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A novel photographic approach for monitoring the structural heterogeneity and diversity of grassland ecosystems

Journal of Plant Ecology 2014年第6期7卷 518-525页

作者： Raphaël Proulx Irene T.Roca Felipe S.Cuadra ian seiferling Christian Wirth Chaire UQTR en Biologie Systémique de la Conservation Universitédu QuébecàTrois-Rivières3351 Des ForgesTrois-RivièresQuebec G9A 5H7Canada Department of Special Botany and Functional Biodiversity Research Institute of Biology IUniversity of LeipzigJohannisallee 21-2304103 LeipzigGermany

Aims Studies that investigate the space-filling heterogeneity of biological struc-tures in plant communities remain *** main objective of this study was to evaluate the relationship between newly developed photo-graphic measures of structural heterogeneity in digital images and plant species composition in the context of a long-term grassland *** We tested a close-range photographic protocol using measures of structural heterogeneity in gray-tone images,namely mean infor-mation gain(MIG)and spatial anisotropy,to assess differences in the compositional(species richness)and functional characteristics(plant height and flowering)of 78 managed grassland *** also implemented a random placement model of community assembly to explore the links between our measures of structural complexity and the geometric pattern of plant *** Findings MIG and spatial anisotropy correlated with the growth and species richness of grassland *** showed that struc-tural heterogeneity in gray-tone digital images is a function of the size distribution and orientation pattern of plant *** easy,fast and non-destructive methodological approach could eventually serve to monitor the diversity and integrity of various ecosystems at different resolutions across space and time.

关键词： biodiversity photography ecosystem integrity texture random placement model

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Apples, oranges and lemons: public sector debt statistics in the 21st century

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Financial Innovation 2020年第1期6卷 611-627页

作者： Mike seiferling School of Public Policy University College LondonLondonUK

In both academic research and policymaking,public sector debt and debt-to-GDP ratios are relied on for a multitude of important economic,political and socioeconomic decisions,especially as public sector balance sheets expand to an unprecedented size in the midst of the 2019–2020 COVID *** reliance on available data from reputable sources often overlooks the question of whether the denominator in this ratio is accurately measured or how well the denominator is understood by the audience interpreting *** on past work in international financial statistics,and making use of a unique and newly created dataset on media reporting of public sector debt,the purpose of this article is to examine the quality,accuracy,interpretation and overall meaningfulness of public sector financial *** main findings suggest that i)most of the world’s governments still do not seem to feel sufficient pressure to voluntarily provide comprehensive financial statistics based on well-defined modern methodological frameworks and ii)high profile financial statistics,which are reported,have become increasingly numerous and complicated,making it difficult for non-experts to know which is most appropriate in the context of their analysis.

关键词： Public finance statistics Economic measurement Public debt Government debt Politics of statistics

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使用谷歌街景评估城市街道景观

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城市规划学刊 2017年第4期 125-126页

作者： LI X RATTI C seiferling I 李翔

美国麻省理工的感知城市实验室(Senseable City Lab)最近使用普遍容易获取的谷歌街景图像数据,开发并改进了一个评估城市街道景观的工具。鉴于街道是组成城市的基本网络之一,也是人、信息的汇聚交流之处,本研究改进的街景分析工具可以... 详细信息

美国麻省理工的感知城市实验室(Senseable City Lab)最近使用普遍容易获取的谷歌街景图像数据,开发并改进了一个评估城市街道景观的工具。鉴于街道是组成城市的基本网络之一,也是人、信息的汇聚交流之处,本研究改进的街景分析工具可以大大促进我们对市民与城市建成环境的相互作用之理解。现有研的数个衡量城市绿色指标,几乎没有针对城市绿色植物对人的感官效益的研究,更不用说

关键词：街景图像谷歌数据源

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