The XY domain extent.
[Visual Basic .NET] Public Sub GetDomain ( _ ByRef XMin As Double, _ ByRef XMax As Double, _ ByRef YMin As Double, _ ByRef YMax As Double _ )
[C#] public void GetDomain ( ref double XMin, ref double XMax, ref double YMin, ref double YMax );
[C++]
HRESULT GetDomain(
double* XMin,
double* XMax,
double* YMin,
double* YMax
);
[C++]Parameters
XMin [out] XMin is a parameter of type double XMax [out] XMax is a parameter of type double YMin [out] YMin is a parameter of type double YMax [out] YMax is a parameter of type double
Product Availability
Description
An alternative method to the GetFalseOriginAndUnits method. Returns the minimum and maximum allowed X and Y values for a spatial reference. Use GetFalseOriginAndUnits to obtain the allowed precision (1/resolution) value.
Remarks
The GetDomain and SetDomain methods are used to set and get the square domain extent of a coordinate system. The domain extent is different than the valid area of a coordinate system. The domain extent is an arbitrary square used to delimit valid coordinates for a spatial reference system and determine their resolution. It is possible that the domain extent is larger than the usable area of a coordinate system (a UTM zone, for example). A small domain extent gives you finer resolution coordinates over a smaller area. A larger domain extent lets you represent features over a larger geographic area but with coarser resolution.
//This code example shows how to get the xy domain extent of a dataset.
private void GetSpatialReferenceProperties(IFeatureClass featureClass)
{
IGeoDataset geoDataset = featureClass as IGeoDataset;
//get access to SpatialReference through IGeoDataset
ISpatialReference spatialReference = geoDataset.SpatialReference;
//get the xy domain extent of the dataset
double xMin;
double xMax;
double yMin;
double yMax;
spatialReference.GetDomain(out xMin, out xMax, out yMin, out yMax);
System.Windows.Forms.MessageBox.Show(xMin + ", " + xMax + ", " + yMin + ", " + yMax);
}
'This code example shows how to get the xy domain extent of a dataset.
'This example assumes that a valid workspace object has already been established.
Sub GetDomain_Example(ByVal pWorkspace As IWorkspace)
Dim pFeatWS As IFeatureWorkspace
pFeatWS = pWorkspace
Dim pFeatDS As IFeatureDataset
pFeatDS = pFeatWS.OpenFeatureDataset("railroad")
Dim pGeoDataset As IGeoDataset
pGeoDataset = pFeatDS
'get access to SpatialReference through IGeoDataset
Dim pSpatRef As ISpatialReference
pSpatRef = pGeoDataset.SpatialReference
Dim dXmax As Double
Dim dYmax As Double
Dim dXmin As Double
Dim dYmin As Double
'get the xy domain extent of the dataset
pSpatRef.GetDomain(dXmin, dXmax, dYmin, dYmax)
Debug.Print(dXmin & ", ", dXmax & ", " & dYmin, ", " & dYmax)
End Sub