Finds a spatial reference based upon its well
known text string (WKT) and optionally a WKT for a vertical datum (WKT_Z).
The resolution and XY tolerances are either computed from the spatial
reference horizon or set to defaults.
FindSRByWKT(string WKT, string WKT_Z, bool DefaultXYResolution, bool DefaultXYTolerance)
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Parameter |
Description |
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WKT |
A string that defines a well-known text string for a pre-defined spatial reference. |
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WKT_Z |
As a string, if WKT_Z is specified and not empty, then a vertical coordinate system will be created and associated with the horizontal coordinate system. |
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DefaultXYResolution |
If true, then the XY coordinate grid resolution will be set to its default value (see the default XY resolution values table in the FindSRByWKID method remarks section for more details). If false, the finest possible resolution that covers the horizon of the spatial reference will be used (see "Defining an XY resolution" in the FindSRByWKID method remarks section for more details). |
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DefaultXYTolerance |
If true, then the default XY tolerance of 1mm will be used (see "Default XY Tolerance calculations" in the FindSRByWKID method remarks section for more details). If false, then the minimum allowable XY tolerance will be used (2.0 * XY resolution). |
Return Value
A SpatialReference
object. The output spatial reference is always
high precision.
Remarks
Finds a predefined spatial reference based
on its OGC/EPSG definition string, otherwise known as its well-known text
string (WKT). The text string contains individual
parameters of a spatial reference. A valid spatial reference for a geographic
coordinate system (GEOGCS) may appears as follows:
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]
Note the nested structure of parameters includes
a datum, spheriod, prime meridian, and angular unit.
A valid spatial reference for a projected coordinate system (PROJCS) may
appears as follows:
PROJCS["World_Mercator",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],
PROJECTION["Mercator"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],UNIT["Meter",1.0]]]
Note the nested structure of parameters includes a geographic coordinate
system (GEOGCS), a projection, and a set of projection parameters such
as false easting, false northing, and standard parallel.
Examples