sec_interp.gui.adapters.profile_extractor module

Profile extraction adapter (Extract phase).

Bridges the QGIS object world and the QGIS-agnostic core layer for topographic profiles. It reads the section line and samples elevations from a DEM raster, returning a plain ProfileData list of (distance, elevation) tuples.

class sec_interp.gui.adapters.profile_extractor.ProfileExtractor

Bases: object

Extract topographic profile data from QGIS layers into primitives.

calculate_lod_interval(line_lyr: qgis.core.QgsVectorLayer, canvas_width: int, feature_id: int | None = None) → float | None

Compute the LOD sampling interval from the section line length.

Parameters:

  • line_lyr – The cross-section line layer.

  • canvas_width – Current width of the preview canvas in pixels.

  • feature_id – Section feature id (first feature when None).

Returns:

The sampling interval, or None if the line length is unavailable.

extract_profile(line_lyr: qgis.core.QgsVectorLayer, raster_lyr: qgis.core.QgsRasterLayer, band_number: int = 1, interval: float | None = None, feature_id: int | None = None) → list[tuple[float, float]]

Sample elevation along a section line into a detached profile.

Parameters:

  • line_lyr – The cross-section line layer.

  • raster_lyr – The DEM/raster layer for elevation.

  • band_number – Raster band to sample (default: 1).

  • interval – Optional sampling interval. If None, uses raster resolution.

  • feature_id – Section feature id (first feature when None).

Returns:

A list of (distance, elevation) tuples representing the profile.

Raises:
tr(message: str) → str

Translate a message using QCoreApplication.