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Multiband Zonal Stats

Multiband Zonal Stats

A QGIS Processing plugin for producing tidy zonal-statistics CSV files from multiband rasters and polygon or multipolygon layers.

Overview

Multiband Zonal Stats summarises a multiband raster over the polygons of a vector layer and writes a clean CSV. It is purpose-built for multiband rasters — processing every band in one pass, something QGIS's own zonal-statistics tools do not do.

Instead of re-reading the raster once per polygon (the slow, classic pattern), it reads the raster in bounded tiles and aggregates every zone and band together with NumPy — so the work scales with the raster area touched, not with polygons × bands.

See it in action

The Multiband Zonal Stats dialog in QGIS

The dialog: continuous/categorical tabs, exclude values, decimal places, a live histogram preview, and an About panel.

Key features

  • Multiband, one pass

    Every selected band aggregated together — no looping the tool per band.

  • Continuous statistics

    Count, nodata, min, max, sum, mean and population standard deviation.

  • Categorical statistics

    Majority, minority, variety, class breakdown, and class-count columns.

  • Histogram preview

    See any band's distribution before running — binned or per-class.

  • Exclude values

    Drop pixel values like 0 (out-of-boundary) as extra nodata.

  • Fast & bounded

    Tiled reads, bounded memory, correct handling of overlapping zones.

Quick example

A categorical land-cover raster over two districts, in the class-counts layout:

fid,polygon_id,polygon_name,band_index,band_name,class_1,class_2,class_3,class_4
1,101,North,1,landcover,4,4,5,3
2,102,South,1,landcover,7,4,1,4

Every row starts with a unique fid, and the columns are the union of classes across all zones.

Getting started

Ready to summarise your rasters?

Get Started Installation Guide

Requirements

  • QGIS version: 3.34 or higher (runs on QGIS 3.34 – 4.x from one code path)
  • Raster source: file-based (GDAL) — export WMS/tiled layers to GeoTIFF first
  • Dependencies: none beyond the GDAL and NumPy that ship with QGIS

Support

Found a bug or want a feature? Open an issue on GitHub.