操作方法
ArcGIS Pro 允许使用诸如分割(分析)工具和修改要素窗格中的“分割”工具等工具将面要素分割为多条线段。 但是,提供的工具无法按百分比分割面。 请按照本文中提供的步骤,在 Python 窗口中按百分比分割面。
Note: Ensure the data added to the map and the map share the same projected coordinate system to avoid errors.
Import arcpy
p = arcpy.mp.ArcGISProject("CURRENT")
m = p.listMaps("<Map_Name>")[0]
lyr = m.listLayers(0)
splits = [20, 30, 50]
with arcpy.da.SearchCursor("<Layer_Name>", ["SHAPE@"]) as pcursor:
for prow in pcursor:
polygon = prow[0] # polygon to cut
e = polygon.extent # bounding extent of polygon
print(e.XMin,e.YMin,e.XMax,e.YMax)
del pcursor
stepsize = 0.001
leftXstart = e.XMin leftX = e.XMin + stepsize ymax = e.YMax ymin = e.YMin
cutpoly = polygon
icursor = arcpy.da.InsertCursor("<Layer_Name>", ["SHAPE@"])
for i in splits[:2]:
print(i)
tol = 0
while tol < i:
# construct NS line
pntarray = arcpy.Array()
pntarray.add(arcpy.Point(leftX, ymax))
pntarray.add(arcpy.Point(leftX, ymin))
pline = arcpy.Polyline(pntarray,arcpy.SpatialReference(<WKID>))
# cut polygon and get split-parts
cutlist = cutpoly.cut(pline)
tol = 100 * cutlist[1].area / polygon.area
leftX += stepsize
#print str(leftX) + ":" + str(tol)
cutpoly = cutlist[0]
icursor.insertRow([cutlist[1]])
# part 0 is on the right and part 1 is on the left of the split
icursor.insertRow([cutlist[0]]) del icursor
以下代码显示了完整的工作脚本:
Import arcpy
p = arcpy.mp.ArcGISProject("CURRENT")
m = p.listMaps("Map")[0]
lyr = m.listLayers(0)
splits = [20, 30, 50]
with arcpy.da.SearchCursor("testpolygon", ["SHAPE@"]) as pcursor:
for prow in pcursor:
polygon = prow[0]
e = polygon.extent
print(e.XMin,e.YMin,e.XMax,e.YMax)
del pcursor
stepsize = 0.001
leftXstart = e.XMin
leftX = e.XMin + stepsize
ymax = e.YMax
ymin = e.YMin
cutpoly = polygon
icursor = arcpy.da.InsertCursor("testpolygon", ["SHAPE@"])
for i in splits[:2]:
print(i)
tol = 0
while tol < i:
pntarray = arcpy.Array()
pntarray.add(arcpy.Point(leftX, ymax))
pntarray.add(arcpy.Point(leftX, ymin))
pline = arcpy.Polyline(pntarray,arcpy.SpatialReference(3857))
cutlist = cutpoly.cut(pline)
tol = 100 * cutlist[1].area / polygon.area
leftX += stepsize
cutpoly = cutlist[0]
icursor.insertRow([cutlist[1]])
icursor.insertRow([cutlist[0]])
del icursor
下图演示了在 ArcGIS Pro 中运行 Python 脚本后,按 20%、30% 和 50% 来分割面。

文章 ID: 000027999
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