From e3f54649d5273311de28404f2c84dad53dc01e36 Mon Sep 17 00:00:00 2001
From: Daniel Baston <dbaston@gmail.com>
Date: Sat, 14 Sep 2024 17:24:19 -0400
Subject: [PATCH] GDALCreateApproxTransformer: Clarify dfMaxError description
 in docstring

[ci skip]
---
 alg/gdaltransformer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/alg/gdaltransformer.cpp b/alg/gdaltransformer.cpp
index 256a79ed6b8b..3eda4c75b31c 100644
--- a/alg/gdaltransformer.cpp
+++ b/alg/gdaltransformer.cpp
@@ -3828,7 +3828,8 @@ static CPLXMLNode *GDALSerializeApproxTransformer(void *pTransformArg)
  * @param pBaseTransformArg the callback argument for the high precision
  * transformer.
  * @param dfMaxError the maximum cartesian error in the "output" space that
- * is to be accepted in the linear approximation.
+ * is to be accepted in the linear approximation, evaluated as a Manhattan
+ * distance.
  *
  * @return callback pointer suitable for use with GDALApproxTransform().  It
  * should be deallocated with GDALDestroyApproxTransformer().