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Terrain Analysis Symbology QGIS 4 compatibility
Not QGIS 4 ready Active
Not yet — the latest version declares max QGIS version 3.99.0, so it is not offered to QGIS 4 users.
Symbolize slope/aspect rasters with the Van Zuidam (1983) classification and compass-direction classes, plus an Aspect-Slope Bivariate Overlay (combined hue/saturation raster, with optional hillshade-blended brightness).
About
Adds three Processing algorithms for terrain-derived raster visualization. "Van Zuidam (1983) Slope Classification Symbology" classifies a slope raster into the 7 standard Van Zuidam geomorphological classes (Flat through Extremely Steep, in Degree or Percent) and applies a Singleband Pseudocolor (Discrete) renderer with class-name legend labels. "Aspect Direction Symbology (Compass Classes)" classifies an aspect raster into 4 or 8 compass-direction classes (N/E/S/W or N/NE/E/SE/S/SW/W/NW), each centered on its true compass direction, using a cyclic HSV color wheel suited to circular data, with an optional compass-rose preview. "Aspect-Slope Bivariate Overlay" combines a Slope raster and an Aspect raster into one new RGB(A) raster (hue=aspect, saturation=slope steepness), following the classic aspect-slope mapping technique of Moellering & Kimerling (1990) and Brewer & Marlow (1993), with an optional Hillshade input (Kennelly & Kimerling, 2001) that blends real relief shading into the brightness channel instead of a flat constant -- see README for references. The first two algorithms only change the input layer's symbology; the third creates a new raster file, since QGIS has no live renderer that can combine two input rasters into one color. Co-developed by Muhammad Fatahillah Mubarak together with Claude (Anthropic) as a coding assistant.
| Author | Muhammad Fatahillah Mubarak, with Claude (Anthropic) |
|---|---|
| Downloads | 224 |
| Latest version | 1.2.1 (experimental) |
| Last updated | 2026-08-21 (56 days ago) |
| Min QGIS | 3.18.0 |
| Max QGIS | 3.99.0 |
| QGIS 4 ready | No |
| Maintenance | Active |
| Categories | Raster & terrain, Cartography & layout |
| Tags | raster, symbology, classification, terrain, slope, aspect, van zuidam, geomorphology, compass, direction, color ramp, pseudocolor, bivariate, aspect-slope map, overlay |
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