ancillary.multilook_factors: reimplementation

[johntruckenbrodt]

The old implementation failed in cases where the range spacing is larger than the azimuth spacing and the target spacing.

Example:

rglks, azlks = multilook_factors(
    source_rg=7.8,
    source_az=4.1,
    target=10,
    geometry="SLANT_RANGE",
    incidence=23.3
)

old:

• factors (1, 2)
• ground range spacing (19.72, 8.2)

new:

• factors (1, 5)
• ground range spacing (19.72, 20.5)

The new approach now tries to equally minimize the difference between

• output azimuth spacing and target spacing
• output range spacing and target spacing
• output range and azimuth spacing

The pixel is thus as close to the target spacing as possible in both range and azimuth and as "square" as possible.

[coveralls]

Pull Request Test Coverage Report for Build 19705459105

Details

• 35 of 38 (92.11%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.0%) to 54.008%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyroSAR/ancillary.py	35	38	92.11%

Files with Coverage Reduction	New Missed Lines	%
pyroSAR/S1/auxil.py	1	42.31%

Totals
Change from base Build 19334028516:	1.0%
Covered Lines:	3989
Relevant Lines:	7386

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💛 - Coveralls