--- a/src/Grids/mapped_grid.jl	Thu Apr 25 08:59:45 2024 +0200
+++ b/src/Grids/mapped_grid.jl	Thu Apr 25 09:03:35 2024 +0200
@@ -60,3 +60,22 @@
         map(J,lg),
     )
 end
+
+function jacobian_determinant(g::MappedGrid)
+    return map(jacobian(g)) do ∂x∂ξ
+        det(∂x∂ξ)
+    end
+end
+
+function geometric_tensor(g::MappedGrid)
+    return map(jacobian(g)) do ∂x∂ξ
+        ∂x∂ξ'*∂x∂ξ
+    end
+end
+
+function geometric_tensor_inverse(g::MappedGrid)
+    return map(jacobian(g)) do ∂x∂ξ
+        inv(∂x∂ξ'*∂x∂ξ)
+    end
+end
+