CivilDocument civilDocument = CivilDocument.GetCivilDocument(dwgDB);
_AngularUnits = civilDocument.Settings.DrawingSettings.UnitZoneSettings.AngularUnits.ToString();
_DrawingUnits = civilDocument.Settings.DrawingSettings.UnitZoneSettings.DrawingUnits.ToString();
// This property will be "InternationalFoot" even if it is displayed as "US Survey Foot" in the interface.
_ImperialToMetricConversion = civilDocument.Settings.DrawingSettings.UnitZoneSettings.ImperialToMetricConversion.ToString();