diff --git a/src/translations/Dyt_zh_CN.ts b/src/translations/Dyt_zh_CN.ts
index e6954a86..d28efc6e 100644
--- a/src/translations/Dyt_zh_CN.ts
+++ b/src/translations/Dyt_zh_CN.ts
@@ -1270,18 +1270,18 @@
 <context>
     <name>QtOsgViewWidget</name>
     <message>
-        <location filename="../viewer/QtOsgViewWidget.cpp" line="369"/>
-        <location filename="../viewer/QtOsgViewWidget.cpp" line="377"/>
+        <location filename="../viewer/QtOsgViewWidget.cpp" line="131"/>
+        <location filename="../viewer/QtOsgViewWidget.cpp" line="139"/>
         <source>warning</source>
         <translation type="unfinished">警告</translation>
     </message>
     <message>
-        <location filename="../viewer/QtOsgViewWidget.cpp" line="369"/>
+        <location filename="../viewer/QtOsgViewWidget.cpp" line="131"/>
         <source>default workspace failed</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <location filename="../viewer/QtOsgViewWidget.cpp" line="377"/>
+        <location filename="../viewer/QtOsgViewWidget.cpp" line="139"/>
         <source>open dyt file failed</source>
         <translation type="unfinished"></translation>
     </message>
diff --git a/src/viewer/QtOsgViewWidget.cpp b/src/viewer/QtOsgViewWidget.cpp
index afd9caad..a57a24a0 100644
--- a/src/viewer/QtOsgViewWidget.cpp
+++ b/src/viewer/QtOsgViewWidget.cpp
@@ -33,142 +33,6 @@
 #include "ui/MainFrame.h"
 
 
-double normalizeScaleMeters(double meters) {
-    if (meters <= 3) {
-        meters = 1;
-    } else if (meters <= 7.5) {
-        meters = 5;
-    } else if (meters <= 15) {
-        meters = 10;
-    } else if (meters <= 35) {
-        meters = 20;
-    } else if (meters <= 75) {
-        meters = 50;
-    } else if (meters <= 150) {
-        meters = 100;
-    } else if (meters <= 350) {
-        meters = 200;
-    } else if (meters <= 750) {
-        meters = 500;
-    } else if (meters <= 1500) {
-        meters = 1000;
-    } else if (meters <= 3500) {
-        meters = 2000;
-    } else if (meters <= 7500) {
-        meters = 5000;
-    } else if (meters <= 15000) {
-        meters = 10000;
-    } else if (meters <= 35000) {
-        meters = 20000;
-    } else if (meters <= 55000) {
-        meters = 50000;
-    } else if (meters <= 150000) {
-        meters = 100000;
-    } else if (meters <= 350000) {
-        meters = 200000;
-    } else if (meters <= 750000) {
-        meters = 500000;
-    } else if (meters <= 1500000) {
-        meters = 1000000;
-    } else {
-        meters = 2000000;
-    }
-    return meters;
-}
-
-double normalizeScaleFeet(double feet) {
-    double feetPerMile = 5280.0;
-    if (feet <= 7.5) {
-        feet = 5;
-    } else if (feet <= 15) {
-        feet = 10;
-    } else if (feet <= 35) {
-        feet = 20;
-    } else if (feet <= 75) {
-        feet = 50;
-    } else if (feet <= 150) {
-        feet = 100;
-    } else if (feet <= 350) {
-        feet = 200;
-    } else if (feet <= 750) {
-        feet = 500;
-    } else if (feet <= 1500) {
-        feet = 1000;
-    } else if (feet <= 3640) {
-        feet = 2000;
-    } else if (feet <= 1.5 * feetPerMile) {
-        feet = 1 * feetPerMile;
-    } else if (feet <= 3.5 * feetPerMile) {
-        feet = 2 * feetPerMile;
-    } else if (feet <= 7.5 * feetPerMile) {
-        feet = 5 * feetPerMile;
-    } else if (feet <= 15 * feetPerMile) {
-        feet = 10 * feetPerMile;
-    } else if (feet <= 35 * feetPerMile) {
-        feet = 20 * feetPerMile;
-    } else if (feet <= 75 * feetPerMile) {
-        feet = 50 * feetPerMile;
-    } else if (feet <= 150 * feetPerMile) {
-        feet = 100 * feetPerMile;
-    } else if (feet <= 350 * feetPerMile) {
-        feet = 200 * feetPerMile;
-    } else if (feet <= 750 * feetPerMile) {
-        feet = 500 * feetPerMile;
-    } else if (feet <= 1500 * feetPerMile) {
-        feet = 1000 * feetPerMile;
-    } else {
-        feet = 2000 * feetPerMile;
-    }
-    return feet;
-}
-
-double normalizeScaleNauticalMiles(double nmi) {
-    //double feetPerMile = 6076.12;
-    if (nmi <= 0.0015) {
-        nmi = 0.001;
-    } else if (nmi <= 0.0035) {
-        nmi = 0.002;
-    } else if (nmi <= 0.0075) {
-        nmi = 0.005;
-    } else if (nmi <= 0.015) {
-        nmi = 0.01;
-    } else if (nmi <= 0.035) {
-        nmi = 0.02;
-    } else if (nmi <= 0.075) {
-        nmi = 0.05;
-    } else if (nmi <= 0.15) {
-        nmi = 0.1;
-    } else if (nmi <= 0.35) {
-        nmi = 0.2;
-    } else if (nmi <= 0.75) {
-        nmi = 0.5;
-    } else if (nmi <= 1.5) {
-        nmi = 1;
-    } else if (nmi <= 3.5) {
-        nmi = 2;
-    } else if (nmi <= 7.5) {
-        nmi = 5;
-    } else if (nmi <= 15) {
-        nmi = 10;
-    } else if (nmi <= 35) {
-        nmi = 20;
-    } else if (nmi <= 75) {
-        nmi = 50;
-    } else if (nmi <= 150) {
-        nmi = 100;
-    } else if (nmi <= 350) {
-        nmi = 200;
-    } else if (nmi <= 750) {
-        nmi = 500;
-    } else if (nmi <= 1500) {
-        nmi = 1000;
-    } else {
-        nmi = 2000;
-    }
-    return nmi;
-}
-
-
 QtOsgViewWidget::QtOsgViewWidget(QWidget* parent)
     : QWidget(parent) {
     LOG_INFO("actor, self={}", fmt::ptr(this));
@@ -196,108 +60,6 @@ void QtOsgViewWidget::keyReleaseEvent(QKeyEvent* event) {
     view_->KeyRelease(event);
 }
 
-void QtOsgViewWidget::OnComputeScale() {
-    osgEarth::MapNode* mapNode = activeScene_->GetMapNode();
-    if (nullptr == mapNode || nullptr == mapNode->getTerrain()) {
-        return;
-    }
-    dyt_check(nullptr != view_);
-
-    float x = 0.0f, y = 0.0f;
-    osg::Vec3d world1, world2;
-    if (!mapNode->getTerrain()->getWorldCoordsUnderMouse(view_->GetView(), x, y, world1)) {
-        emit signalScaleInfo("");
-        return;
-    }
-    x += devicePixelRatio_;
-    if (!mapNode->getTerrain()->getWorldCoordsUnderMouse(view_->GetView(), x, y, world2)) {
-        emit signalScaleInfo("");
-        return;
-    }
-
-#if 0
-    TRACE("w1: %g %g %g w2: %g %g %g",
-        world1.x(), world1.y(), world1.z(),
-        world2.x(), world2.y(), world2.z());
-#endif
-
-    double meters;
-    double radius = 6378137.0;
-    dyt_check(nullptr != g_srs_);
-    radius = g_srs_->getEllipsoid().getRadiusEquator();
-
-    if (!g_srs_->isGeocentric() ) {
-        //        TRACE("Map is geographic");
-        // World cords are already lat/long
-        // Compute great circle distance
-        meters = osgEarth::GeoMath::distance(world1, world2, g_srs_);
-    } else {
-        osgEarth::GeoPoint mapPoint1, mapPoint2;
-        mapPoint1.fromWorld(g_srs_, world1);
-        mapPoint1.makeGeographic();
-        mapPoint2.fromWorld(g_srs_, world2);
-        mapPoint2.makeGeographic();
-        // Compute great circle distance
-        meters = osgEarth::GeoMath::distance(osg::DegreesToRadians(mapPoint1.y()),
-            osg::DegreesToRadians(mapPoint1.x()),
-            osg::DegreesToRadians(mapPoint2.y()),
-            osg::DegreesToRadians(mapPoint2.x()),
-            radius);
-    }
-
-    double scale = meters / devicePixelRatio_;
-    double pixelWidth = devicePixelRatio_ * 2.0;
-    // 1mi = 5280 feet
-    //double scaleMiles = scale / 1609.344; // International mile = 1609.344m
-    //double scaleNauticalMiles = scale / 1852.0; // nautical mile = 1852m
-    //double scaleUSSurveyMiles = scale / 1609.347218694; // US survey mile = 5280 US survey feet
-    //double scaleUSSurveyFeet = scale * 3937.0/1200.0; // US survey foot = 1200/3937 m
-#if 0
-    TRACE("m: %g px: %g m/px: %g", meters, pixelWidth, scale);
-#endif
-    switch (scaleUnits_) {
-    case ScaleBarHandler::Delegate::Units::UNITS_NAUTICAL_MILES: {
-        double nmi = meters / 1852.0;
-        scale = nmi / devicePixelRatio_;
-        nmi = normalizeScaleNauticalMiles(nmi);
-        pixelWidth = nmi / scale;
-        emit signalScaleInfo(QString("%1 nmi").arg(nmi));
-    } break;
-    case ScaleBarHandler::Delegate::Units::UNITS_US_SURVEY_FEET: {
-        double feet = meters * 3937.0 / 1200.0;
-        scale = feet / pixelWidth;
-        feet = normalizeScaleFeet(feet);
-        pixelWidth = feet / scale;
-        if (feet >= 5280) {
-            emit signalScaleInfo(QString("%1 miUS").arg(feet / 5280.0));
-        } else {
-            emit signalScaleInfo(QString("%1 ftUS").arg(feet));
-        }
-    } break;
-    case ScaleBarHandler::Delegate::Units::UNITS_INTL_FEET: {
-        double feet = 5280.0 * meters / 1609.344;
-        scale = feet / pixelWidth;
-        feet = normalizeScaleFeet(feet);
-        pixelWidth = feet / scale;
-        if (feet >= 5280) {
-            emit signalScaleInfo(QString("%1 mi").arg(feet / 5280.0));
-        } else {
-            emit signalScaleInfo(QString("%1 ft").arg(feet));
-        }
-    } break;
-    case ScaleBarHandler::Delegate::Units::UNITS_METERS:
-    default: {
-        meters = normalizeScaleMeters(meters);
-        pixelWidth = meters / scale;
-        if (meters >= 1000) {
-            emit signalScaleInfo(QString("%1 km").arg(meters * 0.001));
-        } else {
-            emit signalScaleInfo(QString("%1 m").arg(meters));
-        }
-    } break;
-    }
-}
-
 void QtOsgViewWidget::Initialize(void) {
     if (view_) {
         LOG_INFO("view is created");
diff --git a/src/viewer/QtOsgViewWidget.h b/src/viewer/QtOsgViewWidget.h
index 9c2031f6..583420f5 100644
--- a/src/viewer/QtOsgViewWidget.h
+++ b/src/viewer/QtOsgViewWidget.h
@@ -13,7 +13,7 @@ class QKeyEvent;
 class QInputEvent;
 class QResizeEvent;
 
-class QtOsgViewWidget : public QWidget, public ScaleBarHandler::Delegate {
+class QtOsgViewWidget : public QWidget {
     Q_OBJECT
 public:
     explicit QtOsgViewWidget(QWidget* parent = nullptr);
@@ -24,8 +24,6 @@ public:
         return nullptr;
     }
 
-    void OnComputeScale() override;
-
     void Initialize(void);
     void Uninitialize(void);