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Pixel values

The Pixel Values chart source renders a spectral signature — one trace per pixel sample, with band index on the X axis and pixel value on the Y axis — from a multi-band Cloud Optimized GeoTIFF on the layer.

Pixel Values selected with no COG warning

When to use

  • Hyperspectral or multi-band imagery (Sentinel-2, Landsat, EnMAP, PRISMA).
  • Letting users click a pixel and see its full spectral profile.

Configure

  1. Add at least one COG data source to the layer's Datasets tab. The Pixel Values source type is disabled until a COG is present.
  2. In the layer's Charts tab, click Add Chart and choose Pixel Values.
  3. The X axis is auto-populated with band labels read from the COG metadata (or Band 1, Band 2, … if no labels are available).
  4. Each Y trace represents one sampled pixel; the runtime adds a trace per click on the map.

Notes

  • Performance guards limit metadata reads on very large hyperspectral COGs — see the COG performance guards memory.
  • BSQ-interleaved COGs are detected and downloaded band-by-band; BIP COGs stream all bands together.