In this study,MAPGIS software was used in production of basic farmland protection plan maps based on the related practice of Jinkong town,Yanting County,Sichuan Province,China.It was proved that MAPGIS software could ...In this study,MAPGIS software was used in production of basic farmland protection plan maps based on the related practice of Jinkong town,Yanting County,Sichuan Province,China.It was proved that MAPGIS software could improve the efficiency of mapping greatly,and resolved technical problems in basic farmland protection plan mapping.展开更多
This work investigated the land-use/land-cover and some physico-chemical properties of the soils of Mt Cameroon and presented same in maps. ArcGIS Pro mapping software, Landsat images, Global Positioning Systems (GPS)...This work investigated the land-use/land-cover and some physico-chemical properties of the soils of Mt Cameroon and presented same in maps. ArcGIS Pro mapping software, Landsat images, Global Positioning Systems (GPS) coordinates collected from the field combined with updated shape files from competent services were used to produce the location and land-use/land-cover maps. Sixteen topsoil samples (0 - 20 cm) were collected, 4 from each land use/cover category: farmland, forest, plantation and settlement, and analysed for soil pH, cation exchange capacity (CEC), bulk density, moisture content and soil texture, in the laboratory using standard analytical procedures. This data was used to produce spatial distribution maps using ordinary kriging, in ArcGIS Pro. The main terrestrial land use/cover categories comprised of the forest (mangrove, lowland, montane and sub-montane), agroforestry, plantations, grassland, settlement, cropland, shrubby savannah, and bare lava. Bulk density showed the highest values in settlement areas and least values under forest land-use categories. Soil moisture content exhibited a reverse trend compared to that of soil bulk density. Forest soils were the sandiest while soils in plantation agricultural land were the most clayey. The soils were slightly acidic to neutral with soils from agricultural land being more acidic (pH<sub>(water)</sub> = 5.43). It is discernible from the results that the conversion from forest to other land use/cover classes enhances soil degradation and that soil physico-chemical properties adequately serve as indicators of soil quality in the Mt Cameroon area.展开更多
Basic surveying and mapping involves a lot of content, which is a systematic and complex work. In actual surveying and mapping, it is necessary not only to improve the accuracy of surveying and mapping, but also to fu...Basic surveying and mapping involves a lot of content, which is a systematic and complex work. In actual surveying and mapping, it is necessary not only to improve the accuracy of surveying and mapping, but also to further improve the efficiency of surveying and mapping. In recent years, UAV technology has developed rapidly, and UAV remote sensing mapping has also become a new surveying and mapping technology. It can use corresponding equipment to control UAVs and photographic equipment to obtain corresponding information. However, the UAV remote sensing mapping technology is still in the initial stage of development at this stage, and further research on practical problems needs to be enhanced when applied in basic surveying and mapping, so as to effectively promote the development of UAV remote sensing mapping technology.展开更多
中国对科创走廊的研究文献自2017年起显著增多,但有关研究相对比较零散。为对国内外科创走廊研究现状进行总结与梳理,发现问题与研究缺口,推进中国情境下科创走廊建设理论的系统建构,以指导科创走廊实践,基于Web of Science数据库中的83...中国对科创走廊的研究文献自2017年起显著增多,但有关研究相对比较零散。为对国内外科创走廊研究现状进行总结与梳理,发现问题与研究缺口,推进中国情境下科创走廊建设理论的系统建构,以指导科创走廊实践,基于Web of Science数据库中的831篇外文文献和中国知网(CNKI)数据库收录的257篇中文文献,应用可视化分析工具CiteSpace,从发文量、研究机构、高被引与共被引文献、研究热点、研究方法等方面对国内外科创走廊的研究进行对比,探讨各自研究特点和研究趋势。研究结果表明:国外研究总体上呈现出波动增长趋势,国内研究表现出与建设实践显著相关,目前处于研究发展期;国外研究核心作者群连接较弱,但已形成高水平大学的核心研究机构群;国内研究未形成核心作者群和核心机构群,缺乏具有高度影响力的文献。上述研究结果在一定程度上表明国外研究更注重科创走廊在基础研究和原始创新能力上的作用,国内研究范围较窄。因此,探讨中国情境下科创走廊建设思路,扬长避短,实现中国科创走廊建设效能最大化应成为未来中国科创走廊的研究重点。展开更多
An accurate and timely land-use map of an area is a valuable geospatial dataset.Making one requires assembling heterogeneous geospatial input data.This becomes computationally expensive as the number of inputs grow or...An accurate and timely land-use map of an area is a valuable geospatial dataset.Making one requires assembling heterogeneous geospatial input data.This becomes computationally expensive as the number of inputs grow or the combinational classification logic becomes more convoluted.We present as a solution an analytical framework based on a DGGS.This provides a spatial data structure that:facilitates horizontal scaling;improves geospatial data interoperability;and makes classified geospatial data easier to reproduce.We demonstrate a benchmark of land-use assignment with a DGGS against the vector and raster geospatial data models.Significant performance benefits are apparent over the vector case,while performance is equivalent to raster.Yet a DGGS has other compelling benefits that makes it more convenient to use in the domain of land-use assignment than the raster data model.展开更多
基金Supported by NSFC(30900138)Open Research Fund of Re-earch Center of Forestry Remote Sensing and Information Engineering,Central South University of Forestry and Technology(RS2008k01)Henan University of Science and Technology Doctor Foundation(09001367)~~
文摘In this study,MAPGIS software was used in production of basic farmland protection plan maps based on the related practice of Jinkong town,Yanting County,Sichuan Province,China.It was proved that MAPGIS software could improve the efficiency of mapping greatly,and resolved technical problems in basic farmland protection plan mapping.
文摘This work investigated the land-use/land-cover and some physico-chemical properties of the soils of Mt Cameroon and presented same in maps. ArcGIS Pro mapping software, Landsat images, Global Positioning Systems (GPS) coordinates collected from the field combined with updated shape files from competent services were used to produce the location and land-use/land-cover maps. Sixteen topsoil samples (0 - 20 cm) were collected, 4 from each land use/cover category: farmland, forest, plantation and settlement, and analysed for soil pH, cation exchange capacity (CEC), bulk density, moisture content and soil texture, in the laboratory using standard analytical procedures. This data was used to produce spatial distribution maps using ordinary kriging, in ArcGIS Pro. The main terrestrial land use/cover categories comprised of the forest (mangrove, lowland, montane and sub-montane), agroforestry, plantations, grassland, settlement, cropland, shrubby savannah, and bare lava. Bulk density showed the highest values in settlement areas and least values under forest land-use categories. Soil moisture content exhibited a reverse trend compared to that of soil bulk density. Forest soils were the sandiest while soils in plantation agricultural land were the most clayey. The soils were slightly acidic to neutral with soils from agricultural land being more acidic (pH<sub>(water)</sub> = 5.43). It is discernible from the results that the conversion from forest to other land use/cover classes enhances soil degradation and that soil physico-chemical properties adequately serve as indicators of soil quality in the Mt Cameroon area.
文摘Basic surveying and mapping involves a lot of content, which is a systematic and complex work. In actual surveying and mapping, it is necessary not only to improve the accuracy of surveying and mapping, but also to further improve the efficiency of surveying and mapping. In recent years, UAV technology has developed rapidly, and UAV remote sensing mapping has also become a new surveying and mapping technology. It can use corresponding equipment to control UAVs and photographic equipment to obtain corresponding information. However, the UAV remote sensing mapping technology is still in the initial stage of development at this stage, and further research on practical problems needs to be enhanced when applied in basic surveying and mapping, so as to effectively promote the development of UAV remote sensing mapping technology.
文摘中国对科创走廊的研究文献自2017年起显著增多,但有关研究相对比较零散。为对国内外科创走廊研究现状进行总结与梳理,发现问题与研究缺口,推进中国情境下科创走廊建设理论的系统建构,以指导科创走廊实践,基于Web of Science数据库中的831篇外文文献和中国知网(CNKI)数据库收录的257篇中文文献,应用可视化分析工具CiteSpace,从发文量、研究机构、高被引与共被引文献、研究热点、研究方法等方面对国内外科创走廊的研究进行对比,探讨各自研究特点和研究趋势。研究结果表明:国外研究总体上呈现出波动增长趋势,国内研究表现出与建设实践显著相关,目前处于研究发展期;国外研究核心作者群连接较弱,但已形成高水平大学的核心研究机构群;国内研究未形成核心作者群和核心机构群,缺乏具有高度影响力的文献。上述研究结果在一定程度上表明国外研究更注重科创走廊在基础研究和原始创新能力上的作用,国内研究范围较窄。因此,探讨中国情境下科创走廊建设思路,扬长避短,实现中国科创走廊建设效能最大化应成为未来中国科创走廊的研究重点。
基金supported by Strategic Science Investment Funding(SSIF)for Crown Research Institutes from the New Zealand Ministry of Business,Innovation and Employment’s Science and Innovation Group contract No.[C09X1704].
文摘An accurate and timely land-use map of an area is a valuable geospatial dataset.Making one requires assembling heterogeneous geospatial input data.This becomes computationally expensive as the number of inputs grow or the combinational classification logic becomes more convoluted.We present as a solution an analytical framework based on a DGGS.This provides a spatial data structure that:facilitates horizontal scaling;improves geospatial data interoperability;and makes classified geospatial data easier to reproduce.We demonstrate a benchmark of land-use assignment with a DGGS against the vector and raster geospatial data models.Significant performance benefits are apparent over the vector case,while performance is equivalent to raster.Yet a DGGS has other compelling benefits that makes it more convenient to use in the domain of land-use assignment than the raster data model.
