diff --git a/src/UsgsAstroLsSensorModel.cpp b/src/UsgsAstroLsSensorModel.cpp index 6177b347abef538ec8c1ba298f4f3601656cf3b2..85e06be485c423ad46601db1beb4114eb6e1f370 100644 --- a/src/UsgsAstroLsSensorModel.cpp +++ b/src/UsgsAstroLsSensorModel.cpp @@ -2514,7 +2514,7 @@ void UsgsAstroLsSensorModel::setLinearApproximation() double height, aPrec; double desired_precision = 0.01; computeElevation(refPt.x, refPt.y, refPt.z, height, aPrec, desired_precision); - if (isnan(height)) + if (std::isnan(height)) { MESSAGE_LOG(m_logger, "setLinearApproximation: computeElevation of" "reference point {} {} {} with desired precision"