摘要
网络源方向对象将提供用于生成行驶方向(特定于网络数据集中的边源)的信息。
属性
属性 | 说明 | 数据类型 |
adminAreaFieldName (只读) | 包含生成行驶方向的行政区信息的字段名称。 如果没有为网络数据集定义行政区信息,则 adminAreaFieldName 属性会抛出异常。 | String |
streetNameFields (只读) | 返回此网络源的街道名称字段对象的 Python 列表。 | List |
shields (只读) | 返回盾形路牌符号对象。可利用该对象确定用于行驶方向中的盾形路牌符号属性。如果没有为网络数据集定义盾形路牌符号信息,则盾形路牌符号属性会抛出异常。 | Object |
代码示例
网络源方向属性示例
显示网络数据集中特定于边源的方向信息。
# Name: NDSNetworkSourceDirectionProperties_ex01.py
# Description: Print direction settings specific to edge sources in the network
# dataset.
import arcpy
import sys
# Set the workspace
arcpy.env.workspace = "C:/Data/SanFrancisco.gdb/Transportation"
# Create Describe object for the network dataset
desc = arcpy.Describe("Streets_ND")
#If the directions are not set for the network dataset, exit
if not desc.supportsDirections:
print "No direction information"
sys.exit()
print "Source Direction Information ----"
# Get all the edge sources
sources = desc.edgeSources
#If there are no edge sources in the network dataset, quit.
if not sources:
print "No edge sources"
sys.exit()
#Loop through all the edge sources
for source in sources:
print "--------------------"
print "Name: " , source.name
print "Source ID: " , source.sourceID
#Print the direction information specific to edge source
sDir = source.sourceDirections
# Check if the administrative area information is defined for the network
#dataset. Otherwise adminAreaFieldName property throws an exception
if hasattr(sDir, "adminAreaFieldName"):
print "Administrative area field: " , sDir.AdminAreaFieldName
else:
print "Administrative area field: " , "Not set"