diff --git a/include/usgscsm/UsgsAstroPlugin.h b/include/usgscsm/UsgsAstroPlugin.h
index 0ab4f6cc6b8c6873d933b3566423566a9bc7b363..3536875b04c6ea25bb83e378bcba6e1ae50f9501 100644
--- a/include/usgscsm/UsgsAstroPlugin.h
+++ b/include/usgscsm/UsgsAstroPlugin.h
@@ -59,6 +59,7 @@ private:
 
     typedef csm::Model* (*sensorConstructor)(void);
     static std::map<std::string, sensorConstructor> MODELS;
+    std::shared_ptr<spdlog::logger> m_logger;
 };
 
 #endif
diff --git a/include/usgscsm/UsgsAstroSarSensorModel.h b/include/usgscsm/UsgsAstroSarSensorModel.h
index 98f436ac892671ab75c2641a16d8c52ded7f6cf4..17e27db6ea2f81731648ede905b021ae4b8df9a9 100644
--- a/include/usgscsm/UsgsAstroSarSensorModel.h
+++ b/include/usgscsm/UsgsAstroSarSensorModel.h
@@ -5,6 +5,8 @@
 #include <SettableEllipsoid.h>
 #include <CorrelationModel.h>
 
+#include "spdlog/spdlog.h"
+
 class UsgsAstroSarSensorModel : public csm::RasterGM, virtual public csm::SettableEllipsoid
 {
 
@@ -23,9 +25,9 @@ class UsgsAstroSarSensorModel : public csm::RasterGM, virtual public csm::Settab
 
     virtual std::string getModelState() const;
 
-    static std::string constructStateFromIsd(const std::string imageSupportData, csm::WarningList *list);
+    std::string constructStateFromIsd(const std::string imageSupportData, csm::WarningList *list);
 
-    static std::string getModelNameFromModelState(const std::string& model_state);
+    std::string getModelNameFromModelState(const std::string& model_state);
 
     virtual csm::ImageCoord groundToImage(
         const csm::EcefCoord& groundPt,
@@ -264,6 +266,8 @@ class UsgsAstroSarSensorModel : public csm::RasterGM, virtual public csm::Settab
     std::vector<double> m_sunVelocity;
     double m_wavelength;
     LookDirection m_lookDirection;
+    
+    std::shared_ptr<spdlog::logger> m_logger = spdlog::get("usgscsm_logger");
 };
 
 #endif
diff --git a/src/UsgsAstroFrameSensorModel.cpp b/src/UsgsAstroFrameSensorModel.cpp
index dce4c645f84aecab3cd5de155892f5be64f3a6bf..ca49a6b7d188b9b3477153f2200e10c8dae02284 100644
--- a/src/UsgsAstroFrameSensorModel.cpp
+++ b/src/UsgsAstroFrameSensorModel.cpp
@@ -31,10 +31,12 @@ const std::string UsgsAstroFrameSensorModel::m_parameterName[] = {
 };
 
 UsgsAstroFrameSensorModel::UsgsAstroFrameSensorModel() {
-    reset();
+  MESSAGE_LOG("Creating UsgsAstroFrameSensorModel");
+  reset();
 }
 
 void UsgsAstroFrameSensorModel::reset() {
+  MESSAGE_LOG("Resetting UsgsAstroFrameSensorModel");
     m_modelName = _SENSOR_MODEL_NAME;
     m_platformName = "";
     m_sensorName = "";
@@ -161,6 +163,10 @@ csm::ImageCoord UsgsAstroFrameSensorModel::groundToImage(
     &m_iTransS[0], &m_iTransL[0],
     line, sample);
 
+
+  MESSAGE_LOG("Computed groundToImage for {}, {}, {} as line, sample: {}, {}",
+              groundPt.x, groundPt.y, groundPt.z, line, sample);
+
   return csm::ImageCoord(line, sample);
 }
 
@@ -169,7 +175,7 @@ csm::ImageCoordCovar UsgsAstroFrameSensorModel::groundToImage(const csm::EcefCoo
                                    double desiredPrecision,
                                    double *achievedPrecision,
                                    csm::WarningList *warnings) const {
-    MESSAGE_LOG("Computeing groundToImage(Covar) for {}, {}, {}, with desired precision {}",
+    MESSAGE_LOG("Computing groundToImage(Covar) for {}, {}, {}, with desired precision {}",
                 groundPt.x, groundPt.y, groundPt.z, desiredPrecision);
 
     csm::EcefCoord gp;
@@ -182,6 +188,8 @@ csm::ImageCoordCovar UsgsAstroFrameSensorModel::groundToImage(const csm::EcefCoo
    csm::ImageCoordCovar result(ip.line, ip.samp);
    // This is a partial, incorrect implementation to test if SocetGXP needs
    // this method implemented in order to load the sensor.
+    MESSAGE_LOG("Computed groundToImage(Covar) for {}, {}, {}, as line, sample: {}, {}",
+                groundPt.x, groundPt.y, groundPt.z, ip.line, ip.samp);
    return result;
 }
 
@@ -242,6 +250,8 @@ csm::EcefCoord UsgsAstroFrameSensorModel::imageToGround(const csm::ImageCoord &i
   double x, y, z;
   losEllipsoidIntersect(height, xc, yc, zc, xl, yl, zl, x, y, z);
 
+  MESSAGE_LOG("Resulting EcefCoordinate: {}, {}, {}", x, y, z);
+
   return csm::EcefCoord(x, y, z);
 }
 
@@ -251,9 +261,12 @@ csm::EcefCoordCovar UsgsAstroFrameSensorModel::imageToGround(const csm::ImageCoo
                                   double *achievedPrecision,
                                   csm::WarningList *warnings) const {
 
-    MESSAGE_LOG("Computeing imageToGround(Covar) for {}, {}, {}, with desired precision {}",
+    MESSAGE_LOG("Computing imageToGround(Covar) for {}, {}, {}, with desired precision {}",
                 imagePt.line, imagePt.samp, height, desiredPrecision);
     // This is an incomplete implementation to see if SocetGXP needs this method implemented.
+
+    MESSAGE_LOG("This is an incomplete implementation to see if SocetGXP needs this method implemented"); 
+
     csm::EcefCoordCovar result;
     return result;
 }
@@ -265,7 +278,7 @@ csm::EcefLocus UsgsAstroFrameSensorModel::imageToProximateImagingLocus(const csm
                                                                 double *achievedPrecision,
                                                                 csm::WarningList *warnings) const {
   // Ignore the ground point?
-  MESSAGE_LOG("Computeing imageToProximateImagingLocus(No ground) for point {}, {}, {}, with desired precision {}",
+  MESSAGE_LOG("Computing imageToProximateImagingLocus(No ground) for point {}, {}, {}, with desired precision {}",
                                imagePt.line, imagePt.samp, desiredPrecision);
   return imageToRemoteImagingLocus(imagePt);
 }
@@ -275,7 +288,7 @@ csm::EcefLocus UsgsAstroFrameSensorModel::imageToRemoteImagingLocus(const csm::I
                                                              double desiredPrecision,
                                                              double *achievedPrecision,
                                                              csm::WarningList *warnings) const {
-  MESSAGE_LOG("Computeing imageToProximateImagingLocus for {}, {}, {}, with desired precision {}",
+  MESSAGE_LOG("Computing imageToProximateImagingLocus for {}, {}, {}, with desired precision {}",
                                imagePt.line, imagePt.samp, desiredPrecision);
   // Find the line,sample on the focal plane (mm)
   double focalPlaneX, focalPlaneY;
@@ -343,6 +356,8 @@ std::pair<csm::ImageCoord, csm::ImageCoord> UsgsAstroFrameSensorModel::getValidI
     MESSAGE_LOG("Accessing Image Range");
     csm::ImageCoord min_pt(m_startingDetectorLine, m_startingDetectorSample);
     csm::ImageCoord max_pt(m_nLines, m_nSamples);
+    MESSAGE_LOG("Valid image range: min {}, {} max: {}, {}", min_pt.samp, min_pt.line, 
+                max_pt.samp, max_pt.line)
     return std::pair<csm::ImageCoord, csm::ImageCoord>(min_pt, max_pt);
 }
 
@@ -391,6 +406,9 @@ csm::EcefCoord UsgsAstroFrameSensorModel::getSensorPosition(const csm::ImageCoor
     return sensorPosition;
   }
   else {
+    MESSAGE_LOG("ERROR: UsgsAstroFrameSensorModel::getSensorPosition: "
+                "Image Coordinate {},{} out of Bounds",
+                imagePt.line, imagePt.samp);
     throw csm::Error(csm::Error::BOUNDS,
                      "Image Coordinate out of Bounds",
                      "UsgsAstroFrameSensorModel::getSensorPosition");
@@ -408,6 +426,7 @@ csm::EcefCoord UsgsAstroFrameSensorModel::getSensorPosition(double time) const {
 
         return sensorPosition;
     } else {
+      MESSAGE_LOG("ERROR: UsgsAstroFrameSensorModel::getSensorPosition: Valid image time is 0.0");
         std::string aMessage = "Valid image time is 0.0";
         throw csm::Error(csm::Error::BOUNDS,
                          aMessage,
@@ -422,6 +441,7 @@ csm::EcefVector UsgsAstroFrameSensorModel::getSensorVelocity(const csm::ImageCoo
   // Make sure the passed coordinate is with the image dimensions.
   if (imagePt.samp < 0.0 || imagePt.samp > m_nSamples ||
       imagePt.line < 0.0 || imagePt.line > m_nLines) {
+    MESSAGE_LOG("ERROR: Image coordinate out of bounds.")
     throw csm::Error(csm::Error::BOUNDS, "Image coordinate out of bounds.",
                      "UsgsAstroFrameSensorModel::getSensorVelocity");
   }
@@ -548,7 +568,7 @@ std::vector<csm::RasterGM::SensorPartials> UsgsAstroFrameSensorModel::computeAll
                                           desiredPrecision, achievedPrecision, warnings);
   return computeAllSensorPartials(imagePt, groundPt,
                                   pset, desiredPrecision, achievedPrecision, warnings);
-    }
+  }
 
 std::vector<double> UsgsAstroFrameSensorModel::computeGroundPartials(const csm::EcefCoord
                                                                      &groundPt) const {
@@ -643,19 +663,19 @@ void UsgsAstroFrameSensorModel::setImageIdentifier(const std::string& imageId,
 
 
 std::string UsgsAstroFrameSensorModel::getSensorIdentifier() const {
-  MESSAGE_LOG("Accessing sensor ID");
+  MESSAGE_LOG("Accessing sensor ID: {}", m_sensorName);
   return m_sensorName;
 }
 
 
 std::string UsgsAstroFrameSensorModel::getPlatformIdentifier() const {
-  MESSAGE_LOG("Accessing platform ID");
+  MESSAGE_LOG("Accessing platform ID: {}", m_platformName);
   return m_platformName;
 }
 
 
 std::string UsgsAstroFrameSensorModel::getCollectionIdentifier() const {
-  MESSAGE_LOG("Accessing collection ID");
+  MESSAGE_LOG("Accessing collection ID: {}", m_collectionIdentifier);
   return m_collectionIdentifier;
 }
 
@@ -782,9 +802,12 @@ bool UsgsAstroFrameSensorModel::isValidModelState(const std::string& stringState
   if (!missingKeywords.empty() && warnings) {
     std::ostringstream oss;
     std::copy(missingKeywords.begin(), missingKeywords.end(), std::ostream_iterator<std::string>(oss, " "));
+
+    MESSAGE_LOG("State has missing keywords: {} ", oss.str()); 
+
     warnings->push_back(csm::Warning(
       csm::Warning::DATA_NOT_AVAILABLE,
-      "State has missing keywrods: " + oss.str(),
+      "State has missing keywords: " + oss.str(),
       "UsgsAstroFrameSensorModel::isValidModelState"
     ));
   }
@@ -792,6 +815,9 @@ bool UsgsAstroFrameSensorModel::isValidModelState(const std::string& stringState
   std::string modelName = jsonState.value<std::string>("m_modelName", "");
 
   if (modelName != _SENSOR_MODEL_NAME && warnings) {
+    MESSAGE_LOG("Incorrect model name in state, expected {} but got {}",
+                _SENSOR_MODEL_NAME, modelName);
+ 
     warnings->push_back(csm::Warning(
       csm::Warning::DATA_NOT_AVAILABLE,
       "Incorrect model name in state, expected " + _SENSOR_MODEL_NAME + " but got " + modelName,
@@ -822,7 +848,7 @@ bool UsgsAstroFrameSensorModel::isValidIsd(const std::string& Isd, csm::WarningL
 void UsgsAstroFrameSensorModel::replaceModelState(const std::string& stringState) {
 
     json state = json::parse(stringState);
-    MESSAGE_LOG("Replaceing model state");
+    MESSAGE_LOG("Replacing model state");
     // The json library's .at() will except if key is missing
     try {
         m_modelName = state.at("m_modelName").get<std::string>();
@@ -856,6 +882,7 @@ void UsgsAstroFrameSensorModel::replaceModelState(const std::string& stringState
         m_currentParameterCovariance = state.at("m_currentParameterCovariance").get<std::vector<double>>();
     }
     catch(std::out_of_range& e) {
+      MESSAGE_LOG("State keywords required to generate sensor model missing: " + std::string(e.what()) + "\nUsing model string: " + stringState + "UsgsAstroFrameSensorModel::replaceModelState");
       throw csm::Error(csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE,
                        "State keywords required to generate sensor model missing: " + std::string(e.what()) + "\nUsing model string: " + stringState,
                        "UsgsAstroFrameSensorModel::replaceModelState");
@@ -913,6 +940,8 @@ std::string UsgsAstroFrameSensorModel::constructStateFromIsd(const std::string&
     }
 
     if (!positions.empty() && positions.size() != 3) {
+      MESSAGE_LOG("Sensor position does not have 3 values, "
+                  "UsgsAstroFrameSensorModel::constructStateFromIsd()");
       parsingWarnings->push_back(
         csm::Warning(
           csm::Warning::DATA_NOT_AVAILABLE,
@@ -928,6 +957,8 @@ std::string UsgsAstroFrameSensorModel::constructStateFromIsd(const std::string&
 
     // get sensor_velocity
     if (!velocities.empty() && velocities.size() != 3) {
+      MESSAGE_LOG("Sensor velocity does not have 3 values, "
+                  "UsgsAstroFrameSensorModel::constructStateFromIsd()");
       parsingWarnings->push_back(
         csm::Warning(
           csm::Warning::DATA_NOT_AVAILABLE,
@@ -975,6 +1006,8 @@ std::string UsgsAstroFrameSensorModel::constructStateFromIsd(const std::string&
     }
 
     if (quaternions.size() != 4) {
+      MESSAGE_LOG("Sensor quaternion does not have 4 values, "
+                  "UsgsAstroFrameSensorModel::constructStateFromIsd()");
       parsingWarnings->push_back(
         csm::Warning(
           csm::Warning::DATA_NOT_AVAILABLE,
@@ -1032,6 +1065,7 @@ std::string UsgsAstroFrameSensorModel::constructStateFromIsd(const std::string&
                                state["m_transY"][2].get<double>() * state["m_iTransS"][0].get<double>());
     }
     catch (...) {
+      MESSAGE_LOG("Could not compute detector pixel to focal plane coordinate transformation.");
       parsingWarnings->push_back(
         csm::Warning(
           csm::Warning::DATA_NOT_AVAILABLE,
@@ -1053,6 +1087,8 @@ std::string UsgsAstroFrameSensorModel::constructStateFromIsd(const std::string&
       }
       delete parsingWarnings;
       parsingWarnings = nullptr;
+      MESSAGE_LOG("ISD is invalid for creating the sensor model.");
+                  
       throw csm::Error(csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE,
                        "ISD is invalid for creating the sensor model.",
                        "UsgsAstroFrameSensorModel::constructStateFromIsd");
diff --git a/src/UsgsAstroPlugin.cpp b/src/UsgsAstroPlugin.cpp
index 7933d89f909130d22084df8ccf88192bab892be0..7b6b290cdc8000a67ac994b178a21869e7a64b75 100644
--- a/src/UsgsAstroPlugin.cpp
+++ b/src/UsgsAstroPlugin.cpp
@@ -25,6 +25,7 @@ using json = nlohmann::json;
 # define DIR_DELIMITER_STR  "/"
 #endif
 
+#define MESSAGE_LOG(...) if (m_logger) { m_logger->info(__VA_ARGS__); }
 
 // Declaration of static variables
 const std::string UsgsAstroPlugin::_PLUGIN_NAME = "UsgsAstroPluginCSM";
@@ -37,17 +38,17 @@ const UsgsAstroPlugin UsgsAstroPlugin::m_registeredPlugin;
 
 UsgsAstroPlugin::UsgsAstroPlugin() {
 
-  // Build and register the USGSCSM logger on pluggin creation
+  // Build and register the USGSCSM logger on plugin creation
   char * logFilePtr = getenv("ALE_LOG_FILE");
 
   if (logFilePtr != NULL) {
     std::string logFile(logFilePtr);
 
     if (logFile != "") {
-      std::shared_ptr<spdlog::logger> logger = spdlog::get("usgscsm_logger");
+      std::shared_ptr<spdlog::logger> m_logger = spdlog::get("usgscsm_logger");
 
-      if (!logger) {
-        std::shared_ptr<spdlog::logger> new_logger = spdlog::basic_logger_mt("usgscsm_logger", logFile);
+      if (!m_logger) {
+        std::shared_ptr<spdlog::logger> m_logger = spdlog::basic_logger_mt("usgscsm_logger", logFile);
       }
     }
   }
@@ -59,26 +60,31 @@ UsgsAstroPlugin::~UsgsAstroPlugin() {
 
 
 std::string UsgsAstroPlugin::getPluginName() const {
+  MESSAGE_LOG("Get Plugin Name: {}", _PLUGIN_NAME);
   return _PLUGIN_NAME;
 }
 
 
 std::string UsgsAstroPlugin::getManufacturer() const {
+  MESSAGE_LOG("Get Manufacturer Name: {}", _MANUFACTURER_NAME);
   return _MANUFACTURER_NAME;
 }
 
 
 std::string UsgsAstroPlugin::getReleaseDate() const {
+  MESSAGE_LOG("Get Release Date: {}", _RELEASE_DATE);
   return _RELEASE_DATE;
 }
 
 
 csm::Version UsgsAstroPlugin::getCsmVersion() const {
+  MESSAGE_LOG("Get Current CSM Version");
   return CURRENT_CSM_VERSION;
 }
 
 
 size_t UsgsAstroPlugin::getNumModels() const {
+  MESSAGE_LOG("Get Number of Sensor Models: {}", _N_SENSOR_MODELS);
   return _N_SENSOR_MODELS;
 }
 
@@ -89,16 +95,19 @@ std::string UsgsAstroPlugin::getModelName(size_t modelIndex) const {
     UsgsAstroLsSensorModel::_SENSOR_MODEL_NAME,
     UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME
   };
+  MESSAGE_LOG("Get Model Name: {}. Used index: {}", supportedModelNames[modelIndex], modelIndex);
   return supportedModelNames[modelIndex];
 }
 
 
 std::string UsgsAstroPlugin::getModelFamily(size_t modelIndex) const {
+  MESSAGE_LOG("Get Model Familey: {}", CSM_RASTER_FAMILY); 
   return CSM_RASTER_FAMILY;
 }
 
 
 csm::Version UsgsAstroPlugin::getModelVersion(const std::string &modelName) const {
+  MESSAGE_LOG("Get Model Version");
   return csm::Version(1, 0, 0);
 }
 
@@ -116,6 +125,7 @@ bool UsgsAstroPlugin::canModelBeConstructedFromState(const std::string &modelNam
     msg += "] with error [";
     msg += e.what();
     msg += "]";
+    MESSAGE_LOG(msg);
     if(warnings) {
       warnings->push_back(
         csm::Warning(
@@ -129,6 +139,7 @@ bool UsgsAstroPlugin::canModelBeConstructedFromState(const std::string &modelNam
     std::string msg = "Could not create model [";
     msg += modelName;
     msg += "] with an unknown error.";
+    MESSAGE_LOG(msg);
     if(warnings) {
       warnings->push_back(
         csm::Warning(
@@ -155,6 +166,7 @@ bool UsgsAstroPlugin::canModelBeConstructedFromISD(const csm::Isd &imageSupportD
       msg += "] with error [";
       msg += e.what();
       msg += "]";
+      MESSAGE_LOG(msg);
       warnings->push_back(
         csm::Warning(
           csm::Warning::UNKNOWN_WARNING,
@@ -167,6 +179,7 @@ bool UsgsAstroPlugin::canModelBeConstructedFromISD(const csm::Isd &imageSupportD
       std::string msg = "Could not create model [";
       msg += modelName;
       msg += "] with an unknown error.";
+      MESSAGE_LOG(msg);
       warnings->push_back(
         csm::Warning(
           csm::Warning::UNKNOWN_WARNING,
@@ -190,7 +203,8 @@ std::string UsgsAstroPlugin::loadImageSupportData(const csm::Isd &imageSupportDa
   lastIndex = baseName.find_last_of(DIR_DELIMITER_STR);
   std::string filename = baseName.substr(lastIndex + 1);
   std::string isdFilename = baseName.append(".json");
-
+  MESSAGE_LOG("Load Image Support Data using: {}, {}, {}, {}, {}", 
+              imageFilename, lastIndex, baseName, filename, isdFilename);
   try {
     std::ifstream isd_sidecar(isdFilename);
     json jsonisd;
@@ -205,6 +219,7 @@ std::string UsgsAstroPlugin::loadImageSupportData(const csm::Isd &imageSupportDa
     errorMessage += "] with error [";
     errorMessage += e.what();
     errorMessage += "]";
+    MESSAGE_LOG(errorMessage);
     throw csm::Error(csm::Error::FILE_READ, errorMessage,
                      "UsgsAstroPlugin::loadImageSupportData");
   }
@@ -216,11 +231,12 @@ std::string UsgsAstroPlugin::getModelNameFromModelState(const std::string &model
   auto state = json::parse(modelState);
 
   std::string name = state.value<std::string>("name_model", "");
-
+  MESSAGE_LOG("Get model name from model state. State: {}, Name: {}", modelState, name);
   if (name == "") {
       csm::Error::ErrorType aErrorType = csm::Error::INVALID_SENSOR_MODEL_STATE;
       std::string aMessage = "No 'name_model' key in the model state object.";
       std::string aFunction = "UsgsAstroPlugin::getModelNameFromModelState";
+      MESSAGE_LOG(aMessage);
       csm::Error csmErr(aErrorType, aMessage, aFunction);
       throw(csmErr);
   }
@@ -232,6 +248,7 @@ std::string UsgsAstroPlugin::getModelNameFromModelState(const std::string &model
 bool UsgsAstroPlugin::canISDBeConvertedToModelState(const csm::Isd &imageSupportData,
                                                const std::string &modelName,
                                                csm::WarningList *warnings) const {
+  MESSAGE_LOG("Running canISDBeConvertedToModelState");
   try {
        convertISDToModelState(imageSupportData, modelName, warnings);
   }
@@ -242,6 +259,7 @@ bool UsgsAstroPlugin::canISDBeConvertedToModelState(const csm::Isd &imageSupport
       msg += "] state with error [";
       msg += e.what();
       msg += "]";
+      MESSAGE_LOG(msg);
       warnings->push_back(
         csm::Warning(
           csm::Warning::UNKNOWN_WARNING,
@@ -255,16 +273,18 @@ bool UsgsAstroPlugin::canISDBeConvertedToModelState(const csm::Isd &imageSupport
 
 
 std::string UsgsAstroPlugin::getStateFromISD(csm::Isd imageSupportData) const {
-    std::string stringIsd = loadImageSupportData(imageSupportData);
-    json jsonIsd = json::parse(stringIsd);
-    return convertISDToModelState(imageSupportData, jsonIsd.at("name_model"));
+  MESSAGE_LOG("Running getStateFromISD");
+  std::string stringIsd = loadImageSupportData(imageSupportData);
+  MESSAGE_LOG("ISD string: {}", stringIsd);
+  json jsonIsd = json::parse(stringIsd);
+  return convertISDToModelState(imageSupportData, jsonIsd.at("name_model"));
 }
 
 
 std::string UsgsAstroPlugin::convertISDToModelState(const csm::Isd &imageSupportData,
                                                const std::string &modelName,
                                                csm::WarningList *warnings) const {
-
+  MESSAGE_LOG("Running convertISDToModelState");
   csm::Model* sensor_model = constructModelFromISD(imageSupportData, modelName, warnings);
   return sensor_model->getModelState();
 }
@@ -273,97 +293,108 @@ std::string UsgsAstroPlugin::convertISDToModelState(const csm::Isd &imageSupport
 csm::Model *UsgsAstroPlugin::constructModelFromISD(const csm::Isd &imageSupportDataOriginal,
                                               const std::string &modelName,
                                               csm::WarningList *warnings) const {
-    std::string stringIsd = loadImageSupportData(imageSupportDataOriginal);
-
-    if (modelName == UsgsAstroFrameSensorModel::_SENSOR_MODEL_NAME) {
-      UsgsAstroFrameSensorModel *model =  new UsgsAstroFrameSensorModel();
-      try {
-        model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
-        std::shared_ptr<spdlog::logger> logger = model->getLogger();
-        if (logger) {
-          logger->info("Constructed model: {}", modelName);
-        }
-      }
-      catch (std::exception& e) {
-        csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
-        std::string aMessage = "Could not construct model [";
-        aMessage += modelName;
-        aMessage += "] with error [";
-        aMessage += e.what();
-        aMessage += "]";
-        std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
-        throw csm::Error(aErrorType, aMessage, aFunction);
-      }
-      return model;
+  MESSAGE_LOG("Running constructModelFromISD");
+  std::string stringIsd = loadImageSupportData(imageSupportDataOriginal);
+  
+  MESSAGE_LOG("ISD String: {}", stringIsd);
+  if (modelName == UsgsAstroFrameSensorModel::_SENSOR_MODEL_NAME) {
+    UsgsAstroFrameSensorModel *model =  new UsgsAstroFrameSensorModel();
+    try {
+      MESSAGE_LOG("Trying to construct a UsgsAstroFrameSensorModel");
+      model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
+      MESSAGE_LOG("Constructed model: {}", modelName);
     }
-    else if (modelName == UsgsAstroLsSensorModel::_SENSOR_MODEL_NAME) {
-      UsgsAstroLsSensorModel *model =  new UsgsAstroLsSensorModel();
-      try {
-        model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
-      }
-      catch (std::exception& e) {
-        csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
-        std::string aMessage = "Could not construct model [";
-        aMessage += modelName;
-        aMessage += "] with error [";
-        aMessage += e.what();
-        aMessage += "]";
-        std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
-        throw csm::Error(aErrorType, aMessage, aFunction);
-      }
-      return model;
+    catch (std::exception& e) {
+      csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
+      std::string aMessage = "Could not construct model [";
+      aMessage += modelName;
+      aMessage += "] with error [";
+      aMessage += e.what();
+      aMessage += "]";
+      MESSAGE_LOG(aMessage);
+      std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
+      throw csm::Error(aErrorType, aMessage, aFunction);
     }
-    else if (modelName == UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME) {
-      UsgsAstroSarSensorModel *model =  new UsgsAstroSarSensorModel();
-      try {
-        model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
-      }
-      catch (std::exception& e) {
-        csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
-        std::string aMessage = "Could not construct model [";
-        aMessage += modelName;
-        aMessage += "] with error [";
-        aMessage += e.what();
-        aMessage += "]";
-        std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
-        throw csm::Error(aErrorType, aMessage, aFunction);
-      }
-      return model;
+    return model;
+  }
+  else if (modelName == UsgsAstroLsSensorModel::_SENSOR_MODEL_NAME) {
+    UsgsAstroLsSensorModel *model =  new UsgsAstroLsSensorModel();
+    try {
+      MESSAGE_LOG("Trying to construct a UsgsAstroLsSensorModel");
+      model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
+    }
+    catch (std::exception& e) {
+      csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
+      std::string aMessage = "Could not construct model [";
+      aMessage += modelName;
+      aMessage += "] with error [";
+      aMessage += e.what();
+      aMessage += "]";
+      std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
+      MESSAGE_LOG(aMessage);
+      throw csm::Error(aErrorType, aMessage, aFunction);
     }
-    else {
-      csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_SUPPORTED;
-      std::string aMessage = "Model [" + modelName + "] not supported: ";
+    return model;
+  }
+  else if (modelName == UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME) {
+    UsgsAstroSarSensorModel *model =  new UsgsAstroSarSensorModel();
+    MESSAGE_LOG("Trying to construct a UsgsAstroSarSensorModel");
+    try {
+      model->replaceModelState(model->constructStateFromIsd(stringIsd, warnings));
+    }
+    catch (std::exception& e) {
+      csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE;
+      std::string aMessage = "Could not construct model [";
+      aMessage += modelName;
+      aMessage += "] with error [";
+      aMessage += e.what();
+      aMessage += "]";
       std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
+      MESSAGE_LOG(aMessage);
       throw csm::Error(aErrorType, aMessage, aFunction);
     }
+    return model;
+  }
+  else {
+    csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_SUPPORTED;
+    std::string aMessage = "Model [" + modelName + "] not supported: ";
+    std::string aFunction = "UsgsAstroPlugin::constructModelFromISD()";
+    MESSAGE_LOG(aMessage);
+    throw csm::Error(aErrorType, aMessage, aFunction);
+  }
 }
 
 
 csm::Model *UsgsAstroPlugin::constructModelFromState(const std::string& modelState,
                                                 csm::WarningList *warnings) const {
-
-    json state = json::parse(modelState);
-    std::string modelName = state["m_modelName"];
-
-    if (modelName == UsgsAstroFrameSensorModel::_SENSOR_MODEL_NAME) {
-         UsgsAstroFrameSensorModel* model = new UsgsAstroFrameSensorModel();
-         model->replaceModelState(modelState);
-         return model;
-    }
-    else if (modelName == UsgsAstroLsSensorModel::_SENSOR_MODEL_NAME) {
-        UsgsAstroLsSensorModel* model = new UsgsAstroLsSensorModel();
-        model->replaceModelState(modelState);
-        return model;
-    }
-    else if (modelName == UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME) {
-        UsgsAstroSarSensorModel* model = new UsgsAstroSarSensorModel();
-        model->replaceModelState(modelState);
-        return model;
-    }
-    else {
-      csm::Error::ErrorType aErrorType = csm::Error::ISD_NOT_SUPPORTED;
-      std::string aMessage = "Model" + modelName + " not supported: ";
-      std::string aFunction = "UsgsAstroPlugin::constructModelFromState()";
-      throw csm::Error(aErrorType, aMessage, aFunction);
-    }
+  MESSAGE_LOG("Runing constructModelFromState with modelState: {}", modelState);
+  json state = json::parse(modelState);
+  std::string modelName = state["m_modelName"];
+  MESSAGE_LOG("Using model name: {}", modelName);
+
+  if (modelName == UsgsAstroFrameSensorModel::_SENSOR_MODEL_NAME) {
+    MESSAGE_LOG("Constructing a UsgsAstroFrameSensorModel");
+    UsgsAstroFrameSensorModel* model = new UsgsAstroFrameSensorModel();
+    model->replaceModelState(modelState);
+    return model;
+  }
+  else if (modelName == UsgsAstroLsSensorModel::_SENSOR_MODEL_NAME) {
+    MESSAGE_LOG("Constructing a UsgsAstroLsSensorModel");
+    UsgsAstroLsSensorModel* model = new UsgsAstroLsSensorModel();
+    model->replaceModelState(modelState);
+    return model;
+  }
+  else if (modelName == UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME) {
+    MESSAGE_LOG("Constructing a UsgsAstroSarSensorModel");
+    UsgsAstroSarSensorModel* model = new UsgsAstroSarSensorModel();
+    model->replaceModelState(modelState);
+    return model;
+  }
+  else {
+    csm::Error::ErrorType aErrorType = csm::Error::ISD_NOT_SUPPORTED;
+    std::string aMessage = "Model" + modelName + " not supported: ";
+    std::string aFunction = "UsgsAstroPlugin::constructModelFromState()";
+    MESSAGE_LOG(aMessage);
+    throw csm::Error(aErrorType, aMessage, aFunction);
+  }
 }
diff --git a/src/UsgsAstroSarSensorModel.cpp b/src/UsgsAstroSarSensorModel.cpp
index 87745417ea17ebc49e5c05b3356810c9152c5fd7..b1fff63392741bdf5a88c2b8012748c0602f0668 100644
--- a/src/UsgsAstroSarSensorModel.cpp
+++ b/src/UsgsAstroSarSensorModel.cpp
@@ -11,7 +11,7 @@
 using json = nlohmann::json;
 using namespace std;
 
-#define MESSAGE_LOG(logger, ...) if (logger) { logger->info(__VA_ARGS__); }
+#define MESSAGE_LOG(...) if (m_logger) { m_logger->info(__VA_ARGS__); }
 
 const string UsgsAstroSarSensorModel::_SENSOR_MODEL_NAME = "USGS_ASTRO_SAR_SENSOR_MODEL";
 const int UsgsAstroSarSensorModel::NUM_PARAMETERS = 6;
@@ -44,8 +44,9 @@ const csm::param::Type
 
 string UsgsAstroSarSensorModel::constructStateFromIsd(
     const string imageSupportData,
-    csm::WarningList *warnings)
-{
+    csm::WarningList *warnings){
+  
+  MESSAGE_LOG("UsgsAstroSarSensorModel constructing state from ISD, with {}", imageSupportData);
   json isd = json::parse(imageSupportData);
   json state = {};
 
@@ -76,10 +77,12 @@ string UsgsAstroSarSensorModel::constructStateFromIsd(
     state["m_dtEphem"] = isd.at("dt_ephemeris");
   }
   catch(...) {
+    std::string msg =  "dt_ephemeris not in ISD";
+    MESSAGE_LOG(msg);
     parsingWarnings->push_back(
       csm::Warning(
         csm::Warning::DATA_NOT_AVAILABLE,
-        "dt_ephemeris not in ISD",
+        msg,
         "UsgsAstroSarSensorModel::constructStateFromIsd()"));
   }
 
@@ -87,10 +90,12 @@ string UsgsAstroSarSensorModel::constructStateFromIsd(
     state["m_t0Ephem"] = isd.at("t0_ephemeris");
   }
   catch(...) {
+    std::string msg = "t0_ephemeris not in ISD";
+    MESSAGE_LOG(msg);
     parsingWarnings->push_back(
       csm::Warning(
         csm::Warning::DATA_NOT_AVAILABLE,
-        "t0_ephemeris not in ISD",
+        msg,
         "UsgsAstroSarSensorModel::constructStateFromIsd()"));
   }
 
@@ -135,6 +140,7 @@ string UsgsAstroSarSensorModel::constructStateFromIsd(
     message += "]";
     parsingWarnings = nullptr;
     delete parsingWarnings;
+    MESSAGE_LOG(message);
     throw csm::Error(csm::Error::SENSOR_MODEL_NOT_CONSTRUCTIBLE,
                      message,
                      "UsgsAstroSarSensorModel::constructStateFromIsd");
@@ -148,40 +154,41 @@ string UsgsAstroSarSensorModel::constructStateFromIsd(
   return state.dump();
 }
 
-string UsgsAstroSarSensorModel::getModelNameFromModelState(const string& model_state)
-{
-   // Parse the string to JSON
-   auto j = json::parse(model_state);
-   // If model name cannot be determined, return a blank string
-   string model_name;
-
-   if (j.find("m_modelName") != j.end()) {
-       model_name = j["m_modelName"];
-   } else {
-       csm::Error::ErrorType aErrorType = csm::Error::INVALID_SENSOR_MODEL_STATE;
-       string aMessage = "No 'm_modelName' key in the model state object.";
-       string aFunction = "UsgsAstroSarSensorModel::getModelNameFromModelState";
-       csm::Error csmErr(aErrorType, aMessage, aFunction);
-       throw(csmErr);
-   }
-   if (model_name != _SENSOR_MODEL_NAME){
-       csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_SUPPORTED;
-       string aMessage = "Sensor model not supported.";
-       string aFunction = "UsgsAstroSarSensorModel::getModelNameFromModelState()";
-       csm::Error csmErr(aErrorType, aMessage, aFunction);
-       throw(csmErr);
-   }
-   return model_name;
-
-}
-
-UsgsAstroSarSensorModel::UsgsAstroSarSensorModel()
-{
+string UsgsAstroSarSensorModel::getModelNameFromModelState(const string& model_state) {
+  MESSAGE_LOG("Getting model name from model state: {}", model_state);
+  // Parse the string to JSON
+  auto j = json::parse(model_state);
+  // If model name cannot be determined, return a blank string
+  string model_name;
+
+  if (j.find("m_modelName") != j.end()) {
+    model_name = j["m_modelName"];
+  } else {
+    csm::Error::ErrorType aErrorType = csm::Error::INVALID_SENSOR_MODEL_STATE;
+    string aMessage = "No 'm_modelName' key in the model state object.";
+    string aFunction = "UsgsAstroSarSensorModel::getModelNameFromModelState";
+    MESSAGE_LOG(aMessage);
+    csm::Error csmErr(aErrorType, aMessage, aFunction);
+    throw(csmErr);
+  }
+  if (model_name != _SENSOR_MODEL_NAME){
+    csm::Error::ErrorType aErrorType = csm::Error::SENSOR_MODEL_NOT_SUPPORTED;
+    string aMessage = "Sensor model not supported.";
+    string aFunction = "UsgsAstroSarSensorModel::getModelNameFromModelState()";
+    MESSAGE_LOG(aMessage);
+    csm::Error csmErr(aErrorType, aMessage, aFunction);
+    throw(csmErr);
+  }
+  return model_name;
+}
+
+UsgsAstroSarSensorModel::UsgsAstroSarSensorModel() {
+  MESSAGE_LOG("Constructing UsgsAstroSarSensorModel");
   reset();
 }
 
-void UsgsAstroSarSensorModel::reset()
-{
+void UsgsAstroSarSensorModel::reset() {
+  MESSAGE_LOG("Resetting UsgsAstroSarSensorModel");
   m_imageIdentifier = "Unknown";
   m_sensorName = "Unknown";
   m_platformIdentifier = "Unknown";
@@ -218,10 +225,10 @@ void UsgsAstroSarSensorModel::reset()
   m_wavelength = 0;
 }
 
-void UsgsAstroSarSensorModel::replaceModelState(const string& argState)
-{
+void UsgsAstroSarSensorModel::replaceModelState(const string& argState){
   reset();
-
+  
+  MESSAGE_LOG("Replacing model state with: {}", argState);
   auto stateJson = json::parse(argState);
 
   m_imageIdentifier = stateJson["m_imageIdentifier"].get<string>();
@@ -240,6 +247,7 @@ void UsgsAstroSarSensorModel::replaceModelState(const string& argState)
   }
   else {
     std::string message = "Could not determine look direction from state";
+    MESSAGE_LOG(message);
     throw csm::Error(csm::Error::INVALID_SENSOR_MODEL_STATE,
                      message,
                      "UsgsAstroSarSensorModel::replaceModelState");
@@ -269,8 +277,7 @@ void UsgsAstroSarSensorModel::replaceModelState(const string& argState)
   m_sunVelocity = stateJson["m_sunVelocity"].get<vector<double>>();
 }
 
-string UsgsAstroSarSensorModel::getModelState() const
-{
+string UsgsAstroSarSensorModel::getModelState() const {
   json state = {};
 
   state["m_modelName"] = _SENSOR_MODEL_NAME;
@@ -310,6 +317,7 @@ string UsgsAstroSarSensorModel::getModelState() const
   }
   else {
     std::string message = "Could not parse look direction from json state.";
+    MESSAGE_LOG(message);
     throw csm::Error(csm::Error::INVALID_SENSOR_MODEL_STATE,
                      message,
                      "UsgsAstroSarSensorModel::getModelState");
@@ -329,8 +337,8 @@ csm::ImageCoord UsgsAstroSarSensorModel::groundToImage(
     double* achievedPrecision,
     csm::WarningList* warnings) const {
 
-  //MESSAGE_LOG(this->m_logger, "Computing groundToImage(ImageCoord) for {}, {}, {}, with desired precision {}",
-  //          groundPt.x, groundPt.y, groundPt.z, desiredPrecision);
+  MESSAGE_LOG("Computing groundToImage(ImageCoord) for {}, {}, {}, with desired precision {}",
+            groundPt.x, groundPt.y, groundPt.z, desiredPrecision);
 
   // Find time of closest approach to groundPt and the corresponding slant range by finding
   // the root of the doppler shift frequency
@@ -351,6 +359,7 @@ csm::ImageCoord UsgsAstroSarSensorModel::groundToImage(
     std::string message = "Could not calculate groundToImage, with error [";
     message += error.what();
     message += "]";
+    MESSAGE_LOG(message);
     throw csm::Error(csm::Error::UNKNOWN_ERROR, message, "groundToImage");
   }
 }
@@ -358,19 +367,20 @@ csm::ImageCoord UsgsAstroSarSensorModel::groundToImage(
 // Calculate the root
 double UsgsAstroSarSensorModel::dopplerShift(
     csm::EcefCoord groundPt,
-    double tolerance) const
-{
-   csm::EcefVector groundVec(groundPt.x ,groundPt.y, groundPt.z);
-   std::function<double(double)> dopplerShiftFunction = [this, groundVec](double time) {
-     csm::EcefVector spacecraftPosition = getSpacecraftPosition(time);
-     csm::EcefVector spacecraftVelocity = getSensorVelocity(time);
-     csm::EcefVector lookVector = spacecraftPosition - groundVec;
-
-     double slantRange = norm(lookVector);
-
-     double dopplerShift = -2.0 * dot(lookVector, spacecraftVelocity) / (slantRange * m_wavelength);
-
-     return dopplerShift;
+    double tolerance) const {
+  MESSAGE_LOG("Calculating doppler shift with: {}, {}, {}, and tolerance {}.", 
+              groundPt.x, groundPt.y, groundPt.z, tolerance);
+  csm::EcefVector groundVec(groundPt.x ,groundPt.y, groundPt.z);
+  std::function<double(double)> dopplerShiftFunction = [this, groundVec](double time) {
+    csm::EcefVector spacecraftPosition = getSpacecraftPosition(time);
+    csm::EcefVector spacecraftVelocity = getSensorVelocity(time);
+    csm::EcefVector lookVector = spacecraftPosition - groundVec;
+    
+    double slantRange = norm(lookVector);
+    
+    double dopplerShift = -2.0 * dot(lookVector, spacecraftVelocity) / (slantRange * m_wavelength);
+    
+    return dopplerShift;
    };
 
   // Do root-finding for "dopplerShift"
@@ -379,8 +389,9 @@ double UsgsAstroSarSensorModel::dopplerShift(
 
 
 double UsgsAstroSarSensorModel::slantRange(csm::EcefCoord surfPt,
-    double time) const
-{
+    double time) const {
+  MESSAGE_LOG("Calculating slant range with: {}, {}, {}, and time {}.", 
+              surfPt.x, surfPt.y, surfPt.z, time);
   csm::EcefVector surfVec(surfPt.x ,surfPt.y, surfPt.z);
   csm::EcefVector spacecraftPosition = getSpacecraftPosition(time);
   return norm(spacecraftPosition - surfVec);
@@ -390,8 +401,10 @@ double UsgsAstroSarSensorModel::slantRangeToGroundRange(
     const csm::EcefCoord& groundPt,
     double time,
     double slantRange,
-    double tolerance) const
-{
+    double tolerance) const {
+  MESSAGE_LOG("Calculating slant range to ground range with: {}, {}, {}, {}, {}, {}",
+              groundPt.x, groundPt.y, groundPt.z, time, slantRange, tolerance);
+
   std::vector<double> coeffs = getRangeCoefficients(time);
 
   // Calculates the ground range from the slant range.
@@ -415,8 +428,7 @@ double UsgsAstroSarSensorModel::slantRangeToGroundRange(
   return brentRoot(minGroundRangeGuess, maxGroundRangeGuess, slantRangeToGroundRangeFunction, tolerance);
 }
 
-double UsgsAstroSarSensorModel::groundRangeToSlantRange(double groundRange, const std::vector<double> &coeffs) const
-{
+double UsgsAstroSarSensorModel::groundRangeToSlantRange(double groundRange, const std::vector<double> &coeffs) const {
   return coeffs[0] + groundRange * (coeffs[1] + groundRange * (coeffs[2] + groundRange * coeffs[3]));
 }
 
@@ -425,8 +437,9 @@ csm::ImageCoordCovar UsgsAstroSarSensorModel::groundToImage(
     const csm::EcefCoordCovar& groundPt,
     double desiredPrecision,
     double* achievedPrecision,
-    csm::WarningList* warnings) const
-{
+    csm::WarningList* warnings) const {
+  MESSAGE_LOG("Calculating groundToImage with: {}, {}, {}, {}", groundPt.x, groundPt.y, groundPt.z,
+              desiredPrecision);
   // Ground to image with error propagation
   // Compute corresponding image point
   csm::EcefCoord gp(groundPt);
@@ -489,8 +502,9 @@ csm::EcefCoord UsgsAstroSarSensorModel::imageToGround(
     double height,
     double desiredPrecision,
     double* achievedPrecision,
-    csm::WarningList* warnings) const
-{
+    csm::WarningList* warnings) const {
+  MESSAGE_LOG("Calculating imageToGround with: {}, {}, {}, {}", imagePt.samp, imagePt.line, height,
+              desiredPrecision);
   double time = m_startingEphemerisTime + (imagePt.line - 0.5) * m_exposureDuration;
   double groundRange = imagePt.samp * m_scaledPixelWidth;
   std::vector<double> coeffs = getRangeCoefficients(time);
@@ -544,8 +558,9 @@ csm::EcefCoordCovar UsgsAstroSarSensorModel::imageToGround(
     double heightVariance,
     double desiredPrecision,
     double* achievedPrecision,
-    csm::WarningList* warnings) const
-{
+    csm::WarningList* warnings) const {
+  MESSAGE_LOG("Calculating imageToGroundWith: {}, {}, {}, {}, {}", imagePt.samp, imagePt.line, 
+              height, heightVariance, desiredPrecision);
   // Image to ground with error propagation
   // Use numerical partials
   const double DELTA_IMAGE = 1.0;
@@ -624,8 +639,7 @@ csm::EcefLocus UsgsAstroSarSensorModel::imageToProximateImagingLocus(
     const csm::EcefCoord& groundPt,
     double desiredPrecision,
     double* achievedPrecision,
-    csm::WarningList* warnings) const
-{
+    csm::WarningList* warnings) const {
   // Compute the slant range
   double time = m_startingEphemerisTime + (imagePt.line - 0.5) * m_exposureDuration;
   double groundRange = imagePt.samp * m_scaledPixelWidth;
diff --git a/tests/SarTests.cpp b/tests/SarTests.cpp
index 60a859c9d4ec85d1491c169d7e3bfa00038bc050..9180650e691e034b959f3b0442ef2e6a93feb365 100644
--- a/tests/SarTests.cpp
+++ b/tests/SarTests.cpp
@@ -15,7 +15,7 @@
 
 using json = nlohmann::json;
 
-TEST(SarTests, stateFromIsd) {
+TEST_F(SarSensorModel, stateFromIsd) {
   std::ifstream isdFile("data/orbitalSar.json");
   json isdJson;
   isdFile >> isdJson;
@@ -23,7 +23,7 @@ TEST(SarTests, stateFromIsd) {
   csm::WarningList warnings;
   std::string stateString;
   try {
-    stateString = UsgsAstroSarSensorModel::constructStateFromIsd(isdString, &warnings);
+    stateString = sensorModel->constructStateFromIsd(isdString, &warnings);
   }
   catch(...) {
     for (auto &warn: warnings) {