Topographic position index (TPI) is a method of terrain classification where the altitude of each data point is evaluated against its neighbourhood. In a nutshell, for each data point, i.e. a pixel in raster DEM, we calculate its height difference from the immediate neighbourhood. A detailed explanation can be found...
[Read More]
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. below). The algorithm can be described as a scaleless sharpening filter which permits to visualise height differences within a region without producing a flattened impression (the...
[Read More]
Analyse thermique en archéologie
Ce résumé a été produit pour un projet d’acquisition thermique par drone, mené par l’équipe d’IntelEspace de la Maison des Sciences de l’Homme, Université Clermont Auvergne. Ce petit rapport interne pourrait être utile aux archéologues, et plus largement à tous ceux qui cherchent une brève introduction au sujet.
[Read More]
Combining hillshades: beauty is not all there is to it!
[This is the third post in my series on hillshades: previous ones were on the functionality of QGIS Terrain Shading module and some ramblings on the combination of multiple hillshades.]
[Read More]
Hillshade in QGIS: how does it work ?
As implemented in Terrain Shading module
Figure 1. Hillshade model of Požega valley (Croatia).
[Read More]