From 29a64ea38a4bb1a420c132cf3eb6ee371a4b7275 Mon Sep 17 00:00:00 2001
From: Oleg Alexandrov <oleg.alexandrov@gmail.com>
Date: Tue, 14 May 2024 10:06:36 -0700
Subject: [PATCH] Use image center when computing flying height

---
 src/UsgsAstroLsSensorModel.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/UsgsAstroLsSensorModel.cpp b/src/UsgsAstroLsSensorModel.cpp
index 8d1d9857a..4a88aca7b 100644
--- a/src/UsgsAstroLsSensorModel.cpp
+++ b/src/UsgsAstroLsSensorModel.cpp
@@ -629,8 +629,10 @@ void UsgsAstroLsSensorModel::updateState() {
       "based on dx {} dy {} dz {}",
       m_gsd, dx, dy, dz)
 
-  // Compute flying height
-  csm::EcefCoord sensorPos = getSensorPosition(0.0);
+  // Compute the flying height. Use the center of the image, as for
+  // m_referencePointXyz and m_gsd.
+  ip = csm::ImageCoord(lineCtr, sampCtr);
+  csm::EcefCoord sensorPos = getSensorPosition(ip);
   dx = sensorPos.x - m_referencePointXyz.x;
   dy = sensorPos.y - m_referencePointXyz.y;
   dz = sensorPos.z - m_referencePointXyz.z;