Martin Desruisseaux created SIS-384:
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Summary: (Affine → Passthrough → Affine) should be simplified as
(Affine → Passthrough)
Key: SIS-384
URL: https://issues.apache.org/jira/browse/SIS-384
Project: Spatial Information Systems
Issue Type: Improvement
Components: Referencing
Affects Versions: 0.8, 0.7, 0.6, 0.5
Reporter: Martin Desruisseaux
Priority: Minor
Fix For: 1.0
Below is an example of concatenated math transform. An "Affine" operation
appears twice: before and after the "Passthrough" operation:
{noformat}
Concat_MT[
Param_MT["Affine",
Parameter["num_row", 5],
Parameter["num_col", 5],
Parameter["elt_0_0", 0.025],
Parameter["elt_0_4", 3.0125],
Parameter["elt_1_1", -0.025],
Parameter["elt_1_4", 44.9875]],
PassThrough_MT[2, 1, Param_MT["Interpolation 1D",
Parameter["values", {2.0, 10.0, 20.0, 35.0, 50.0, 75.0, 100.0, 150.0,
200.0, 250.0, 375.0, 500.0, 625.0, 750.0, 875.0, 1000.0, 1125.0, 1250.0,
1375.0, 1500.0, 1750.0, 2000.0, 2250.0, 2500.0, 2750.0, 3000.0}]]],
Param_MT["Affine",
Parameter["num_row", 5],
Parameter["num_col", 5],
Parameter["elt_3_3", 3600000.0],
Parameter["elt_3_4", 1.5127128E12]]]
{noformat}
The last "Affine" operates only on passthrough coordinates. Consequently it
could be moved before the "Passthrouh" operation, which would allow
concatenation with the first "Affine" operation. It should not change the
operation result, but can improve performance.
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