Calculate resolution correctly for rotated rasters

geotiffjs · Nov 8, 2023 · 1eefc5c · 1eefc5c
1 parent 07f9007
commit 1eefc5c
Showing 1 changed file with 14 additions and 5 deletions.
diff --git a/src/geotiffimage.js b/src/geotiffimage.js
@@ -860,11 +860,20 @@ class GeoTIFFImage {
       ];
     }
     if (modelTransformation) {
-      return [
-        modelTransformation[0],
-        -modelTransformation[5],
-        modelTransformation[10],
-      ];
+      if (modelTransformation[1] == 0 && modelTransformation[4] == 0) {
+        return [
+          modelTransformation[0],
+          -modelTransformation[5],
+          modelTransformation[10],
+        ];
+      } else {
+        return [
+          Math.sqrt(modelTransformation[0] * modelTransformation[0] +
+            modelTransformation[4] * modelTransformation[4]),
+          Math.sqrt(modelTransformation[1] * modelTransformation[1] +
+            modelTransformation[5] * modelTransformation[5]),
+          modelTransformation[10]];
+      }
     }
 
     if (referenceImage) {