UI presents altitude in EGM2008.

src/main/java/de/dennisguse/opentracks/content/TrackDataHub.java

@@ -27,9 +27,11 @@ import android.util.Log;
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 
+import java.io.IOException;
 import java.util.Collections;
 import java.util.Set;
 
+import de.dennisguse.opentracks.content.data.Altitude;
 import de.dennisguse.opentracks.content.data.Distance;
 import de.dennisguse.opentracks.content.data.Marker;
 import de.dennisguse.opentracks.content.data.MarkerColumns;
@@ -41,6 +43,7 @@ import de.dennisguse.opentracks.content.provider.ContentProviderUtils;
 import de.dennisguse.opentracks.content.provider.TrackPointIterator;
 import de.dennisguse.opentracks.services.TrackRecordingService;
 import de.dennisguse.opentracks.stats.TrackStatisticsUpdater;
+import de.dennisguse.opentracks.util.EGM2008Utils;
 
 /**
  * Track data hub.
@@ -72,6 +75,8 @@ public class TrackDataHub {
     private final ContentProviderUtils contentProviderUtils;
     private final int targetNumPoints;
 
+    private EGM2008Utils.EGM2008Correction egm2008Correction;
+
     private boolean started;
     private HandlerThread handlerThread;
     private Handler handler;
@@ -364,6 +369,8 @@ public class TrackDataHub {
                     break;
                 }
 
+                correctAltitude(trackPoint);
+
                 if (localFirstSeenTrackPointId == null) {
                     localFirstSeenTrackPointId = trackPointId;
                 }
@@ -407,6 +414,24 @@ public class TrackDataHub {
         }
     }
 
+    private void correctAltitude(TrackPoint trackPoint) {
+        if (!trackPoint.hasLocation() || !trackPoint.hasAltitude()) {
+            Log.d(TAG, "No altitude correction necessary.");
+            return;
+        }
+
+        if (egm2008Correction == null || !egm2008Correction.canCorrect(trackPoint.getLocation())) {
+            try {
+                egm2008Correction = EGM2008Utils.createCorrection(context, trackPoint.getLocation());
+            } catch (IOException e) {
+                Log.e(TAG, "Could not load altitude correction for " + trackPoint, e);
+                return;
+            }
+        }
+
+        trackPoint.setAltitude(Altitude.EGM2008.of(egm2008Correction.correctAltitude(trackPoint.getLocation())));
+    }
+
     /**
      * Resets the track points sampling states.
      */