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https://issues.apache.org/jira/browse/SIS-548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Desruisseaux updated SIS-548:
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Issue Type: Bug (was: Improvement)
> Unexpected wraparound during intersection of grid geometries
> ------------------------------------------------------------
>
> Key: SIS-548
> URL: https://issues.apache.org/jira/browse/SIS-548
> Project: Spatial Information Systems
> Issue Type: Bug
> Components: Coverage
> Affects Versions: 1.1, 1.2
> Reporter: Martin Desruisseaux
> Assignee: Martin Desruisseaux
> Priority: Major
> Fix For: 1.3
>
>
> The following test case produces an intersection like below. This
> intersection covers 360° of longitude, while a much smaller intersection was
> expected. This is caused by an unexpected "wraparound" applied by
> {{CoordinateOperationFinder}}.
> {noformat}
> Column: [-179 … 181] (361 cellules)
> Row: [ 3 … 3] (1 cellules)
> {noformat}
> Test cases:
> {code:java}
> public static void main(String[] args) {
> CoordinateReferenceSystem crs = CommonCRS.WGS84.normalizedGeographic();
> AffineTransform2D gridToCrs = new AffineTransform2D(1, 0, 0, -1, -103.5,
> 52.5);
> GridGeometry tilingScheme = new GridGeometry(new GridExtent(1, 1),
> PixelInCell.CELL_CENTER, gridToCrs, crs);
> AffineTransform2D gridToCrs2 = new AffineTransform2D(
> 2.7770063871146905E-4, 0,
> 0, -2.7770063871146905E-4,
> 77.00013885031936,
> 49.99986114968065);
> GridGeometry tileGrid = new GridGeometry(new GridExtent(3601, 3601),
> PixelInCell.CELL_CENTER, gridToCrs2, crs);
> GridExtent intersection = tilingScheme.derive()
> .clipping(GridClippingMode.NONE)
> .rounding(GridRoundingMode.ENCLOSING)
> .subgrid(tileGrid).getIntersection();
> System.out.println(intersection);
> }
> {code}
> {code:java}
> public static void main(String[] args) {
> CoordinateReferenceSystem crs =
> CommonCRS.WGS84.normalizedGeographic();
> AffineTransform2D gridToCrs = new AffineTransform2D(
> 0.0020833333333333333, 0,
> 0, -0.0020833333333333333,
> -179.99895833333332,
> -45.001041666666666);
> GridGeometry tilingScheme = new GridGeometry(
> new GridExtent(null, new long[]{0, -64800}, new
> long[]{172799,21599}, true),
> PixelInCell.CELL_CENTER, gridToCrs, crs);
> AffineTransform2D gridToCrs2 = new AffineTransform2D(
> 0.001373291015625, 0,
> 0, -0.001373291015625,
> -179.99931335449220,
> 89.99931335449219);
> GridGeometry tileGrid = new GridGeometry(new GridExtent(256, 256),
> PixelInCell.CELL_CENTER, gridToCrs2, crs);
> GridGeometry intersection = tilingScheme.derive()
> .subgrid(tileGrid).build();
> System.out.println(tilingScheme);
> System.out.println(tileGrid);
> System.out.println(intersection);
> }
> {code}
> This issue has been reported by Johann.
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