How to use pyshp to read and write shp files in python-Python Tutorial-php.cn

How to use pyshp to read and write shp files in python

王林

Release： 2023-04-26 13:04:21

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Installation

pip install pyshp

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Introduction

import shapefile

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Read

sf=shapefile.Reader("{pathname} ",encoding='utf-8') # Only read

shapes and shape

shapes=sf.shapes() The return value is a list containing all the "geometry" in the file Data" object

shape=sf.shape(0) Shape is the first "geometric data" object

shapeType returns the collection type

returns The data type attribute of the first object

    几何类型
    NULL = 0
    POINT = 1
    POLYLINE = 3
    POLYGON = 5
    MULTIPOINT = 8
    POINTZ = 11
    POLYLINEZ = 13
    POLYGONZ = 15
    MULTIPOINTZ = 18
    POINTM = 21
    POLYLINEM = 23
    POLYGONM = 25
    MULTIPOINTM = 28
    MULTIPATCH = 31
   print(shape.shapeType)

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bbox Returns the data range

shape.bbox Returns the data range of the first collection object (x, y in the lower left corner coordinates and the x, y coordinates of the upper right corner)

points All coordinate points

shape.points Returns all coordinate points of the first collection object

parts Returns the coordinates of the first point of the "block"

shape.parts Returns the coordinates of the first point of each "block" of the first object

records and record

Get the attribute list

records

Get the attribute list, it is a function

sf. records();

The returned value is a list

record
Get a piece of data

sf.record(0)
The returned value is class

shapeRecords

Get record and shape at the same time

# 同时读取geometry and records
sf.shapeRecords()
获取所有
red=sf.shapeRecords()[0]  #获取第一条数据
print(red.record)  #获取record
print(red.shape)   #获取shape

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fields

Get shp file attribute field

print(sf.fields)
[(&#39;DeletionFlag&#39;, &#39;C&#39;, 1, 0), [&#39;OBJECTID&#39;, &#39;N&#39;, 9, 0], [&#39;BSM&#39;, &#39;C&#39;, 12, 0], [&#39;PXZQDM&#39;, &#39;C&#39;, 2, 0], [&#39;PXZQMC&#39;, &#39;C&#39;, 50, 0]]

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Write

import shapefile
outshp = &#39;a.shp&#39;
 
 landlist=[ &#39;84.60212,45.03658,84.60794,45.03938,84.61473,45.04151,84.62442,45.04375,84.62727,45.03632,84.63939,45.0367,84.64906,45.03277,84.63886,45.02233&#39;,
    &#39;84.58063,45.05523,84.57974,45.04717,84.59864,45.04792,84.60078,45.05523,84.58758,45.05473,84.58223,45.05523&#39;
]
def tramform(lat_lng):
    str =lat_lng
    str = str.split(&#39;,&#39;)
    arr = []
    for i in range(len(str) - 1):
        # 第一列，第二列作为经纬度（x，y）创建点
        if i % 2 == 0:
            arr.append([float(str[i]), float(str[i + 1])])
    return arr
fileWrite = shapefile.Writer("create/1.shp",encoding=&#39;utf-8&#39;)  # 新建数据存放位置

# shp文件属性字段 Fid,Shape会自动生成。
fileWrite.field(&#39;landid&#39;)
fileWrite.field(&#39;landName&#39;)

for i in range(len(landlist)):
    # 第一步：塞入形状
    ## 这个形状指的就是那些点的集合
    ## 由于源码中要求的输入是列表，因此就算只塞入一个，也要套一个列表
    arr=[]
    arr=tramform(landlist[i])
    #[[84.60212, 45.03658], [84.60794, 45.03938], [84.61473, 45.04151], [84.62442, 45.04375], [84.62727, 45.03632], [84.63939, 45.0367], [84.64906, 45.03277], [84.63886, 45.02233]]
    #poly 写入面，点线面使用不同函数
    fileWrite.poly([arr])

    # 第二步：塞入属性值
    fileWrite.record(str(i), &#39;地块&#39;)
# 保存结束
fileWrite.close()

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