如何在 python 文件中从一个多边形移动到另一个多边形？

Question

shp 中有 3 个多边形。文件。

需要找到每个坐标的最小值/最大值。下一个我只能做1:

import arcpy # csv
from arcpy import env

print "Creating and defining variables."
env.workspace = r"C:\Users\Desktop\data"
env.overwriteOutput = 1

theme = 'interestAreas.shp' 
# Look for .next()  in SearchCursor, need a loop
# the same when we read line by line
for i in theme:
    Curs = arcpy.da.SearchCursor(theme, 'SHAPE@').next()
    polygon = Curs[0]
    ext = polygon.extent
del Curs

# Find min X, Y and max X, Y for each polygon and write it to the file:
print 'xmin is: ', ext.XMin
print 'ymin is: ', ext.YMin
print 'xmax is: ', ext.XMax
print 'ymax is: ', ext.YMax
minX = ext.XMin
minY = ext.YMin

如何使用 arcpy 和循环 for 或 while 来完成？或者如何遍历多边形的ID(1,2,3)？

感谢您的帮助。

Answer 1

我不是很习惯python，但每种语言的逻辑基本相同...你可能应该这样做（可能会有一些小的语法错误）：

polygons = arcpy.SearchCursor(theme, 'SHAPE@')
curPolygon = polygons.next()
while Curs:
    polygon = Curs[0]
    ext = polygon.extent

    # Find min X, Y and max X, Y for each polygon and write it to the file:
    print 'xmin is: ', ext.XMin
    print 'ymin is: ', ext.YMin
    print 'xmax is: ', ext.XMax
    print 'ymax is: ', ext.YMax
    minX = ext.XMin
    minY = ext.YMin

    # now look for next polygon description
    curPolygon = polygons.next()

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Answer 2

您的原始代码非常接近。您只需要移动并重新调整 for 循环以迭代光标，而不是 shapefile。我还建议在光标对象上使用 with，这样您就不需要管理它了。

import arcpy # csv
from arcpy import env

print "Creating and defining variables."
env.workspace = r"C:\Users\Desktop\data"
env.overwriteOutput = 1

theme = 'interestAreas.shp' 
with arcpy.da.SearchCursor(theme, ['SHAPE@']) as Curs:
    for i in Curs: # iterate through the rows in the cursor object
        polygon = i[0]
        ext = polygon.extent

        # Find min X, Y and max X, Y for each polygon and write it to the file:
        print 'xmin is: ', ext.XMin
        print 'ymin is: ', ext.YMin
        print 'xmax is: ', ext.XMax
        print 'ymax is: ', ext.YMax
        minX = ext.XMin
        minY = ext.YMin

如何在 python 文件中从一个多边形移动到另一个多边形？

how to move from one polygon to another in file in python?

python

points

arcpy