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相关概念视频

Migration00:53

Migration

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Cell Migration01:19

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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

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Geographic Information Systems (GIS) rely on two core types of data: spatial data and attribute data.Spatial DataSpatial data defines the physical location of features within a coordinate system, typically expressed in terms of latitude and longitude. It provides precise positioning for elements like roads, rivers, or buildings.Attribute DataAttribute data complements spatial data by adding descriptive information about these features. For example, a road's spatial data includes its start and...
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GIS Software, Hardware, and Sources of GIS Data01:23

GIS Software, Hardware, and Sources of GIS Data

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A Geographic Information System (GIS) combines specialized software and hardware to effectively manage, analyze, and present spatial and related data. GIS software includes critical functionalities such as a user interface for easy navigation, database management tools for handling spatial and attribute data, and data retrieval features for efficient access. Analytical tools transform raw data into insights, while display functions produce maps and reports in various formats for effective...
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Levels of Use of a GIS01:29

Levels of Use of a GIS

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Geographic Information Systems (GIS) operate across three levels of application, each representing an increasing degree of complexity: data management, analysis, and prediction. These levels reflect the expanding functionality and versatility of GIS technology in handling spatial data for diverse purposes.Data ManagementAt its foundational level, GIS serves as a tool for data management, enabling the input, storage, retrieval, and organization of spatial data. This level is often employed in...
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Trajectory Data Analyses for Pedestrian Space-time Activity Study
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通过高分辨率数据揭示了2000-2019年世界人类迁徙模式.

Venla Niva1, Alexander Horton2, Vili Virkki2

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概括
此摘要是机器生成的。

这项研究量化了2000年至2019年的全球移民模式,揭示了社会经济因素驱动的移动比气候更重要. 对于有效的移民政策和管理而言,地方分析至关重要.

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科学领域:

  • 人口统计学 人口统计学
  • 人类地理的人类地理
  • 社会经济学 社会经济学

背景情况:

  • 全球移民是一个重要的公共和政治问题,但缺乏关于其规模和驱动力的高分辨率数据.
  • 了解移民模式对于解决全球人口动态和资源分配至关重要.

研究的目的:

  • 创建一个高分辨率的全球数据集2000年至2019年的年度净迁移.
  • 在全球范围内识别和分析移民的主要驱动因素.
  • 突出地方移民分析对政策和国际合作的重要性.

主要方法:

  • 开发了216个国家的全球净移民数据集 (~10公里网格),使用缩小规模的次国家出生和死亡率.
  • 利用报告的人口普查数据和行政单位信息进行人口分析.
  • 分析了与社会经济和地质物理因素相关的移民模式.

主要成果:

  • 在2000年至2019年期间,全球量化年度净迁移.
  • 发现社会经济因素比气候因素更强烈地与移民有关.
  • 观察到,大约50%的城市人口生活在移民推动增长的地区,全球三分之一的人口居住在农村净移民积极的省份.

结论:

  • 对于有效的政策设计和管理来说,对移民的地方性分析至关重要.
  • 社会经济驱动因素在移民中扮演着比气候因素更重要的角色.
  • 开发的数据集为了解和管理内部和国际移民提供了宝贵的资源.