Raster Threshold Mask

Creates a filtered raster where only pixels above or below your threshold are retained — everything else becomes transparent NoData. Set a threshold of 0.4 on an NDVI raster and only healthy vegetation pixels survive.

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What you get

raster_mask_generator.py

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What it does

Greater-than or less-than modes

Keep pixels above the threshold (e.g. NDVI > 0.4 for healthy vegetation) or below it (e.g. elevation < 850 m for low-lying zones).

Any single-band raster

Works with NDVI, elevation, CHM, or any single-band raster loaded into QGIS — not limited to specific layer types.

NoData masking

Filtered-out pixels are set to NoData (transparent in QGIS), making the masked raster easy to overlay on other layers.

Configurable nodata value

Set nodata to None (NaN), -9999, or any value — useful for compatibility with downstream GIS tools.

How to use it

1
Load your raster (NDVI, CHM, elevation, etc.) into QGIS and check (tick) it in the Layers panel.
2
Open Plugins → Python Console → Show Editor.
3
Paste the script. At the bottom set threshold (numeric cutoff), comparison ("greater_than" or "less_than"), and optionally nodata.
4
Click Run.

Requirements

QGIS 3.28 or newer
QGIS processing framework — bundled
First checked raster layer in the Layers panel

Also in the Vegetation & Field Analysis Pack

Get all 6 vegetation scripts for $40 — save $20 vs buying individually.

View bundle