[sis] 02/02: Avoid an exception when the `gridToCRS` is unspecified in a "cloud optimized GeoTIFF" file.

[desruisseaux]

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desruisseaux pushed a commit to branch geoapi-4.0
in repository https://gitbox.apache.org/repos/asf/sis.git

commit 57164cfbe3618094361614ea09c51bfa2ab14833
Author: Martin Desruisseaux <martin.desruisse...@geomatys.com>
AuthorDate: Mon Apr 25 16:32:21 2022 +0200

    Avoid an exception when the `gridToCRS` is unspecified in a "cloud 
optimized GeoTIFF" file.
---
 .../org/apache/sis/storage/geotiff/MultiResolutionImage.java  | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git 
a/storage/sis-geotiff/src/main/java/org/apache/sis/storage/geotiff/MultiResolutionImage.java
 
b/storage/sis-geotiff/src/main/java/org/apache/sis/storage/geotiff/MultiResolutionImage.java
index 81c04c6c83..8ca1b4d1ba 100644
--- 
a/storage/sis-geotiff/src/main/java/org/apache/sis/storage/geotiff/MultiResolutionImage.java
+++ 
b/storage/sis-geotiff/src/main/java/org/apache/sis/storage/geotiff/MultiResolutionImage.java
@@ -146,14 +146,19 @@ final class MultiResolutionImage extends 
GridResourceWrapper {
             final GridGeometry       geometry   = base.getGridGeometry();
             final GridExtent         fullExtent = geometry.getExtent();
             final GridExtent         subExtent  = image.getExtent();
-            final MatrixSIS          gridToCRS  = 
MatrixSIS.castOrCopy(geometry.getGridToCRS(PixelInCell.CELL_CENTER)
-                    .derivative(new 
DirectPositionView.Double(fullExtent.getPointOfInterest())));
             final double[] scales = new double[fullExtent.getDimension()];
             for (int i=0; i<scales.length; i++) {
                 scales[i] = fullExtent.getSize(i, false) / 
subExtent.getSize(i, false);
             }
             image.initReducedResolution(base, scales);
-            resolution = gridToCRS.multiply(scales);
+            if (geometry.isDefined(GridGeometry.GRID_TO_CRS)) {
+                final MatrixSIS gridToCRS = 
MatrixSIS.castOrCopy(geometry.getGridToCRS(PixelInCell.CELL_CENTER)
+                                  .derivative(new 
DirectPositionView.Double(fullExtent.getPointOfInterest())));
+                resolution = gridToCRS.multiply(scales);
+            } else {
+                // Assume an identity transform for the `gridToCRS` of full 
resolution image.
+                resolution = scales;
+            }
             for (int i=0; i<resolution.length; i++) {
                 resolution[i] = Math.abs(resolution[i]);
             }