ODCostMatrixSolverProperties (arcpy.na)

摘要

用于访问起始 - 目的地 (OD) 成本矩阵网络分析图层中的分析属性。GetSolverProperties 函数用于从 OD 成本矩阵网络分析图层中获取 ODCostMatrixSolverProperties 对象。

讨论

ODCostMatrixSolverProperties 对象提供对 OD 成本矩阵网络分析图层中所有分析属性的读取和写入权限。该对象可用于修改 OD 成本矩阵图层的分析属性，并重新求解相应图层以确定合适结果。使用 Make OD Cost Matrix Layer 地理处理工具可创建新的 OD 成本矩阵图层。通过从获取该图层的 ODCostMatrixSolverProperties 对象，可重新对现有图层进行后续分析，而无需每次分析都创建一个新图层，以节省时间。

修改 ODCostMatrixSolverProperties 对象的属性后，可立即使用其他函数和地理处理工具分析相应图层。无需刷新或更新图层，通过上述对象进行的修改便可生效。

属性

属性	说明	数据类型
accumulators (读写)	Provides the ability to get or set a list of network cost attributes that are accumulated as part of the analysis. An empty list, [], indicates that no cost attributes are accumulated.	String
attributeParameters (读写)	Provides the ability to get or set the parameterized attributes to be used in the analysis. The property returns a Python dictionary. The dictionary key is a two-value tuple consisting of the attribute name and the parameter name. The value for each item in the dictionary is the parameter value. Parameterized network attributes are used to model some dynamic aspect of an attribute's value. For example, a tunnel with a height restriction of 12 feet can be modeled using a parameter. In this case, the vehicle's height in feet should be specified as the parameter value. If the vehicle is taller than 12 feet, this restriction will then evaluate to true, thereby restricting travel through the tunnel. Similarly, a bridge could have a parameter to specify a weight restriction. Attempting to modify the attributeParameters property in place won't result in updated values. Instead, you should always use a new dictionary object to set values for the property. The following two code blocks demonstrate the difference between these two approaches. #Don't attempt to modify the attributeParameters property in place. #This coding method won't work. solverProps.attributeParameters[('HeightRestriction', 'RestrictionUsage')] = "PROHIBITED" #Modify the attributeParameters property using a new dictionary object. #This coding method works. params = solverProps.attributeParameters params[('HeightRestriction', 'RestrictionUsage')] = "PROHIBITED" solverProps.attributeParameters = params If the network analysis layer does not have parameterized attributes, this property returns None.	Dictionary
defaultCutoff (读写)	Provides the ability to get or set the default impedance value at which to cut off searching for destinations for a given origin. A value of None is used to specify that no cutoff should be used.	Double
defaultTargetDestinationCount (读写)	Provides the ability to get or set the number of destinations to find for each origin. A value of None is used to specify that all destinations should be found.	Integer
impedance (读写)	Provides the ability to get or set the network cost attribute used as impedance. This cost attribute is minimized while determining the routes between origins and destinations.	String
outputPathShape (读写)	Controls whether a straight line is generated between each origin-destination pair in the output OD cost matrix. The following is a list of possible values: NO_LINES —No shape is generated between origin-destination pairs. This is useful when you have a large number of origins and destinations and are interested only in the OD cost matrix table (and not the output line shapes). STRAIGHT_LINES —A single straight line between each of the origin-destination pairs is generated.	String
restrictions (读写)	Provides the ability to get or set a list of restriction attributes that are applied for the analysis. An empty list, [], indicates that no restriction attributes are used for the analysis.	String
solverName (只读)	Returns the name of the solver being referenced by the network analysis layer used to obtain the solver properties object. The property always returns the string value OD Cost Matrix Solver when accessed from a ODCostMatrixSolverProperties object.	String
timeOfDay (读写)	Provides the ability to get or set the departure date and time from the origins. A value of None can be used to specify that no date and time should be used. Instead of using a particular date, a day of the week can be specified using the following dates: 今天 - 12/30/1899 星期日 - 12/31/1899 星期一 - 1/1/1900 星期二 - 1/2/1900 星期三 - 1/3/1900 星期四 - 1/4/1900 星期五 - 1/5/1900 星期六 - 1/6/1900 For example, to specify that the route from each origin should start at 8:00 AM on Wednesday, specify the value as datetime.datetime(1900, 1, 3, 8,0,0).	DateTime
useHierarchy (读写)	Controls the use of the hierarchy attribute while performing the analysis. The following is a list of possible values: USE_HIERARCHY — Use the hierarchy attribute for the analysis. Using a hierarchy results in the solver preferring higher-order edges to lower-order edges. Hierarchical solves are faster, and they can be used to simulate the preference of a driver who chooses to travel on freeways over local roads when possible—even if that means a longer trip. This option is applicable only if the network dataset referenced by the Network Analyst layer has a hierarchy attribute. A value of True can also be used to specify this option. NO_HIERARCHY —Do not use the hierarchy attribute for the analysis. Not using a hierarchy yields an exact route for the network dataset. A value of False can also be used to specify this option.	String
uTurns (读写)	Provides the ability to get or set the policy that indicates how the U-turns at junctions that could occur during network traversal between stops are being handled by the solver. The following is a list of possible values: ALLOW_UTURNS —U-turns are permitted at junctions with any number of connected edges. NO_UTURNS —U-turns are prohibited at all junctions, regardless of junction valency. Note, however, that U-turns are still permitted at network locations even when this setting is chosen; however, you can set the individual network locations' CurbApproach property to prohibit U-turns there as well. ALLOW_DEAD_ENDS_ONLY —U-turns are prohibited at all junctions, except those that have only one adjacent edge (a dead end). ALLOW_DEAD_ENDS_AND_INTERSECTIONS_ONLY —U-turns are prohibited at junctions where exactly two adjacent edges meet but are permitted at intersections (junctions with three or more adjacent edges) and dead ends (junctions with exactly one adjacent edge). Oftentimes, networks have extraneous junctions in the middle of road segments. This option prevents vehicles from making U-turns at these locations.	String

代码实例

ODCostMatrixSolverProperties 示例（Python 窗口）

该脚本显示如何更新 OD 成本矩阵网络分析图层，以找到五分钟中断范围内的所有目的地。它假设已经在新地图文档中根据旧金山地区的网络数据集创建名为 Store Accessibility 的 OD 成本矩阵图层。

#Get the OD cost matrix layer object from a layer named "Store Accessibility" in
#the table of contents
odLayer = arcpy.mapping.Layer("Store Accessibility")

#Get the solver properties object from the OD cost matrix layer
solverProps = arcpy.na.GetSolverProperties(odLayer)

#Update the properties for the OD cost matrix layer using the solver properties
#object
solverProps.defaultCutoff = 5
solverProps.defaultTargetDestinationCount = None