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Levels of Use of a GIS01:29

Levels of Use of a GIS

366
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...
366
Selected Data About Geographic Locations01:25

Selected Data About Geographic Locations

261
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...
261
GIS Software, Hardware, and Sources of GIS Data01:23

GIS Software, Hardware, and Sources of GIS Data

754
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...
754
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

348
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
348
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

382
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...
382
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

323
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
323

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相关实验视频

Updated: Jan 18, 2026

Reefshape: A System for the Efficient Collection and Automated Processing of Time-Series Underwater Photogrammetry Data for Benthic Habitat Monitoring
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基于Geohash的高清地图提供系统使用智能RSU.

Wangyu Park1, Jimin Lee1, Changjoo Moon1

  • 1Department of Smart Vehicle Engineering, Konkuk University, Seoul 05029, Republic of Korea.

Sensors (Basel, Switzerland)
|September 13, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了一种新系统,用于使用Geohash索引提供高清 (HD) 地图,用于使用Geohash索引进行自动驾驶. 它显著加快了地图数据的传输速度,并减少了车辆的通信负载.

关键词:
地质哈希 (Geohash) 是一个类型的地质哈希.高清地图 HD地图在PostGIS中,我们可以使用PostGIS.在PostgreSQL 15中使用.智能RSU (路边单元) 是一个智能RSU.

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相关实验视频

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科学领域:

  • 自主驾驶系统 自主驾驶系统
  • 地理空间数据管理
  • 智能运输系统 智能运输系统

背景情况:

  • 高清地图对于自动驾驶的安全性和效率至关重要.
  • 当前的高清地图系统面临着大数据大小和实时更新要求的挑战,影响车载存储和通信.

研究的目的:

  • 提出一个轻量级和可扩展的高清地图提供系统.
  • 通过启用按需地图段请求来减少车辆的存储负担和通信负载.

主要方法:

  • 开发了一个利用Geohash空间索引和智能路边单位 (Smart RSUs) 的系统.
  • 将高清地图数据划分为基于Geohash的空间块,以进行高效的查询.
  • 模拟了多车辆环境,以测试来自智能RSU的地图数据请求.

主要成果:

  • 基于Geohash的方法显示,与基于GPS的方法相比,平均响应时间 (RTT) 提高了296.3%.
  • 在数据库查询性能方面实现了1072.6%的增长.
  • 通过调整Geohash分辨率以适应不同道路密度 (城市与农村) 来展示可扩展性.

结论:

  • 拟议的基于Geohash的系统提供了高清地图交付的高效和实时框架.
  • Geohash的等级性质允许无集成不同分辨率的地图块.
  • 该系统非常适合于自动驾驶中常见的动态和密集的交通环境.