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相关概念视频

Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

15
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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Levels of Use of a GIS01:29

Levels of Use of a GIS

15
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...
15
Manipulation and Analysis01:21

Manipulation and Analysis

13
GIS manipulation and analysis functions are vital for decision-making and planning. These activities range from data retrieval tasks, such as selecting information based on specific criteria, to advanced analytical techniques that address complex spatial problems.One critical GIS analysis method is overlaying, which combines multiple data layers to examine impacts. For example, overlaying a river-dammed lake boundary with road networks can identify affected infrastructure. Another common...
13
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

14
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

448
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
448
Stereotype Content Model02:16

Stereotype Content Model

13.9K
The Stereotype Content Model (SCM) was first proposed by Susan Fiske and her colleagues (Fiske, Cuddy, Glick & Xu, 2002; see also Fiske, 2012 and Fiske, 2017). The SCM specifies that when someone encounters a new group, they will stereotype them based on two metrics: warmth—or that group’s perceived intent, and how likely they are to provide help or inflict harm—and competence—or their ability to carry out that objective. Depending on the warmth-competence...
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相关实验视频

Updated: May 9, 2025

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition
05:15

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition

Published on: February 19, 2018

10.7K

一个基于空间影响的位置语义隐私保护模型.

Linghong Kuang1,2, Wenlong Shi1,2, Xueqi Chen1,2

  • 1School of Computer Science and Mathematics, Fujian University of Technology, Fuzhou, 350118, China.

Scientific reports
|April 30, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了基于空间影响 (LSPPM-SI) 的新型位置语义隐私保护模型,以保护用户轨迹数据. 该模型增强了数据可用性和对复杂隐私攻击的语义保护.

关键词:
这就是K-匿名性.多样化的语义学.模拟轨迹合成的模拟轨迹语义隐私 语义隐私 是一个隐私.空间影响空间的影响.

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相关实验视频

Last Updated: May 9, 2025

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition
05:15

The Spatial Memory Game: Testing the Relationship Between Spatial Language, Object Knowledge, and Spatial Cognition

Published on: February 19, 2018

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Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data

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科学领域:

  • 计算机科学 计算机科学
  • 数据 隐私 数据 隐私 数据
  • 地理信息系统 地理信息系统

背景情况:

  • 基于位置的服务产生了大量的轨迹数据,对洞察有价值,但会带来隐私风险.
  • 现有的隐私方法往往忽视了位置语义和兴趣点的影响,使轨迹变得脆弱.
  • 语义攻击利用轨迹数据,需要先进的隐私保护模型.

研究的目的:

  • 提出基于空间影响 (LSPPM-SI) 的位置语义隐私保护模型,抵抗语义攻击.
  • 提高交通轨迹数据的可用性和语义保护.
  • 为了解决现有的k-匿名集构造方法的局限性.

主要方法:

  • 开发了一个位置语义挖掘算法,通过定位语义来分类停留点.
  • 引入了多样化的语义模拟位置选择算法,并利用希尔伯特曲线来实现高效的匿名性.
  • 定义了兴趣点的空间影响,以验证虚拟轨迹,并使用Kuhn Munkres算法来生成最佳的k-匿名集.

主要成果:

  • 拟议的LSPPM-SI模型显著提高了14%的交通轨迹数据可用性.
  • 与传统模型相比,语义保护性能提高了46.5%.
  • 有效地阻止攻击者通过空间影响验证识别虚拟轨迹.

结论:

  • LSPPM-SI为保护轨迹数据中的位置语义提供了一个强大的解决方案.
  • 该模型平衡了数据实用性与强有力的隐私保证,以抵御先进攻击.
  • 这种方法推进了基于位置的服务的隐私保护数据挖掘领域.