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A DEM fusion method for ascending and descending orbit StereoSAR DEMs in complicated mountain areas considering SAR echo intensity

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Journal of mountain Science 2021年第1期18卷 101-110页

作者： CAI Guo-lin SHEN Dong ZHANG Ao-li YU Hai-hua ZHANG Xuan-yu Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 610000China Kunming Engineering Corporation Limited Power ChinaKunming 650000China

To extract the high-quality DEM in complicated mountain areas,a DEM fusion method for ascending and descending orbit StereoSAR DEMs considering Synthetic Aperture Radar(SAR)echo intensity is *** the analysis for the influence of terrain features and SAR side-looking imaging characteristics on radar echo intensity and DEM accuracy,four Terras AR-X images with the stripmap mode and the 3 m spatial resolution covering a certain area of Maoxian County,Sichuan Province,China,was selected as the experimental *** technology was used to extract the ascending orbit StereoSAR DEM and the descending orbit StereoSAR DEM,respectively,and the corresponding radar echo intensity map was ***,while comparing the radar echo intensity corresponding to the same point position,DEM fusion was carried out,and the accuracy of DEM before and after the fusion was analyzed with the ground points measured by GNSS-RTK as reference ***,a high-quality DEM with a 3 m spatial resolution in the experimental area was *** DEM accuracy was improved on all slopes,and the mean absolute deviation(MAD)improved to 4.798 m,the standard deviation(SD)improved to 6.087 m and the LE90 improved to 40.48 *** experimental results indicate that the fusion method of highresolution ascending and descending orbit StereoSAR DEMs considering SAR echo intensity can effectively extract DEM with high accuracy and reliability,which can provide technical support for obtaining highquality terrain information in similar areas.

关键词： mountain areas StereoSAR Ascending orbits Descending orbits DEM fusion SAR echo intensity

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Topographic Correction-Based Retrieval of Leaf Area Index in mountain areas

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Journal of mountain Science 2012年第2期9卷 166-174页

作者： CHEN Wei CAO Chunxiang Institute of Remote Sensing Applications Chinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China

Leaf Area Index(LAI)is a key parameter in vegetation analysis and management,especially for mountain *** accurate retrieval of LAI based on remote sensing data is very *** a study at the Dayekou forest center in Heihe watershed of Gansu Province,we determined the LAI based on topographic corrections of a *** large variation in the mountain terrain required preprocessing of the SPOT-5 image,except when orthorectification, radiation calibration and atmospheric correction were *** required acquisition of surface reflectance and several vegetation indexes and linkage to field measured LAI *** regression models were used to link LAI and vegetation *** quadratic polynomial model between LAI and SAVI (L=0.35)was determined as the optimal model considering the R and R2 value.A second group of LAI data were reserved to validate the retrieval *** model was applied to create a distribution map of LAI in the *** with an uncorrected SPOT-5 image showed that topographic correction is necessary for determination of LAI in mountain areas.

关键词： SPOT-5 image Vegetation Index Leaf Area Index Topographic correction mountain areas

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Spatial pattern recognition for near-surface high temperature increases in mountain areas using MODIS and SRTM DEM

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Journal of mountain Science 2024年第6期21卷 2025-2042页

作者： WANG Yanxia YANG Lisha HUANG Xiaoyuan ZHOU Ruliang School of Soil and Water Conservation Southwest Forestry UniversityKunming 650224China School of Economics and Management Southwest Forestry UniversityKunming 650224China

Abrupt near-surface temperature changes in mountainous areas are a special component of the mountain climate *** and accurate measurements of the locations,intensity,and width of the near-surface changes are necessary but highly difficult due to the complicated environmental conditions and instrumental *** paper develops a spatial pattern recognition method to measure the near-surface high temperature increase(NSHTI),one of the lesser-attended ***,raster window measurement was proposed to calculate the temperature lapse rate using MODIS land surface temperature and SRTM DEM *** fully considers the terrain heights of two neighboring cells on opposite or adjacent slopes with a moving window of 3×3 cell ***,a threshold selection was performed to identify the NSHTI cells using a threshold of-0.65℃/100 ***,the NSHTI strips were parameterized through raster vectorization and spatial *** Yunnan,a mountainous province in southwestern China,as the study area,the results indicate that the NSHTI cells concentrate in a strip-like pattern along the mountains and valleys,and the strips are almost parallel to the altitude contours with a slight northward ***,they are located mostly at a 3/5 height of high mountains or within 400 m from the valley floors,where the controlling topographic index is the altitude of the terrain trend surface but not the absolute elevation and the topographic uplift height and cutting ***,the NSHTI intensity varies with the geographic locations and the proportions increase with an exponential trend,and the horizontal width has a mean of about 1000 m and a maximum of over 5000 *** result demonstrates that the proposed method can effectively recognize NSHTI boundaries over mountains,providing support for the modeling of weather and climate systems and the development of mountain resources.

关键词： High temperature increase mountain areas MODIS Spatial pattern recognition Raster window measurement Threshold selection

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Income Inequality in mountain areas: The Case of Agroforestry Farming Systems in Uluguru mountains, Tanzania

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Open Journal of Forestry 2021年第3期11卷 254-291页

作者： Reuben M. J. Kadigi Department of Food and Resource Economics School of Agricultural Economics and Business Studies Sokoine University of Agriculture CHUO KIKUU Morogoro Tanzania

Land degradation due to use of unsustainable agricultural practices has affected many communities in rural mountain areas rendering them to be more vulnerable to income poverty and inequality. In this case, agroforestry systems promise to offer great solutions as they can be developed in unfavourable conditions where other production systems would either rapidly degrade the land or otherwise would not be possible. However, little is known whether agroforestry can address issues of income inequality in mountain areas. Hence, we conducted a study to investigate the nature and determinants of income inequality in Uluguru mountains, Tanzania. Specifically, we used the cross-sectional research design and we calculated the income percentile shares, Gini coefficients and the coefficient of variation (CV), to pinpoint the nature of income inequality in the study area. The determinants of income inequality were analysed using the step by step multiple linear model. The results of analysis suggested prevalence of income inequality. Crop production was the main source of income in the agroforestry systems of the study area. Earnings from crops and timber were decreasing income-inequality amongst smallholder farmers. Our disaggregated analysis showed that off-farm income was also decreasing income-inequality for farmers with farmlands located close to homestead, for female-headed households, for farmers who did not access extension services, and those who were members of community-based financial institutions. Estimated incomes increased with household assets, size of farmland, and age of household head. However, the same decreased with household size. We found gender

关键词： Uluguru mountains mountain areas Income Inequality Income Percentile Shares Coefficient of Variation Step by Step Multiple Linear Regression

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Climate Change and Tourism Development in mountain areas of China

Climate Change and Tourism Development in Mountain Areas of ...

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The 3rd International Conference on Environmental Technology and Knowledge Transfer

作者： BAO Wen ZHANG Heng (Business School Chengdu University of Information Technology Chengdu 610103 China)

The purpose of the paper was to integrate the relationship of dynamics between climate change impacts and tourism industry adaptation in mountain areas of China,and understand ecological vulnerability of tourism area and explore ways to enhance mountain people’s adaptive capacities for tourism *** its rich tourism resources,the mountain areas of China are promising and potential regions to develop tourism ***,climate change is affecting the species of plants and animal *** unsustainable tourism development styles are also *** study suggested it is imperative that possible solutions and approaches to focus on the tourism implications of climate change in mountain areas of China on the base of government support in the long term.

关键词： climate change China tourism development mountain areas

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希望在山区

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生态学杂志 1989年第1期 27-30+35页

作者：石山中国科学院农业现代化研究委员会

人们都在思考、议论、探讨我国农业面临的严峻形势和出路问题。人口在继续增长,耕地在继续减少,而耕地的后备资源又非常有限;水资源不足,发展水田和水浇地受到很大限制。城市闹水荒,又将进一步影响农业用水,这已是世界上最为突出的问题... 详细信息

人们都在思考、议论、探讨我国农业面临的严峻形势和出路问题。人口在继续增长,耕地在继续减少,而耕地的后备资源又非常有限;水资源不足,发展水田和水浇地受到很大限制。城市闹水荒,又将进一步影响农业用水,这已是世界上最为突出的问题。仅靠耕地来解决人民生活和经济建设需要是困难的,使八亿农民富裕起来,难度就更大,这是勿庸置疑的。十三大政治报告指出,我国农村还处在开发时期,许多资源还没有合理利用,潜力很大,农林牧副渔各业和乡镇企业的发展前景都是十分广阔的。但如何开发,又如何利用很大的潜力来解决严峻的农业形势,对这些问题应认真作具体分析和探讨。

关键词： mountain areas agriculture.

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Length of stay in urban areas of circular migrants from the mountainous areas in China

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Journal of mountain Science 2016年第5期13卷 947-956页

作者： TAN Ming-hong LI Xiu-bin YAN Jian-zhong XIN Liang-jie SUN Lai-xiang Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China College of Resources and Environment Southwest UniversityChongqing 400715China Department of Geographical Sciences University of MarylandCollege ParkMD 20742USA

Currently, there is limited literature dealing with the length of stay of circular migrants in urban areas （LSCMU）, although many studies have discussed the phenomenon of migration and the determinants of migration. This study attempts to fill that gap using survey data from the mountainous areas of Chongqing, Southwest China. From a comparative perspective, this study divided workers into two groups （a young group aged between 16 and 35 years and an old group aged between 36 and 65 years）. The average LSCMU values for the young and old groups were 225 days and ~74 days, respectively. Two multi-regression models were used to estimate the determinants of LSCMU in the two groups. The results showed that LSCMU was closely related to individual factors in both groups, including gender, age and job training. Family and community factors, including household size, arable land per capita and the distance from market, had much weaker effects on the dependent variable, especially in the older group. It was noticeable that job training had significant positive effects on LSCMU in both groups; these findings have special implications for the urbanization process in China.

关键词： Circular migrants Urban mountain areas China

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Medical transportation and the contribution of air medical evacuation in isolated mountainous areas of Greece-Case study,Municipality of Agrafa

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Journal of mountain Science 2022年第11期19卷 3178-3191页

作者： Ioanna KARANI Anastasios BALASKAS Dimitris KALIAMPAKOS School of Rural Surveying and Geoinformatics EngineeringNational Technical University of AthensAthens 15780Greece School of Mining and Metallurgical Engineering National Technical University of AthensAthens 15780Greece Metsovion Interdisciplinary Research Center National Technical University of AthensAthens 15780Greece

In every emergency medical situation,access to emergency medical services is an inalienable right of any *** average acceptable time to provide first aid assistance is 60 *** this paper,the possibility of using helicopters for air travel in mountainous areas was examined for the first time for all of Greece and especially for a mountainous and isolated area such as the Municipality of ***,the time distance-virtual distance,from the hospitals was calculated at the national level of Greece,with an acceptable first contact time of 60 minutes(golden hour),i.e.,less than two hours from the nearest hospital to the incident and back to the hospital and the relevant conclusions are ***,the case study of Municipality of Agrafa,one of the most mountainous areas in Greece,was *** time distance of the settlements from the nearest primary health point,namely the Primary Health Centre(PHC)of West Fragkista,was calculated and the transportation by ground means was compared with the corresponding time by flying means,to investigate the contribution of air transportation or not,of the timely arrival of the patients in the appropriate health ***,possible helicopter landing locations were identified,using a geographic information system to facilitate the process of air medical transportation in the Municipality of Agrafa.

关键词： Civil air transport mountain areas Landing sites Travel time Greece

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