Uncategorized – Page 3 – Landscape Archaeology

Some thoughts on hillshade models for Lidar analysis

Hillshade modelling is a standard form of terrain representation in cartography. The idea is to simulate lighting of a terrain from a certain direction (or multiple directions). The method is…

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Installing Python packages in QGIS 3 (for Windows)

Python is in the heart of QGIS (or in the guts if you prefer), which enables us to use tons of third party Python libraries. In Linux systems, QGIS will…

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Natural places and archaeology

First time I heard of something like “natural places” was some ten years ago at a conference in Slovenia. Several, mostly young researchers were proud to demonstrate an existence of…

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Lissage du modèle numérique de terrain BD ALTI

Le problème n’est pas nouveau, mais on ne trouve toujours pas de solutions simples pour le « maquillage » du modèle numérique de terrain (MNT) très couramment utilisé en France,…

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Benchmarking viewshed algorithm: Nuraghi of Sardinia

The new viewshed plugin for QGIS 3 features an improved algorithm which should result in perceptible improvements in terms of efficiency. So let’s give it a try! Nuraghe in Toralba-Sant'Antine…

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Le géosymbole vu par l’archéologie

[Billet remanié et transféré sur fragments.hypothèses.org] Le concept du géosymbole est issu du mouvement culturaliste en géographie, suite au désenchantement, dans les années 80, par les approches structuralistes. Ces dernières…

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Looping through numpy arrays (e.g. moving/rolling window)

Numpy is the cornerstone of matrix based calculations in QGIS (and elsewhere). It does wonders with raster data (unless it hits the limit of available live memory…). A recurrent problem…

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Tanaka method or how to make shaded contour lines

Contour lines have become a commonplace, unassuming companion of our cartographic outputs - GIS has made us forget their visual potential. Already in the 19th century cartographers experimented with shaded…

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My first QGIS map: the aid from Cyrene

Cyrene, Lybia Sometime during the reign of Alexander of Macedon a famine broke out in Greece. We don’t have many documents reporting the gravity of situation; apparently Greece was suffering…

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Polar (circular) diagram

Orientation of geographic features can be an important piece of information, for instance when studying ancient field systems or analysing geological formations. The problem comes when we try to summarise…