Fix a bug with geotiff writing when yaxis is flipped

Unidata · May 9, 2024 · 6f5afea · 6f5afea
1 parent 12d0b71
commit 6f5afea
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Showing 3 changed files with 6 additions and 1 deletion.
diff --git a/cdm/misc/src/main/java/ucar/nc2/geotiff/GeotiffWriter.java b/cdm/misc/src/main/java/ucar/nc2/geotiff/GeotiffWriter.java
@@ -558,7 +558,7 @@ public void writeGrid(GeoReferencedArray array, boolean greyScale) throws IOExce
     Array data = array.getData().reduce();
     if (yaxis.getCoordMidpoint(0) < yaxis.getCoordMidpoint(1)) {
       data = data.flip(0);
-      yStart = yaxis.getCoordEdgeLast();
+      yStart = yaxis.getCoordEdgeLast() * scaler;
     }
 
     /*

diff --git a/cdm/misc/src/test/data/ucar/nc2/geotiff/categorical.nc b/cdm/misc/src/test/data/ucar/nc2/geotiff/categorical.nc
diff --git a/cdm/misc/src/test/java/ucar/nc2/geotiff/TestGeoTiffWriter.java b/cdm/misc/src/test/java/ucar/nc2/geotiff/TestGeoTiffWriter.java
@@ -64,6 +64,11 @@ public static List<Object[]> getTestParameters() {
 
       result.add(new Object[] {TestDir.cdmUnitTestDir + "ft/coverage/testCFwriter.nc", FeatureType.GRID, "Temperature",
           greyscale == 1});
+
+      // This file is unique in that it is lambert conformal with yaxis flipped.
+      result.add(new Object[] {"src/test/data/ucar/nc2/geotiff/categorical.nc", FeatureType.GRID, "drought",
+          greyscale == 1});
+
     }
 
     return result;