ReprojectRasterExtent: support single pixel input

#3559
locationtech · Jan 23, 2025 · 5a17e45 · 5a17e45
1 parent 7960ea1
commit 5a17e45
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Showing 2 changed files with 22 additions and 1 deletion.
diff --git a/raster/src/main/scala/geotrellis/raster/reproject/ReprojectRasterExtent.scala b/raster/src/main/scala/geotrellis/raster/reproject/ReprojectRasterExtent.scala
@@ -57,7 +57,19 @@ object ReprojectRasterExtent {
               val cols = ge.extent.width / ge.cellwidth
               val rows = ge.extent.height / ge.cellheight
               val pixelSize = distance / math.sqrt(cols * cols + rows * rows)
-              (pixelSize, pixelSize)
+              val pixelWidth =
+                if(newExtent.width <0.5*pixelSize) {
+                  newExtent.width
+                }else{
+                  pixelSize
+                }
+              val pixelHeight =
+                if(newExtent.height <0.5*pixelSize) {
+                  newExtent.height
+                }else{
+                  pixelSize
+                }
+              (pixelWidth, pixelHeight)
           }
 
         val newCols = (newExtent.width / pixelSizeX + 0.5).toLong

diff --git a/raster/src/test/scala/geotrellis/raster/reproject/ReprojectRasterExtentSpec.scala b/raster/src/test/scala/geotrellis/raster/reproject/ReprojectRasterExtentSpec.scala
@@ -109,5 +109,14 @@ class ReprojectRasterExtentSpec extends AnyFunSpec
       assert(destinationRE.extent covers region)
       assert(destinationRE.extent.toPolygon() intersects region)
     }
+
+    it("should reproject single pixel extents") {
+      val inputExtent = GridExtent[Long](Extent(429180.0, 7652390.0, 429190.0, 7652400.0), CellSize(10.0,10.0))
+      val destinationRE = ReprojectRasterExtent(inputExtent, CRS.fromEpsgCode(32639), LatLng)
+
+      assert(destinationRE.cols == 1)
+      assert(destinationRE.rows == 1)
+
+    }
   }
 }