Lecture

The Third Dimension: Geographic Information Systems

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Description

This lecture introduces the concept of representing geographic information in three dimensions, focusing on the creation of 3D models using Geographic Information Systems. Topics covered include thematic mapping, visual variables, and the production of thematic maps. The instructor explains the importance of 3D representation for a more concrete and realistic understanding of space and object relationships. Practical aspects such as constructing 3D models using raster formats and draping vector or raster layers are also discussed. The lecture concludes with a demonstration of Qgis2threejs, a plugin for QGIS that enables the visualization of 3D landscapes in a web browser using WebGL technology.

In MOOC

Geographical Information Systems 2

The second part of the course deals with spatial analysis methods and georeferenced information representation techniques. In particular, you will learn how to:

Analyze the spatial properties of discrete variables, for example by quantifying spatial autocorrelation;
Work with continuous variables (sampling, interpolation and construction of isolines)
Use digital elevation models (DEMs) and their derivatives (slope, orientation, etc.);
Use geodata superposition techniques;
Produce cartographic docu

Official source

Quiz

Ontological neighbourhood

Earth science

Technical geography: Geographic information systems

Related concepts (25)

Thematic map

A thematic map is a type of map that portrays the geographic pattern of a particular subject matter (theme) in a geographic area. This usually involves the use of map symbols to visualize selected properties of geographic features that are not naturally visible, such as temperature, language, or population. In this, they contrast with general reference maps, which focus on the location (more than the properties) of a diverse set of physical features, such as rivers, roads, and buildings.

Raster graphics

In computer graphics and digital photography, a raster graphics represents a two-dimensional picture as a rectangular matrix or grid of square pixels, viewable via a computer display, paper, or other display medium. A raster is technically characterized by the width and height of the image in pixels and by the number of bits per pixel. Raster images are stored in s with varying dissemination, production, generation, and . The printing and prepress industries know raster graphics as contones (from continuous tones).

Geographic information system

A geographic information system (GIS) consists of integrated computer hardware and software that store, manage, analyze, edit, output, and visualize geographic data. Much of this often happens within a spatial database, however, this is not essential to meet the definition of a GIS. In a broader sense, one may consider such a system also to include human users and support staff, procedures and workflows, the body of knowledge of relevant concepts and methods, and institutional organizations.

Web mapping

Web mapping or an online mapping is the process of using maps, usually created through geographic information systems (GIS) on the Internet, more specifically in the World Wide Web (the Web). A web map or an online map is both served and consumed, thus, web mapping is more than just web cartography, it is a service where consumers may choose what the map will show. The advent of web mapping can be regarded as a major new trend in cartography.

QGIS

QGIS is a free and open-source cross-platform desktop geographic information system (GIS) application that supports viewing, editing, printing, and analysis of geospatial data. QGIS functions as geographic information system (GIS) software, allowing users to analyze and edit spatial information, in addition to composing and exporting graphical maps. QGIS supports raster, vector and mesh layers. Vector data is stored as either point, line, or polygon features. Multiple formats of raster images are supported, and the software can georeference images.

Related lectures (63)

Components and Functions of the Map MOOC: Geographical Information Systems 2

Covers the components and functions of thematic mapping, including visual variables, map production, and interactive mapping.

3D Representation: Geographic Information Systems

Covers thematic mapping, visual variables, and 3D modeling in Geographic Information Systems.

Map Design: Labeling and Production MOOC: Geographical Information Systems 2

Explores map design principles, emphasizing labeling and production techniques for effective communication of geographical information.

Thematic Attributes and Classification

Covers thematic attributes, classification, data representation, and discretization methods in geographic information systems.

Thematic attributes and classification MOOC: Geographical Information Systems 2