.shp文件的属性表格式如下：
street_name start_node end_node
street_1 A B
street_1 B C
street_2 B D
如何使用开始和结束节点创建链接，然后为每个链接分配与其开始和结束节点关联的街道名称。例如，与起始节点A和结束节点B的链接应该得到名称＆＃34; street_1＆＃34;并且具有起始节点B和结束节点D的街道应该得到名称＆＃34; street_2＆＃34;。
我使用foreach gis:feature-list-of来链接数据集的节点，但这样我就无法根据其开始和结束节点命名链接，因为某些节点在街道段之间共享。
非常感谢。
修改
我感兴趣的属性表的列是name1，startNode和endNode。我已经使用下面的代码连接了节点，现在我有一个完全连接的道路网络。我不确定如何集成您的代码，以便节点之间的链接将获得与形成该链接的节点组合相关联的名称。
foreach gis:feature-list-of roads-dataset [ vector-feature ->
foreach gis:vertex-lists-of vector-feature [ vertex ->
let previous-turtle nobody
foreach vertex [point ->
let location gis:location-of point
if not empty? location
[
let x item 0 location
let y item 1 location
let current-node one-of (turtles-on patch x y) with [ xcor = x and ycor = y ]
if current-node = nobody [
create-nodes 1 [
setxy x y
set size 0.2
set shape "circle"
set color black
set hidden? true
set name gis:property-value vector-feature "name1"
set current-node self
]
]
ask current-node [
if is-turtle? previous-turtle [
create-link-with previous-turtle
]
set previous-turtle self
]
]
]
]
]
答案 0 :(得分：1)
您是说您的节点现在已在模型中正确命名？如果是这种情况，这里是一个可能适合您的方法的简化版本。我会注意到这不是一个非常有效的方法，因为它循环你的链接和你的属性表，所以如果你有很多链接，它将需要一段时间。首先，由于我没有你的shapefile，我已经制作了你的链接示例版本：
extensions [csv]
globals [ whole-file ]
turtles-own [ node ]
links-own [ name ]
to setup
ca
reset-ticks
let names [ "A" "B" "C" "D" ]
let n 0
crt 4 [
setxy random 30 - 15 random 30 - 15
set node item n names
set n n + 1
]
ask turtles with [ node = "A" ] [
create-links-to turtles with [node = "B" ]
]
ask turtles with [ node = "B" ] [
create-links-to turtles with [ node = "C" or node = "D" ]
]
end
这只是构建了四只乌龟，链接如示例shapefile属性表所示。我正在使用一个名为“node_example.csv”的文件，如下所示：
street_name start_node end_node
1 street_1 A B
2 street_1 B C
3 street_2 B D
有四列，第一列是观察号。
基本上，方法是遍历列表并从end1到end2拉出节点的名称，反之亦然（因为both-ends会随机抽取它们（）），并将它们与表格中的每个start_node和end_node组合进行比较。如果匹配，请将该行的street_name分配给匹配的链接：
to link-name
set whole-file csv:from-file "node_example.csv"
foreach sort links [
[ i ] ->
show i
let way-1 list ( [node] of [end1] of i ) ( [node] of [end2] of i )
let way-2 list ( [node] of [end2] of i ) ( [node] of [end1] of i )
foreach whole-file [
[j] ->
if sublist j 2 4 = way-1 or sublist j 2 4 = way-2 [
ask i [
set name item 1 j
]
]
]
]
ask links [
print name
print (word [node] of end1 [node] of end2 )
]
end
显然，这取决于你的模型中命名的节点（在这个例子中，使用的变量是node） - 如果不是这样的话，这将不起作用。
修改1
好的，我使用你的shapefile玩了一下。这还不完美，我暂时不能继续工作了，但也许它会让你开始。使用此设置：
extensions [gis]
breed [ nodes node ]
globals [ roads-dataset ]
turtles-own [ name line-start line-end]
links-own [ lname ]
我的想法是将开始和结束节点名称分配给沿线要素的每个点，以便链接可以检查要素列表。评论中有更具体的注释，但我基本上修改了你的gis-feature-node代码来做到这一点。稍微玩一下（需要一段时间才能运行），你会看到我还没有想到的差距 - 也许你可以取得进展。
to gis-feature-node
set roads-dataset gis:load-dataset "road_links.shp"
foreach gis:feature-list-of roads-dataset [ vector-feature ->
; First, grab the names of the starting and ending node for the current
; vector feature in order to assign common names to all nodes within
; the feature
let first-vertex gis:property-value vector-feature "startNode"
let last-vertex gis:property-value vector-feature "endNode"
foreach gis:vertex-lists-of vector-feature [ vertex ->
let previous-turtle nobody
foreach vertex [ point ->
let location gis:location-of point
if not empty? location
[
let x item 0 location
let y item 1 location
let current-node one-of (turtles-on patch x y) with [ xcor = x and ycor = y ]
if current-node = nobody [
create-nodes 1 [
setxy x y
set size 0.05
set shape "circle"
set color white
set hidden? false
set name gis:property-value vector-feature "name1"
; Here you assign the first-vertex and last-vertex of the entire line
; to each node
set line-start first-vertex
set line-end last-vertex
set current-node self
]
]
ask current-node [
if is-turtle? previous-turtle [
create-link-with previous-turtle
]
set previous-turtle self
]
]
]
]
]
ask links [
;; Here is a major slowdown- reiterate through the entire roads-dataset
; and, if the names in "startNode" and "endNode" match, assign the
; value from "name1" to the link currently being created.
let way-1 list [line-start] of end1 [line-end] of end2
let way-2 list [line-end] of end1 [line-start] of end2
foreach gis:feature-list-of roads-dataset [ vector-feature-sub ->
let vector-start gis:property-value vector-feature-sub "startNode"
let vector-end gis:property-value vector-feature-sub "endNode"
let start-end list vector-start vector-end
if way-1 = start-end or way-2 = start-end [
set lname gis:property-value vector-feature-sub "name1"
]
]
]
ask links with [ lname = "Hamilton Place" ] [
set color red
set thickness 0.2
]
ask links with [ lname = "Whitcomb Street" ] [
set color yellow
set thickness 0.2
]
end
编辑2
下面的代码经过测试并且有效 - 问题已排序。
ask links [
set is-road? true
;; Here is a major slowdown- reiterate through the entire roads-dataset
; and, if the names in "startNode" and "endNode" match, assign the
; value from "name1" to the link currently being created.
let way-1 list [line-start] of end1 [line-end] of end2
let way-2 list [line-end] of end1 [line-start] of end2
let way-3 list [ line-start ] of end1 [ line-end ] of end1
let way-4 list [ line-start ] of end2 [ line-end ] of end2
foreach gis:feature-list-of roads-dataset [ vector-feature-sub ->
let vector-start gis:property-value vector-feature-sub "startNode"
let vector-end gis:property-value vector-feature-sub "endNode"
let start-end list vector-start vector-end
let end-start list vector-end vector-start
if way-1 = start-end or way-2 = start-end or way-3 = start-end or way-4 = start-end [
set lname gis:property-value vector-feature-sub "name1"
]
]
]