VCS

Synthèse

Provides information about the vertical coordinate system (VCS) component of a SpatialReference object.

Discussion

Spatial references are comprised of a coordinate system and storage and processing parameters (tolerances and resolution settings). A VCS may also be included, containing information about the Z (or vertical) coordinates. For example, a point has a Z value of 100.0, but without knowing it's VCS information we are left with the following questions:

• 100.0 from what? What is at 0.0?
• 100.0 in what units? Meters, feet, miles?
• 100.0 in which direction from 0.0?

Propriétés

Propriété	Explication	Type de données
datumName (Lecture et écriture)	The name of the vertical coordinate system's datum.	String
direction (Lecture et écriture)	The positive direction of the z coordinates; 1 is upward, -1 is downwards(in the direction of gravity).	Integer
factoryCode (Lecture et écriture)	The factory code or WKID of the vertical coordinate system.	Integer
linearUnitName (Lecture et écriture)	The name of the linear units.	String
metersPerUnit (Lecture et écriture)	The meters per linear unit.	Double
name (Lecture et écriture)	The name of the vertical coordinate system.	String
verticalShift (Lecture et écriture)	The vertical shift of the vertical coordinate system.	Double

Exemple de code

import arcpy

# Create a Spatial Reference (Europe Equidistant Conic) with a VCS (EVRF_2007)
sr = arcpy.SpatialReference(102031, 5621)

# Use the SpatialReference as input to a tool
out = arcpy.management.CreateFeatureDataset(outgdb, "euro_fds", sr)

# Describe the output to confirm the VCS factoryCode
sr = arcpy.Describe(out[0]).spatialReference
print(sr.VCS.factoryCode)  # prints 5621