Merge pull request #1152 from xcube-dev/konstntokas-xxx-add_reprojection

Add reprojection

Author: forman

CHANGES.md

@@ -15,6 +15,33 @@
 * Pinned `tornado >=6.0,<6.5` due to an incompatibility with current 
   xcube server implementation.
 
+### Enhancements
+
+* Introduced a more efficient and robust approach for dataset reprojection:
+  
+  * **New method:** Added `xcube.core.resampling.reproject_dataset`, a high-performance 
+    alternative to `xcube.core.resampling.resample_in_space` for reprojecting datasets
+    to different coordinate reference systems (CRS).
+
+  * **Recommended usage:** Ideal for reprojection between regular grids. It improves 
+   computational efficiency and simplifies the reprojection process.
+   It is not addressing _rectification_ from irregular to regular grids (e.g., Sentinel-3).
+
+  * **Validation:** The notebook `examples/notebook/resampling/reproject_esa_cci_landcover_new_method.ipynb`
+    shows that `reproject_dataset` and `resample_in_space` produce nearly identical
+    results when reprojecting to a different CRS, with only negligible differences.
+
+  * **Backward compatibility:** `resample_in_space` remains available to preserve
+    compatibility with existing services. Once `reproject_dataset` proves stable in 
+    production use, it may be integrated into `resample_in_space`.
+
+  * **Technical context:** `resample_in_space` currently uses either affine transforms 
+    or the [Spatial Rectification Algorithm](https://xcube.readthedocs.io/en/latest/rectify.html#spatial-rectification-algorithm),
+    which is specialized for non-regular 2D grids (e.g., Sentinel-3). While applicable 
+    to regular grid reprojection, the algorithm is unnecessarily complex for such cases.
+
+
+
 ## Changes in 1.9.1 
 
 ### Enhancements

examples/notebooks/resampling/reproject_large_esa_cci_landcover.ipynb renamed to examples/notebooks/resampling/reproject_esa_cci_landcover.ipynb

@@ -4467,7 +4467,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.12.7"
+   "version": "3.13.2"
   }
  },
  "nbformat": 4,