优化更新代码，添加界面功能并整合

ShrlAlgo.RvKits/RvIndependent/MetroGauges/LandXMLData/Metric.cs

@@ -0,0 +1,26 @@
+using System.Xml.Serialization;
+
+namespace ShrlAlgo.RvKits.RvIndependent.MetroGauges.LandXMLData
+{
+    [XmlType("Metric")]
+    [Serializable]
+    public class Metric : Unit
+    {
+        public Metric()
+        {
+            Initialize();
+        }
+
+        public override void Initialize()
+        {
+            _directionUnit = LandXMLData.DirectionUnit.decimal_degrees;
+            _angularUnit = LandXMLData.DirectionUnit.decimal_degrees;
+            DiameterUnit = DiameterUnit.meter;
+            PressureUnit = PressureUnit.inchHG;
+            TemperatureUnit = TemperatureUnit.celsius;
+            AreaUnit = AreaUnit.squareMeter;
+            VolumeUnit = VolumeUnit.cubicMeter;
+            LinearUnit = LinearUnit.meter;
+        }
+    }
+}