Background Page

Overview

The Background page allows users to visualize and configure background signal subtraction for Lidar data processing. It provides visual tools, parameter inputs, and comparison with climatology to assist with accurate preprocessing.

Layout & Features

This page includes:

  1. Channel Selection: - A dropdown menu for selecting a pair of Lidar signal channels. - Available signals are automatically detected and paired (e.g., analog vs photon-counting).

  2. Data Visualization: - Left: Raw signal data with background overlays (two channels). - Right: Tabbed display with:

    • Slope: computed slope vs climatology.

    • Ozone: ozone concentration profile.

  3. Parameter Configuration:

    Each channel can be individually configured: - Linear regression order - Toggle for logarithmic regression - Toggle for weighting - Minimum and maximum altitude (with units)

  4. Actions and Buttons:

    • Apply new values: tests and compares changes without modifying data.

    • Accept: validates changes and updates data permanently.

    • Show Config: reveals extra XML-based parameters.

    • Save Config: saves modified configuration to file.

User Workflow

  1. Select a signal pair using the channel dropdown.

  2. Review raw signal and background subtraction using the graphs.

  3. Adjust background calculation parameters using the configuration panel: - Altitude range - Regression order - Log and weighting options

  4. Click “Apply new values” to preview the effect.

  5. If the result is satisfactory, click “Accept” to rerun the full preprocessing pipeline.

  6. Optionally, use the Show Config button to inspect and edit advanced XML settings.

Graphs & Interpretation

  • Raw Signal Plot: - Plots the raw signal from two channels. - Background estimation is overlaid for direct comparison.

  • Slope Plot: - Shows the calculated slope compared to climatology. - Useful for verifying signal stability.

  • Ozone Plot: - Displays the retrieved ozone profile. - Climatology is plotted for reference.

Saving Changes

  • Configuration can be updated interactively.

  • Clicking Save Config writes changes into the XML parameter file for future use.

  • Changes are logged with timestamps for traceability.

Remarks

  • Altitude units and signal types are automatically adapted from the configuration.

  • All changes can be undone by reloading the page or reselecting the parameter file.

  • Disabled “Accept” button ensures no accidental data overwriting before previewing.