80 % and 79.73–84.51 %, respectively. With increasing mulching ages, the structural stability and synergistic effects of microorganisms were correspondingly enhanced. Furthermore, available nutrients determined microbial community evolution, with N availability being a key factor influencing microbial diversity, especially fungal diversity. In conclusion, as mulching ages increase, improved nutrient availability gradually enhances microbial diversity, synergistic interactions, and nutrient cycling functions, with copiotrophic taxa occupying a key position in the microbial n

关键词： Citrus orchard Growth period Microbial community Mulching age Nutrient cycling

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Effect of Water Application Methods on Salinity Leaching Efficiency in Different Textured Soils Based on laboratory Measurements and Model Simulations

SSRN

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SSRN 2022年

作者： Yang, Ting Cherchian, Setrag Liu, Xinmin Shahrokhnia, Hossein Mo, Minghao Šimůnek, Jirka Wu, Laosheng Key lab of Guangdong for Utilization of Remote Sensing and Geographical Information System Guangzhou Institute of Geography Guangdong Academy of Sciences Guangzhou510070 China Department of Environmental Sciences University of California RiversideCA92512 United States Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process College of Resources and Environment Southwest University Chongqing China Jiangxi Academy of Water Science and Engineering Nanchang330029 China

Irrigated agriculture has been in a quandary of sustaining its productivity for centuries while attempting to cope with soil and water salinity issues that continue to devastate crop production. Several of the research gaps associated with current irrigation methods include how to assess leaching requirement and efficiency for different soils, crops, and irrigation regimes. The objective of this study was to test irrigation water application methods on salinity leaching efficiency by laboratory column experiments and computer model simulations. Three water application methods, continuous ponding (CP), intermittent ponding (IP), and unsaturated application (UA), were imposed on the packed columns to evaluate salinity leaching efficiency. The HYDRUS-1D model was employed to inversely estimate hydraulic and solute transport parameters from the column experimental data, while the HYDRUS-2D model was used to simulate water and salinity transport under field irrigation regimes (every 7, 5, and 3 days). Among the different textured soils, water application methods have greater impact on leaching efficiency in coarse soils than that in finer soils. The quality of soil in terms of water transmission (measured by S) changes with different water application methods. Continuous ponding is the best choice for coarse soils to maintain soil quality at very good level. For finer soils, intermittent ponding and unsaturated application are better water application methods, and unsaturated application was the best for the loamy soil. When the irrigation scheme changed from flexible irrigation frequency to fixed frequency (every 7, 5, and 3 days), salinity around the root zone under flexible frequency irrigation is lower than that under fixed frequency irrigation (every 7, 5 or 3 days). For fixed frequency irrigation, more frequent application of smaller quantity of water is preferable to the application of large quantity at extended intervals in the loamy soil at almond orchard. The w

关键词： Efficiency

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