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This document is archived and information here might be outdated. Recommended version. |
ISpatialReference.GetDomain Method (ArcObjects .NET 10.8 SDK)
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This document is archived and information here might be outdated. Recommended version. |
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(
System.Double* XMin,
System.Double* XMax,
System.Double* YMin,
System.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*
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.
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