Add total_horizontal_gradient function and tests #560
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Implements the computation of the total horizontal derivative (THDR) of a potential field grid. This function calculates the square root of the sum of squares of the horizontal derivatives in the easting and northing directions.
Includes tests for: - Agreement with a synthetic model - Rejection of 1D and 3D grids - Handling of grids containing NaN values Ensures correctness and robustness of the total_horizontal_gradient filter.
This was referenced May 11, 2025
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This pull request adds the
total_horizontal_gradientfunction toharmonica._transformations, which computes the amplitude of the horizontal gradient (THDR) of a potential field grid using the horizontal derivatives in the easting and northing directions.It also includes:
This function complements
total_gradient_amplitudeby providing a horizontal-only version frequently used in gravity and magnetic data interpretation.Relevant issues/PRs:
Closes #559