Ostatnio próbowałem to zrobić sam.
Moja wskazówka oparta jest na okrągłych punktach wokół przecięć linii, a także punktach znajdujących się w odległości jednego metra od wtargnięć. Dane wyjściowe to klasa elementów polilinii, która ma atrybuty liczby kątów na przecięciach i kącie.
Zauważ, że linie powinny być planowane w celu znalezienia skrzyżowań, a odniesienie przestrzenne musi być ustawione z poprawnym wyświetlaniem długości linii (moja to WGS_1984_Web_Mercator_Auxiliary_Sphere).
Działa w konsoli ArcMap, ale łatwo można go zmienić na skrypt w przyborniku. Ten skrypt używa tylko warstwy linii w spisie treści, nic więcej.
import arcpy
import time
mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
line = ' * YOUR POLYLINE FEATURE LAYER * ' # paste the name of line layer here
def crossing_cors(line_layer):
mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
arcpy.env.overwriteOutput = True
sr = arcpy.Describe(line_layer).spatialReference
dict_cors = {}
dang_list = []
with arcpy.da.UpdateCursor(line_layer, ['SHAPE@', 'OID@']) as uc:
for row in uc:
if row[0] is None:
uc.deleteRow()
with arcpy.da.UpdateCursor(line_layer, 'SHAPE@', spatial_reference = sr) as uc:
for row in uc:
line = row[0].getPart(0)
for cor in line:
coord = (cor.X, cor.Y)
try:
dict_cors[coord] += 1
except:
dict_cors[coord] = 1
cors_only = [f for f in dict_cors if dict_cors[f]!=1]
cors_layer = arcpy.CreateFeatureclass_management('in_memory', 'cross_pnt', "POINT", spatial_reference = sr)
arcpy.AddField_management(cors_layer[0], 'ANGLE_NUM', 'LONG')
with arcpy.da.InsertCursor(cors_layer[0], ['SHAPE@', 'ANGLE_NUM']) as ic:
for x in cors_only:
pnt_geom = arcpy.PointGeometry(arcpy.Point(x[0], x[1]), sr)
ic.insertRow([pnt_geom, dict_cors[x]])
return cors_layer
def one_meter_dist(line_layer):
mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
arcpy.env.overwriteOutput = True
sr = arcpy.Describe(line_layer).spatialReference
dict_cors = {}
dang_list = []
cors_list = []
with arcpy.da.UpdateCursor(line_layer, 'SHAPE@', spatial_reference = sr) as uc:
for row in uc:
line = row[0]
length_line = line.length
if length_line > 2.0:
pnt1 = line.positionAlongLine(1.0)
pnt2 = line.positionAlongLine(length_line - 1.0)
cors_list.append(pnt1)
cors_list.append(pnt2)
else:
pnt = line.positionAlongLine(0.5, True)
cors_layer = arcpy.CreateFeatureclass_management('in_memory', 'cross_one_meter', "POINT", spatial_reference = sr)
ic = arcpy.da.InsertCursor(cors_layer[0], 'SHAPE@')
for x in cors_list:
ic.insertRow([x])
return cors_layer
def circles(pnts):
import math
mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
arcpy.env.overwriteOutput = True
sr = df.spatialReference
circle_layer = arcpy.CreateFeatureclass_management('in_memory', 'circles', "POINT", spatial_reference = sr)
ic = arcpy.da.InsertCursor(circle_layer[0], 'SHAPE@')
with arcpy.da.SearchCursor(pnts, 'SHAPE@', spatial_reference = sr) as sc:
for row in sc:
fp = row[0].centroid
list_circle =[]
for i in xrange(0,36):
an = math.radians(i * 10)
np_x = fp.X + (1* math.sin(an))
np_y = fp.Y + (1* math.cos(an))
pnt_new = arcpy.PointGeometry(arcpy.Point(np_x,np_y), sr)
ic.insertRow([pnt_new])
del ic
return circle_layer
def angles(centers, pnts, rnd):
mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame
sr = df.spatialReference
line_lyr = arcpy.CreateFeatureclass_management('in_memory', 'line_angles', "POLYLINE", spatial_reference = sr)
arcpy.AddField_management(line_lyr[0], 'ANGLE', "DOUBLE")
arcpy.AddField_management(line_lyr[0], 'ANGLE_COUNT', "LONG")
ic = arcpy.da.InsertCursor(line_lyr[0], ['SHAPE@', 'ANGLE', 'ANGLE_COUNT'])
arcpy.AddField_management(pnts, 'ID_CENT', "LONG")
arcpy.AddField_management(pnts, 'CENT_X', "DOUBLE")
arcpy.AddField_management(pnts, 'CENT_Y', "DOUBLE")
arcpy.Near_analysis(pnts, centers,'',"LOCATION")
with arcpy.da.UpdateCursor(line, ['SHAPE@', 'OID@']) as uc:
for row in uc:
if row[0] is None:
uc.deleteRow()
with arcpy.da.UpdateCursor(pnts, [u'ID_CENT', u'CENT_X', u'CENT_Y', u'NEAR_FID', u'NEAR_DIST', u'NEAR_X', u'NEAR_Y'], spatial_reference = sr) as uc:
for row in uc:
row[0] = row[3]
row[1] = row[5]
row[2] = row[6]
uc.updateRow(row)
if row[4] > 1.1:
uc.deleteRow()
arcpy.Near_analysis(pnts, rnd,'',"LOCATION")
list_id_cent = []
with arcpy.da.UpdateCursor(pnts, [u'ID_CENT', u'CENT_X', u'CENT_Y', u'NEAR_FID', u'NEAR_DIST', u'NEAR_X', u'NEAR_Y', 'SHAPE@'], spatial_reference = sr) as uc:
for row in uc:
pnt_init = (row[-1].centroid.X, row[-1].centroid.Y)
list_id_cent.append([(row[1], row[2]), row[3], pnt_init])
list_id_cent.sort()
values = set(map(lambda x:x[0], list_id_cent))
newlist = [[y for y in list_id_cent if y[0]==x] for x in values]
dict_cent_angle = {}
for comp in newlist:
dict_ang = {}
for i, val in enumerate(comp):
curr_pnt = comp[i][2]
prev_p = comp[i-1][2]
init_p = comp[i][0]
angle_prev = math.degrees(math.atan2(prev_p[1]-init_p[1], prev_p[0]-init_p[0]))
angle_next = math.degrees(math.atan2(curr_pnt[1]-init_p[1], curr_pnt[0]-init_p[0]))
diff = abs(angle_next-angle_prev)%180
vec1 = [(curr_pnt[0] - init_p[0]), (curr_pnt[1] - init_p[1])]
vec2 = [(prev_p[0] - init_p[0]), (prev_p[1] - init_p[1])]
ab = (vec1[0] * vec2[0]) + (vec1[1] * vec2[1])
mod_ab = math.sqrt(math.pow(vec1[0], 2) + math.pow(vec1[1], 2)) * math.sqrt(math.pow(vec2[0], 2) + math.pow(vec2[1], 2))
cos_a = round(ab/mod_ab, 2)
diff = math.degrees(math.acos(cos_a))
pnt1 = arcpy.Point(prev_p[0], prev_p[1])
pnt2 = arcpy.Point(init_p[0], init_p[1])
pnt3 = arcpy.Point(curr_pnt[0], curr_pnt[1])
line_ar = arcpy.Array([pnt1, pnt2, pnt3])
line_geom = arcpy.Polyline(line_ar, sr)
ic.insertRow([line_geom , diff, len(comp)])
del ic
lyr_lst = [f.name for f in arcpy.mapping.ListLayers(mxd)]
if 'line_angles' not in lyr_lst:
arcpy.mapping.AddLayer(df, arcpy.mapping.Layer(line_lyr[0]))
centers = crossing_cors(line)
pnts = one_meter_dist(line)
rnd = circles(centers)
angle_dict = angles(centers, pnts, rnd)
