diff --git a/TODO b/TODO
index 8478596..286adc6 100644
--- a/TODO
+++ b/TODO
@@ -12,7 +12,6 @@ Technology Preview 2 :
    => Add areas marking.
 - Improve terrain canvas editor.
    => Add GeoArea editor.
-   => Apply GeoArea to revertToTerrain.
    => Resample map on changing resolution.
    => Map loading should not choose arbitrary resolution.
 - Improve textures (current model is greatly incorrect).
diff --git a/gui_qt/baseformlayer.cpp b/gui_qt/baseformlayer.cpp
index 7cc98f6..7b7d9e8 100644
--- a/gui_qt/baseformlayer.cpp
+++ b/gui_qt/baseformlayer.cpp
@@ -28,6 +28,10 @@ void BaseFormLayer::applyConfig()
     BaseForm::applyConfig();
 }
 
+void BaseFormLayer::afterLayerAdded(void*)
+{
+}
+
 void BaseFormLayer::configChangeEvent()
 {
     layerApply(layersGetLayer(_layers_modified, currentLayer()));
@@ -57,7 +61,10 @@ void BaseFormLayer::layerAddedEvent()
         if (layer >= 0)
         {
             layersSetName(_layers_modified, layer, layer_name.toUtf8().data());
+            
             BaseForm::layerAddedEvent();
+            
+            afterLayerAdded(layersGetLayer(_layers_modified, layer));
         }
     }
 }
diff --git a/gui_qt/baseformlayer.h b/gui_qt/baseformlayer.h
index 8244b63..9d30536 100644
--- a/gui_qt/baseformlayer.h
+++ b/gui_qt/baseformlayer.h
@@ -21,6 +21,7 @@ public slots:
 protected:
     virtual void layerGetCopy(void* layer_definition) = 0;
     virtual void layerApply(void* layer_definition) = 0;
+    virtual void afterLayerAdded(void* layer_definition);
 
 private:
     virtual QStringList getLayers();
diff --git a/gui_qt/dialogheightmap.cpp b/gui_qt/dialogheightmap.cpp
index 2a732da..53a2c6d 100644
--- a/gui_qt/dialogheightmap.cpp
+++ b/gui_qt/dialogheightmap.cpp
@@ -241,27 +241,27 @@ void DialogHeightMap::changeResolution()
     result = QInputDialog::getItem(this, tr("Paysages 3D - Change heightmap resolution"), tr("Choose the new heightmap resolution. Beware that lowering the resolution may imply a loss of accuracy."), items, current, false);
     if (!result.isEmpty())
     {
-        int new_res_x, new_res_y;
+        int new_res_x, new_res_z;
         if (result == QString("64 x 64"))
         {
-            new_res_x = new_res_y = 64;
+            new_res_x = new_res_z = 64;
         }
         else if (result == QString("256 x 256"))
         {
-            new_res_x = new_res_y = 256;
+            new_res_x = new_res_z = 256;
         }
         else if (result == QString("512 x 512"))
         {
-            new_res_x = new_res_y = 512;
+            new_res_x = new_res_z = 512;
         }
         else
         {
-            new_res_x = new_res_y = 128;
+            new_res_x = new_res_z = 128;
         }
         
-        if (new_res_x != _value_modified.resolution_x or new_res_y != _value_modified.resolution_z)
+        if (new_res_x != _value_modified.resolution_x or new_res_z != _value_modified.resolution_z)
         {
-            heightmapChangeResolution(&_value_modified, 64, 64);
+            heightmapChangeResolution(&_value_modified, new_res_x, new_res_z);
             _3dview->revert();
             updateResolutionLabel();
         }
diff --git a/gui_qt/formterraincanvas.cpp b/gui_qt/formterraincanvas.cpp
index 3146604..757a6d2 100644
--- a/gui_qt/formterraincanvas.cpp
+++ b/gui_qt/formterraincanvas.cpp
@@ -72,3 +72,8 @@ void FormTerrainCanvas::layerApply(void* layer_definition)
 {
     terrainCanvasCopy(_definition, (TerrainCanvas*)layer_definition);
 }
+
+void FormTerrainCanvas::afterLayerAdded(void* layer_definition)
+{
+    terrainCanvasRevertToTerrain((TerrainCanvas*)layer_definition);
+}
diff --git a/gui_qt/formterraincanvas.h b/gui_qt/formterraincanvas.h
index bb372b2..f9f7915 100644
--- a/gui_qt/formterraincanvas.h
+++ b/gui_qt/formterraincanvas.h
@@ -17,6 +17,7 @@ public:
 protected:
     virtual void layerGetCopy(void* layer_definition);
     virtual void layerApply(void* layer_definition);
+    virtual void afterLayerAdded(void* layer_definition);
 
 private:
     TerrainCanvas* _definition;
diff --git a/lib_paysages/geoarea.c b/lib_paysages/geoarea.c
index 9571b05..af55ef2 100644
--- a/lib_paysages/geoarea.c
+++ b/lib_paysages/geoarea.c
@@ -51,3 +51,15 @@ void geoareaLoad(PackStream* stream, GeoArea* geoarea)
     packReadDouble(stream, &geoarea->size_x);
     packReadDouble(stream, &geoarea->size_z);
 }
+
+void geoareaToLocal(GeoArea* geoarea, double absolute_x, double absolute_z, double* local_x, double* local_z)
+{
+    *local_x = (absolute_x - geoarea->location_x) / geoarea->size_x;
+    *local_z = (absolute_z - geoarea->location_z) / geoarea->size_z;
+}
+
+void geoareaFromLocal(GeoArea* geoarea, double local_x, double local_z, double* absolute_x, double* absolute_z)
+{
+    *absolute_x = geoarea->location_x + local_x * geoarea->size_x;
+    *absolute_z = geoarea->location_z + local_z * geoarea->size_z;
+}
diff --git a/lib_paysages/geoarea.h b/lib_paysages/geoarea.h
index e18f1e2..19207b9 100644
--- a/lib_paysages/geoarea.h
+++ b/lib_paysages/geoarea.h
@@ -24,6 +24,9 @@ void geoareaValidate(GeoArea* geoarea);
 
 void geoareaSave(PackStream* stream, GeoArea* geoarea);
 void geoareaLoad(PackStream* stream, GeoArea* geoarea);
+
+void geoareaToLocal(GeoArea* geoarea, double absolute_x, double absolute_z, double* local_x, double* local_z);
+void geoareaFromLocal(GeoArea* geoarea, double local_x, double local_z, double* absolute_x, double* absolute_z);
     
 #ifdef __cplusplus
 }
diff --git a/lib_paysages/heightmap.c b/lib_paysages/heightmap.c
index adc16de..0957fb2 100644
--- a/lib_paysages/heightmap.c
+++ b/lib_paysages/heightmap.c
@@ -167,6 +167,7 @@ void heightmapRevertToTerrain(HeightMap* heightmap, TerrainDefinition* terrain,
 {
     int rx, rz;
     int x, z;
+    double dx, dz;
     
     rx = heightmap->resolution_x;
     rz = heightmap->resolution_z;
@@ -174,8 +175,10 @@ void heightmapRevertToTerrain(HeightMap* heightmap, TerrainDefinition* terrain,
     {
         for (z = 0; z < rz; z++)
         {
-            /* FIXME Apply geoarea */
-            heightmap->data[z * rx + x] = terrainGetHeight(terrain, 80.0 * (double)x / (double)(rx - 1) - 40.0, 80.0 * (double)z / (double)(rz - 1) - 40.0);
+            dx = (double)x / (double)(rx - 1);
+            dz = (double)z / (double)(rz - 1);
+            geoareaFromLocal(area, dx, dz, &dx, &dz);
+            heightmap->data[z * rx + x] = terrainGetHeight(terrain, dx, dz);
         }
     }
 }