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Introduction to GIS

Introduction to GIS

Geographic Information Systems (GIS) are tools for storing, analyzing, and displaying spatial data alongside related attributes. Unlike traditional information systems that address general queries, GIS incorporates spatial components, enabling users to answer "where" and "how far." For example, GIS can process housing data linked to geographic locations like zip codes, allowing insights into population density or housing distribution through thematic maps.GIS integrates technologies such as...

Thematic Layering in GIS

Thematic Layering in GIS

In the past, planning projects such as schools or public facilities required extensive manual effort to gather and compile data. Information such as property boundaries, soil characteristics, road networks, zoning regulations, and flood zones had to be sourced individually from courthouses, utility providers, and registry offices. Assembling these datasets into a coherent format often took several months, delaying project timelines.The introduction of Geographic Information Systems (GIS)...

GIS Software, Hardware, and Sources of GIS Data

GIS Software, Hardware, and Sources of GIS Data

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...

Levels of Use of a GIS

Levels of Use of a GIS

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...

Applications of GIS: Disaster Management and Emergency Response

Applications of GIS: Disaster Management and Emergency Response

Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...

Selected Data About Geographic Locations

Selected Data About Geographic Locations

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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Related Experiment Video

Updated: Apr 27, 2026

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

Published on: September 12, 2017

[Spatial-temporal evolution characterization of land subsidence by multi-temporal InSAR method and GIS technology].

Bei-Bei Chen, Hui-Li Gong, Xiao-Juan Li

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|July 11, 2014

Summary

Long-term resource over-exploitation causes land subsidence. Complex urban development influences settlement trends, with simpler development leading to less land uneven settlement.

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Published on: May 1, 2018

In Situ Soil Moisture Sensors in Undisturbed Soils

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Last Updated: Apr 27, 2026

Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management

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Published on: September 12, 2017

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Published on: May 1, 2018

In Situ Soil Moisture Sensors in Undisturbed Soils

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

Area of Science:

Geodesy and Remote Sensing
Geoinformatics
Environmental Science

Context:

Regional land subsidence is a growing concern due to increased resource extraction and static/dynamic loads.
Beijing's plain area faces challenges from long-term underground resource over-exploitation.
Urban development and land utilization patterns significantly impact subsidence dynamics.

Purpose:

To monitor and analyze regional land subsidence in Beijing using advanced remote sensing techniques.
To investigate the relationship between complex spatial development and uneven land settlement patterns.
To understand the time-series evolution characteristics of uneven settlement.

Summary:

Utilized multi-temporal Interferometric Synthetic Aperture Radar (InSAR) with Persistent Scatterer (PS) and Small Baseline (SB) approaches on 29 Envisat ASAR images.
Analyzed five typical settlement areas using land-use, multi-spectral imagery, geological data, and Geographic Information System (GIS) spatial analysis.
Found that complex spatial development and utilization situations influence uneven settlement trends, with simpler development correlating to smaller settlement gradients.

Impact:

Provides crucial data for understanding and mitigating land subsidence in urban environments.
Highlights the role of urban planning and resource management in controlling subsidence.
Offers a methodology for analyzing uneven settlement patterns in other subsidence-prone regions.