diff --git a/snap-core/src/main/java/org/esa/snap/core/dataio/geocoding/GeoCodingFactory.java b/snap-core/src/main/java/org/esa/snap/core/dataio/geocoding/GeoCodingFactory.java
index 6dcb61ce95a..aa522a0249d 100644
--- a/snap-core/src/main/java/org/esa/snap/core/dataio/geocoding/GeoCodingFactory.java
+++ b/snap-core/src/main/java/org/esa/snap/core/dataio/geocoding/GeoCodingFactory.java
@@ -150,7 +150,7 @@ static double estimateGroundResolutionInKm(double[] latitudes, double[] longitud
         final double[] measures = new double[3];
         // upper left, measure in y direction
         EllipsoidDistance distance = new EllipsoidDistance(longitudes[0], latitudes[0], DefaultEllipsoid.WGS84);
-        measures[0] = distance.distance(longitudes[width], latitudes[width]);
+        measures[0] = distance.distance(longitudes[width], latitudes[height]);
 
         // center, measuring in x direction
         final int yOff = height / 2;