Defines 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, boolean DefaultXYResolution, boolean DefaultXYTolerance)
|
Parameter |
Description |
|
WKT |
A string that defines a well-known text string
for a pre-defined spatial reference. |
|
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. |
|
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). |
|
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