Eov magassági korrekció rácshálóból (gtx)

lib/pages/map/presentation/controllers/map_controller.dart

@@ -21,6 +21,7 @@ import 'package:permission_handler/permission_handler.dart'
     as permission_handler;
 import 'package:share_plus/share_plus.dart';
 import 'package:supabase_flutter/supabase_flutter.dart';
+import 'package:terepi_seged/controls/geoid_grid.dart';
 import 'package:terepi_seged/eov/convert_coordinate.dart';
 import 'package:terepi_seged/eov/eov.dart';
 import 'package:terepi_seged/gnss_sentences/gngga.dart';
@@ -78,6 +79,8 @@ class MapViewController extends GetxController {
   RxDouble gpsAltitudeError = 0.0.obs;
   Rx<DateTime> gpsDateTime = DateTime(2000).obs;
   Rx<Eov> eov = Eov(0, 0).obs;
+  Rx<double?> eovHeight = 0.0.obs;
+
   RxInt latDegree = 0.obs;
   RxInt latMin = 0.obs;
   RxDouble latSec = 0.0.obs;
@@ -99,6 +102,8 @@ class MapViewController extends GetxController {
   RxInt pointsToMeasureSelectedValue = (-1).obs;
   RxDouble distance = 0.0.obs;
 
+  late GeoidGrid geoidGrid;
+
   TextEditingController pointIdController = TextEditingController();
   TextEditingController pointDescriptionController = TextEditingController();
   TextEditingController gpsHeightController = TextEditingController();
@@ -180,6 +185,8 @@ class MapViewController extends GetxController {
             })
         .subscribe();
 
+    geoidGrid = await GeoidGrid.load('assets/Grids/geoid_eht2014.gtx');
+
     mapController = MapController();
 
     // riveGpsIconController = RiveUtils.getRiveController(Artboard(),
@@ -482,6 +489,11 @@ class MapViewController extends GetxController {
               gpsQuality.value = sentence.gpsQualityIndicator;
               eov.value = ConvertCoordinate.ConvertWgsToEov(
                   gpsLatitude.value, gpsLongitude.value);
+              eovHeight.value = geoidGrid?.toEovHeight(
+                  gpsLatitude.value,
+                  gpsLongitude.value,
+                  gpsAltitude.value,
+                  gpsGeoidSeparation.value);
 
               if (pointsToMeasureSelectedValue.value >= 0) {
                 double coordX =