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Analysis tools

Open Explore, expand a compatible source, and use the + action in Analysis layers. Its tooltip is Generate analysis layers. Tool availability depends on the selected source and image type.

Analysis menu​

Exploratory analysis:

  • Color composite: create an RGB or false-color composite.
  • Band math: generate a spectral-index or custom-formula layer.
  • Principal components analysis (PCA): reduce hyperspectral data into principal components.
  • Endmembers extraction: extract candidate pure spectra from an image.
  • Reed-Xiaoli anomaly detection (RX): generate anomaly-detection output.

Guided analysis:

  • Matched filter: detect a target reference spectrum.
  • Mixture-tuned Matched Filter (MTMF): run MTMF against a target reference spectrum.
  • Model inference: apply a trained model to compatible HSI data.

Import:

  • Import raster: attach an externally generated raster result to the source.

The menu contains analysis actions only. Workspace resources such as reference spectra, label settings, and Clarity AI have separate entry points.

Choose the target image​

Analysis runs against the image associated with the source whose Analysis layers action you used. An action is disabled when that source does not have a compatible image.

Several tools also let you choose a source data layer, such as raw, radiance, or reflectance. The current or primary image layer is selected by default when possible.

Configure wavelength ranges​

PCA, endmember extraction, matched filter, MTMF, RX, and reference-spectra workflows can use image-specific or workspace wavelength filters. Enter band ranges such as 0-100, 150-200, 222, or wavelength ranges in nanometers such as 400-700, 800-900.

Open Analysis from the right tool rail, open an analysis tab, and click Workspace settings to change Center wavelengths. An image-specific filter overrides the workspace default for that image.

Add reference spectra​

Reference spectra are library spectra linked to a workspace source. They appear in the source's Reference spectra section in Explore and can be plotted in Spectral Signatures.

To add a reference spectrum:

  1. Open Explore and expand a source.
  2. Expand Reference spectra.
  3. Click Add reference spectrum.
  4. Select a spectral signature in the library dialog.
  5. Click Add reference.

Create library spectra from labels​

After creating labels, right-click one or more labels and choose Add to spectral library. When several labels are selected, the dialog can create an averaged signature and lets you choose the target library.

Identify materials​

Right-click a label and choose Identify material to compare its spectral signature with configured library spectra. Use Workspace settings > Material identification to choose the libraries, chapters, and preprocessing method used for matching.

After identification finishes, use Plot identified material to add the matches to Spectral Signatures.

Run matched filter or MTMF​

Matched filter and MTMF require a target reference spectrum. Their dialogs let you choose the image data layer, target reference spectrum, optional background class, and wavelength range. Additional parameters appear when they apply to the selected method.

The completed result appears in Analysis layers. Select it to inspect its display settings, statistics, and metadata.

Extract endmembers​

Endmember extraction asks for the image data layer, number of endmembers, extraction method, and wavelength range. Completed outputs appear below the source as result layers.

Generate PCA​

PCA generation asks for the image data layer, result description, number of components, and wavelength range. Select a completed PCA layer to open its PCA · <name> tab in the Analysis tray.

Commit an operation chain​

Some layer operations can be staged before they are committed. When a staged chain exists, Spectral Explorer opens Operation Chain in the Analysis tray. Review the preview, then commit or cancel the chain before starting an unrelated operation.