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Level 2A relative geometric disparity metrics

This metadata file summarises the comparison between the different bands of an image. Tiepoints are collected for both bands.

Tiepoints are collected between different band combinations of an image. The distances between these corresponding tiepoints are measured.

note

The tiepoints collected during the quality assessment are collected independently of the tiepoints collected during processing.

The relative geometric verification metadata file is similar to the absolute geometric verification metadata file. However, the relative geometric verification metadata file contains measurements between the band combinations that were measured.

Sample file​

Sample: LANDSAT-9_OLI_20220804T083603_20220804T083634_L2A_R1C1_GVER_REL.json

Property details​

This section contains explanations on specific properties of the relative geometric disparity metrics file. All the properties are listed in a structured manner under the Reference section.

Pixel colour mappings​

This section describes the pixelColorMappings property. This provides a legend to quantify disparities in colour ranges. This legend is used for the thumbnail referenced in imageName.

Reference: relative geometric disparity metrics​

The following reference describes the content of the relative geometric disparity metrics file.

  • measurements (array): A list of disparity metrics grouped by individual bands.
    • Items (object)
      • coordsLonLat (array): The (longitude, latitude) coordinates of the evaluated tie-points.
        • Items (array)
          • Items (number, format: double)
      • coverage (integer, format: int32): Total percentage of the scene that could be evaluated by the tie-points.
      • disparitiesXYInMeters (array): A list of (x,y) disparities of the evaluated tie-points (in meters).
        • Items (array)
          • Items (number, format: double)
      • from (string): The band ID of the source used during comparison.
      • imageName (string): An illustration of the quality of all the tie-points evaluated on the image.
      • to (string): The band ID of the target used during comparison.
  • pixelColorMappings (string): Mappings used to quantify disparities in color ranges (only for display purposes).