使用Python将自定义要素属性添加到ESRI Shapefile [英] Adding custom Feature attributes to ESRI Shapefile with Python

问题描述

我正在寻找一种采用现有ESRI Shapefile的方法，该文件具有200个国家/地区的功能集.每个国家/地区要素的属性均为"NAME".我的目标是创建一个Python脚本，该脚本添加一个任意的(暂时)附加属性，例如"POPULATION".

I am seeking a way to take an existing ESRI Shapefile that has a Feature set of 200 countries. Each country Feature has an attribute of "NAME." My objective is to create a Python script that adds an arbitrary (for now) additional attribute, say, "POPULATION".

我当然已经安装了OSGeo和GeoDjango模块.我距离:

Of course I have the OSGeo and GeoDjango modules installed. I'm as far as:

from osgeo import ogr

infile = ogr.Open('sample.shp', 1) #'sample.shp' is a pre-existing ESRI shapefile described above
inlyr = infile.GetLayerByIndex(0)

我是否缺少OGR函数，该函数将允许我将Feature属性字段插入到现有的Shapefile中?

Am I missing an OGR function that will allow me to insert Feature attribute fields into an existing Shapefile?

推荐答案

要添加字段，您必须创建OGRFieldDefn，然后调用inlyr.CreateField

To add a field you have to create an OGRFieldDefn and then call inlyr.CreateField

fieldDefn = ogr.FieldDefn('POPULATION', ogr.OFTReal) 
fieldDefn.SetWidth(14) 
fieldDefn.SetPrecision(6)
inlyr.CreateField(fieldDefn)

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