Question

我想使用shapefile提供的pyshp生成一个包含五个点的.shp。但是，当我遍历我的列表时，我只得到最后一个值。这是有道理的，因为我没有将任何点附加到空列表（例如new_shp = []）

import shapefile as sf
import os

filename2 = 'test/point10'
lis = [(33.21, -122.15, 'france'), (35.31, -122.15, 'germany'), (35.41, -123.15, 'Hawaii'), (30.51, -122.15, 'Philippines'),(32.30, -122.15, 'Texas')]
for l in lis:
    w = sf.Writer(sf.POINT)
    w.point(l[0], l[1])
    w.field('location')
    w.record(l[2], 'Point')
    w.save(filename2)

# create the PRJ file
prj = open("%s.prj" % filename2, "w")
epsg = 'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]]'
prj.write(epsg)
prj.close()

我在假设我必须在for循环的某处附加所有点，但我不明白如何实际追加它。如何有效地遍历lis以获得包含所有五个点的.shp文件？

Answer 1

要附加到保存文件，我只需重新安排一些条款。没有空的附加列表需要进行。

import shapefile as sf
import os

filename2 = 'test/point16'

lis = [(33.21, -122.15, 'france'), (35.31, -122.15, 'germany'), (35.41, -123.15, 'Hawaii'), (30.51, -122.15, 'Philippines'),(32.30, -122.15, 'Texas')]

w = sf.Writer(sf.POINT)
w.field('location')

for l in lis:
    w.point(l[0], l[1])
    w.record(l[2], 'Point')
w.save(filename2)

# create the PRJ file
prj = open("%s.prj" % filename2, "w")
epsg = 'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]]'
prj.write(epsg)
prj.close()

我在哪里用pyshp追加点值

1 个答案: