Archive
Category: QGIS plugins
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➤ QGIS Visibility Analysis
➤ QGIS Terrain Shading
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Topographic position index (TPI): a Python implementation
Topographic position index (TPI) is a method of terrain classification where the altitude of each data point is evaluated against its neighbourhood. In a…
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Texture shading for QGIS
Starting with 0.9.2 version, QGIS Terrain shading plugin is equipped with the exquisit terrain shading algorithm, devised for terrain cartography by Leland Brown (refs.…
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Hillshade in QGIS: how does it work ?
Figure 1. Hillshade model of Požega valley (Croatia). Hillshade modelling is a standard form of terrain representation in cartography. The idea is to simulate…
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Visibility index (total viewshed) for QGIS : finally there!
Welcome visibility index algorithm, a.k.a. total viewshed, now available in QGIS Visibility analysis plugin. This metric informs us on the size of the visual…
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Distance and direction filters for QGIS Viewshed analysis
Viewshed analysis produces a model of visible areas from a chosen point, given a 2.5 or 3D elevation model. Most often, we model full…
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Viewshed analysis in QGIS 3: a tutorial
Viewshed analysis denotes field of vision modelling in GIS jargon. The term is quite awkwardly borrowing its suffix from watershed, even if there is…
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Ambient occlusion and sky-view factor for QGIS
Ambient occlusion is a concept developed in 3D modelling and visualisation which is used to evaluate the exposition to the ambient light of each…
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DEM shading algorithm for QGIS
I’ve been seeing on the net more and more of beautiful maps made in 3D software, Blender mostly. The reason for venturing into 3D:…
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Intervisibility analysis in QGIS: an archaeological tutorial
Intervisibility analysis tests the potential for visual connection between two observers. I say potential because visibility on landscape scale is often the question of…
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Enhancing terrain cartography with natural shadows
QGIS algorithm for natural shadow modelling. Introduction Modelling natural illumination is quite difficult in software for digital cartography. Yes, we do have hillshading algorithms,…