[SEDONA-336] Add RS_UpperLeftX and RS_UpperLeftY

common/src/main/java/org/apache/sedona/common/raster/RasterAccessors.java

@@ -63,6 +63,15 @@ public static int getHeight(GridCoverage2D raster) {
         return raster.getGridGeometry().getGridRange().getSpan(1);
     }
 
+    public static double getUpperLeftX(GridCoverage2D raster) {
+        Envelope2D envelope2D = raster.getEnvelope2D();
+        return envelope2D.getMinX();
+    }
+
+    public static double getUpperLeftY(GridCoverage2D raster) {
+        Envelope2D envelope2D = raster.getEnvelope2D();
+        return envelope2D.getMaxY();
+    }
 
     public static double getScaleX(GridCoverage2D raster) {
         return getAffineTransform(raster).getScaleX();
@@ -81,7 +90,6 @@ private static AffineTransform2D getAffineTransform(GridCoverage2D raster) throw
         return (AffineTransform2D) crsTransform;
     }
 
-
     public static Geometry envelope(GridCoverage2D raster) throws FactoryException {
         Envelope2D envelope2D = raster.getEnvelope2D();
 

common/src/test/java/org/apache/sedona/common/raster/RasterAccessorsTest.java

@@ -56,6 +56,28 @@ public void testSrid() throws FactoryException {
         assertEquals(4326, RasterAccessors.srid(multiBandRaster));
     }
 
+    @Test
+    public void testUpperLeftX() throws FactoryException {
+        GridCoverage2D gridCoverage2D = RasterConstructors.makeEmptyRaster(1, 3, 4, 1,2, 5);
+        double upperLeftX = RasterAccessors.getUpperLeftX(gridCoverage2D);
+        assertEquals(1, upperLeftX, 0.1d);
+
+        gridCoverage2D = RasterConstructors.makeEmptyRaster(10, 7, 8, 5, 6, 9);
+        upperLeftX = RasterAccessors.getUpperLeftX(gridCoverage2D);
+        assertEquals(5, upperLeftX, 0.1d);
+    }
+
+    @Test
+    public void testUpperLeftY() throws FactoryException {
+        GridCoverage2D gridCoverage2D = RasterConstructors.makeEmptyRaster(1, 3, 4, 1,2, 5);
+        double upperLeftY = RasterAccessors.getUpperLeftY(gridCoverage2D);
+        assertEquals(2, upperLeftY, 0.1d);
+
+        gridCoverage2D = RasterConstructors.makeEmptyRaster(10, 7, 8, 5, 6, 9);
+        upperLeftY = RasterAccessors.getUpperLeftY(gridCoverage2D);
+        assertEquals(6, upperLeftY, 0.1d);    
+    }
+
     @Test
     public void testScaleX() throws UnsupportedOperationException, FactoryException {
         GridCoverage2D emptyRaster = RasterConstructors.makeEmptyRaster(2, 10, 15, 0, 0, 1, 2, 0, 0, 0);

docs/api/sql/Raster-operators.md

@@ -64,6 +64,46 @@ Output:
 -2
 ```
 
+### RS_UpperLeftX
+
+Introduction: Returns the X coordinate of the upper-left corner of the raster.
+
+Format: `RS_UpperLeftX(raster: Raster)`
+
+Since: `v1.5.0`
+
+Spark SQL Example:
+
+```sql
+SELECT RS_UpperLeftX(raster) FROM rasters
+```
+
+Output:
+
+```
+5
+```
+
+### RS_UpperLeftY
+
+Introduction: Returns the Y coordinate of the upper-left corner of the raster.
+
+Format: `RS_UpperLeftY(raster: Raster)`
+
+Since: `v1.5.0`
+
+Spark SQL Example:
+
+```sql
+SELECT RS_UpperLeftY(raster) FROM rasters
+```
+
+Output:
+
+```
+6
+```
+
 ### RS_Width
 
 Introduction: Returns the width of the raster.

sql/common/src/main/scala/org/apache/sedona/sql/UDF/Catalog.scala

@@ -206,6 +206,8 @@ object Catalog {
     function[RS_AsArcGrid](),
     function[RS_Width](),
     function[RS_Height](),
+    function[RS_UpperLeftX](),
+    function[RS_UpperLeftY](),
     function[RS_ScaleX](),
     function[RS_ScaleY]()
   )

sql/common/src/main/scala/org/apache/spark/sql/sedona_sql/expressions/raster/RasterAccessors.scala

@@ -53,6 +53,18 @@ case class RS_Width(inputExpressions: Seq[Expression]) extends InferredExpressio
   }
 }
 
+case class RS_UpperLeftX(inputExpressions: Seq[Expression]) extends InferredExpression(RasterAccessors.getUpperLeftX _) {
+  protected def withNewChildrenInternal(newChildren: IndexedSeq[Expression]) = {
+    copy(inputExpressions = newChildren)
+  }
+}
+
+case class RS_UpperLeftY(inputExpressions: Seq[Expression]) extends InferredExpression(RasterAccessors.getUpperLeftY _) {
+  protected def withNewChildrenInternal(newChildren: IndexedSeq[Expression]) = {
+    copy(inputExpressions = newChildren)
+  }
+}
+
 case class RS_Height(inputExpressions: Seq[Expression]) extends InferredExpression(RasterAccessors.getHeight _) {
   protected def withNewChildrenInternal(newChildren: IndexedSeq[Expression]) = {
     copy(inputExpressions = newChildren)

sql/common/src/test/scala/org/apache/sedona/sql/rasteralgebraTest.scala

@@ -403,6 +403,20 @@ class rasteralgebraTest extends TestBaseScala with BeforeAndAfter with GivenWhen
       assertEquals(rasterDf.count(), binaryDf.count())
     }
 
+    it("Passed RS_UpperLeftX"){
+      val df = sparkSession.read.format("binaryFile").load(resourceFolder + "raster/test1.tiff")
+      val result = df.selectExpr("RS_UpperLeftX(RS_FromGeoTiff(content))").first().getDouble(0)
+      val expected: Double = -1.3095817809482181E7
+      assertEquals(expected, result, 1e-12)
+    }
+
+    it("Passed RS_UpperLeftY") {
+      val df = sparkSession.read.format("binaryFile").load(resourceFolder + "raster/test1.tiff")
+      val result = df.selectExpr("RS_UpperLeftY(RS_FromGeoTiff(content))").first().getDouble(0)
+      val expected: Double = 4021262.7487925636
+      assertEquals(expected, result, 1e-8)
+    }
+
     it("Passed RS_Metadata") {
       val df = sparkSession.read.format("binaryFile").load(resourceFolder + "raster/test1.tiff")
       val result = df.selectExpr("RS_Metadata(RS_FromGeoTiff(content))").first().getSeq(0)