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 non-man-made features on their sites, features that apparently gained a symbolic value before or during human habitation. For instance, trees...
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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, le BD ALTI de résolution de 25 mètres (lien dessus). Celui-ci est disponible en valeurs entières, ce que lui donne...
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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!
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Le géosymbole vu par l’archéologie
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 with Numpy is the implementation of various looping routines, such as the sliding window which is frequently used in image...
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