检索结果-南通市图书馆

Automated tree detection and crown delineation using airborne laser scanner data in heterogeneous east-central europe forest with different species mix

引用

Journal of Forestry Research 2017年第5期28卷 1049-1059页

作者： Róbert Smreek Ivan Sakov Zuzana Michnová Ján Tuek Department of Forest Management and Geodesy Technical University in Zvolen Department of Forest Policy Economics and Forest ManagementNational Forest Centre-Forest Research Institute Zvolen

Identifying tree locations is a basic step in the derivation of other tree parameters using remote sensing techniques, particularly when using airborne laser scanning. There are several techniques for identifying tree positions. In this paper, we present a raster-based method for determining tree position and delineating crown coverage. We collected data from nine research plots that supported different mixes of species. We applied a raster-based method to raster layers with six different spatial resolutions and used terrestrial measurement data as reference data. Tree identification at a spatial resolution of 1.5 m was demonstrated to be the most accurate, with an average identification ratio (IR) of 95% and average detection ratio of 68% being observed. At a higher spatial resolution of 0.5 m, IR was overestimated by more than 600%. At a lower spatial resolution of 3 m, IR was underestimated at less than 44% of terrestrial measurements. The inventory process was timed to enable evaluation of the time efficiency of automatic methods.

关键词： Airborne laser scanning east-central europe Individual tree Mixed forest Tree crown delineation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Long-term changes and periodicity of ice phenomena in the high mountain Lake Morskie Oko(Tatra Mountains,Western Carpathians)

引用

Journal of Mountain Science 2022年第11期19卷 3063-3075页

作者： POCIASK-KARTECZKA Joanna NIECKARZ Zenon CHOIŃSKI Adam Institute of Geography and Spatial Management Jagiellonian UniversityKraków 30387Poland Marian Smoluchowski Institute of Physics Jagiellonian UniversityKraków 30348Poland Institute of Physical Geography and Environmental Planning Adam Mickiewicz University in PoznańPoznań61680Poland

High montain lakes are regarded as sensitive indicators of environmental changes in local and global *** recent years,climate change has considerablely influenced the timing of ice phenomena in these *** objective of the paper is an investigation of long-term changes and periodicity of ice phenomena in high mountain Lake Morskie Oko(1392.8 m a.s.l.)located in the Tatra *** the period *** study employed the Lomb-Scargle periodogram,linear regression modelling for temporal trends,correlation analysis,parameters of variability,and flashiness *** of the duration of ice phenomena(~5.4 y)and ice cover on the lake(~13.5 y)was observed,although both are statistically *** cover duration has been interrupted several times by winter thaws after 1996 whereas no such events had been reported *** trend towards a delayed appearance of ice phenomena reaches 4.0 d·decade^(-1)(p<0.001).The observed trend towards an earlier ice phenomena disappearance reaches 5.1 d·decade^(-1)(p<0.001).It results in a decline of the number of days with ice phenomena on Lake Morskie Oko at a rate of 9.0 d·decade^(-1)(p<0.001).The duration of ice cover on Lake Morskie Oko has been decreasing at a rate of 10.4 d·decade^(-1).It is attributed to later freezeup(3.9 d·decade^(-1),p<0.001)and earlier ice break-up(5.6 d·decade^(-1),p<0.001).An increasing trend of average annual air temperature(0.4°C·decade^(-1),p<0.001)in the period 1971-2020 is observed.A statistically significant correlation is recorded between ice phenomena and ice cover(beginning,end,duration),average annual air temperature,average air temperature of three summer months(June,July,August),and average air temperature of the six months period from June to *** air temperature induces growing heat resources accumulated in the lake water in the summer and autumn seasons,potentially causing later initiation of ice phenomena in the *** is no statistically significant r

关键词： Ice phenomena Lakes High mountains Climate warming east-central europe

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Is There Such Thing as ＇Populist Constitutionalism＇？ The Case of Hungary

引用

Fudan Journal of the Humanities and Social Sciences 2018年第3期11卷 323-339页

作者： Gabor Halmai european University Institute Florence Italy

The paper deals with recent deviations from the shared values of con- stitutionalism towards a kind of ＇populist, illiberal constitutionalism＇ introduced by Hungary＇s new constitution in 2011. The populism of FIDESZ was directed against all elites, including the ones that designed the 1989 constitutional system （in which FIDESZ also participated）, claiming that it was time for a new revolution. This is why PM Viktor Orban characterized the results of the 2010 elections as a ＇revo- lution of the ballot boxes＇. His intention with this revolution was to eliminate all checks and balances, and even the parliamentary rotation of governing parties. His vision for a new constitutional order----one in which his political party occupies the centre stage of Hungarian political life and puts an end to debates over values has now been entrenched in the new constitution. The paper argues that this current Hungarian constitutional system was made possible by FIDESZ＇ anti-pluralist nationalist populism, but is not necessarily based on a true commitment to expressing the will of the people via ＇illiberal constitutionalism＇. The populist government rather misuses the country＇s lack of constitutional culture. Adherence to constitutional patriotism would mean that FIDESZ would have to endorse what John Rawls once called ＇constitutional essentials＇. The core of this kind of con- stitutional patriotism is a constitutional culture centred on universalist liberal democratic norms and values. Instead, the current Hungarian constitutional system is confronted with unconstitutional patriotism, a kind of nationalism that violates constitutional essentials in the name of ＇national constitutional identity＇.

关键词： Populism Constitutionalism Illiberal democracy Hungary east-central europe

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：