Alteration Mineral Mapping
Draw your licence area and get back a classified alteration map: advanced argillic, phyllic and propylitic, resolved per pixel.
Per-pixel alteration mineralogy separating advanced argillic, phyllic and propylitic assemblages.
A historic mining district in Nevada. Continuum-removed alteration assemblage: advanced argillic (alunite, pyrophyllite) against phyllic (illite, muscovite).
WHAT THE SENSOR SEES
What this layer looks for.
The laboratory reference for each material, and what the sensor's band spacing captures of it. The shaded band marks the range the method reads.
WHAT IT FINDS
What it detects.
| Material | Typical setting | What can confuse it |
|---|---|---|
| Alunite & Pyrophyllite | High-sulfidation epithermal lithocaps and porphyry cores | Strong atmospheric water vapour at the edge of the window |
| Kaolinite & Dickite | Intermediate argillic alteration and weathering horizons | Poorly crystalline smectite clay mixtures |
| Illite & Muscovite (White Mica) | Phyllic alteration shells in porphyry Cu-Mo-Au systems | Dry canopy cellulose, which overlaps the same range |
| Chlorite & Epidote | Distal propylitic alteration haloes | Calcite and dolomite carbonate absorptions |
METHOD
How it works.
Calibrated reflectance goes in, and every pixel is fitted against a public reference library.
Surface reflectance ingest
Scenes are read at the archive's own surface reflectance level. Wherever the instrument measured nothing, that gap is declared and carried through, never interpolated across.
Continuum removal
A convex upper hull is fitted across the working range so the shape of each absorption stands apart from overall brightness.
Least-squares fitting against reference spectra
Continuum-removed features are fitted to laboratory reference spectra using non-negative least squares with wavelength shift.
Evaluability masking
Green canopy, cloud, shadow and low-illumination pixels go into a separate "not evaluated" class, hatched in the legend, transparent on the map, null in exports. Not measured is drawn differently from measured zero.
SPECIFICATIONS
What you get, and what it runs on.
Conditions it needs
Method and checks are documented in Axine Applied Spectroscopy Paper #1 · Section 4.2.
Scope
Reads exposed rock and soil. Vegetated and covered ground is masked out, and nothing here speaks to what lies at depth.
RUN IT OVER YOUR GROUND
Run this layer over your own area.
Order processing over your area of interest, or a tasked capture where the archive has nothing usable. Imagery access is never charged for: a plan buys the models.
COMPLEMENTARY ANALYTICS
Related layers.
Alteration Cluster Detection
Vectorised clustering that pulls out the core hydrothermal hubs and the nodes worth working outward from.
District Prospectivity Ranking
Regional likelihood scoring for hydrothermal systems, backed by leave-one-region-out cross-validation.
Porphyry Cu-Au Vectoring
Vectors toward the hydrothermal centre by tracking how white mica composition shifts across the district.