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ISpatialReferenceResolution Interface (ArcObjects .NET 10.4 SDK)
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This document is archived and information here might be outdated. Recommended version. |
| ArcObjects namespaces > Geometry > ESRI.ArcGIS.Geometry > Interfaces > IS > ISpatialReferenceResolution Interface (ArcObjects .NET 10.4 SDK) |
Provides access to members that control the resolution of a spatial reference.
| Description | ||
|---|---|---|
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ConstructFromHorizon | Defines the XY resolution and domain extent of this spatial reference based on the extent of its horizon. Low precision SRs will have minimum resolution of 1/10mm in current units. |
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MResolution | The M, or measure, resolution of this spatial reference. |
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SetDefaultMResolution | Sets the m coordinate grid resolution to 1 mm for a low precision spatial reference or 1/10 mm for a high precision spatial reference. |
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SetDefaultXYResolution | defaults: PCS(hi): 1/10 mm; PCS(lo): 1 mm; GCS(hi): 1/10,000 arc-second; GCS(lo): 1/500 arc-second; UCS(hi): 1/10 mm (assumed); UCS(lo): 1 mm (assumed). |
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SetDefaultZResolution | Sets the z coordinate grid resolution to 1 mm for a low precision spatial reference or 1/10 mm for a high precision spatial reference. |
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XYResolution | The XY resolution (distance in SR units between distinguishable grid points) of this spatial reference. Reported in meters for PCS/UCS and degrees for GCS when bStandardUnits is true or in current units of SR when it is false. |
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ZResolution | The Z resolution (height/depth distance between distinguishable grid points) of this spatial reference. Reported in meters when bStandardUnits is true or in current units of SR when it is false. |
| CoClasses and Classes | Description |
|---|---|
| GeographicCoordinateSystem | Creates a geographic coordinate system. |
| ProjectedCoordinateSystem | Creates a projected coordinate system. |
| UnknownCoordinateSystem | Creates an unknown coordinate system. |
The ISpatialReferenceResolution interface is used to define default and custom grid origins, extents and resolutions for the XY, Z and M coordinate grids associated with a spatial reference. The terms resolution and precision are synonymous within the context of the spatial reference system and the former refers to the inverse of the scale factor. Methods on this interface can define coordinate grid resolutions and extent based on a known spatial reference horizon, or alter extents and resolutions in a controlled way (for example, enlarge the extent about its current center by specifying a larger (coarser) target resolution).
//The following code shows how to use ISpatialReferenceResolution interface and methods
ISpatialReferenceFactory spatialReferenceFactory=new SpatialReferenceEnvironmentClass();
ISpatialReference spatialReference=spatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile("C:\\Program Files\\ArcGIS\\Coordinate Systems\\Geographic Coordinate Systems\\World\\WGS 1984.prj");
IControlPrecision2 controlPrecision=spatialReference as IControlPrecision2;
//Flip this to false if low precision
controlPrecision.IsHighPrecision=true;
ISpatialReferenceResolution spatialReferenceResolution=spatialReference as ISpatialReferenceResolution;
//this is the KEY, Construct Horizon THEN
spatialReferenceResolution.ConstructFromHorizon();
//Set Default
spatialReferenceResolution.SetDefaultXYResolution();
double xMin;
double xMax;
double yMin;
double yMax;
spatialReference.GetDomain(out xMin, out xMax, out yMin, out yMax);
System.Windows.Forms.MessageBox.Show("Domain : " + xMin + ", " + xMax + ", " + yMin + ", " + yMax);
'The following code shows how to use ISpatialReferenceResolution interface and methods
Dim pSR As ISpatialReference2
Dim pSRF As ISpatialReferenceFactory3
Dim pSRResolution As ISpatialReferenceResolution
Dim pControlPrecision2 As IControlPrecision2
Dim XMin As Double
Dim XMax As Double
Dim YMin As Double
Dim YMax As Double
pSRF=New SpatialReferenceEnvironment
pSR=pSRF.CreateESRISpatialReferenceFromPRJFile("D:\ArcGIS\Coordinate Systems\Geographic Coordinate Systems\World\WGS 1984.prj")
pSRResolution=pSR
pControlPrecision2=pSR
pControlPrecision2.IsHighPrecision=True 'Flip this to false if low precision
pSRResolution.ConstructFromHorizon() 'this is the KEY, Construct Horizon THEN
pSRResolution.SetDefaultXYResolution() 'Set Default
pSR.GetDomain(XMin, XMax, YMin, YMax)
Debug.Print("Domain : ", XMin, XMax, YMin, YMax)