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ArcGIS:字段赋值_属性表字段计算器(Field Calculator)依据条件为字段赋值
2022-07-07 21:50:00 【BetterQ.】
当对ArcGIS中所加载数据属性表中的字段进行赋值时,可以点击“开始编辑”后手动为字段进行赋值,但当数据量较大时就需要使用Python来对其进行赋值。
打开属性表后,点击要为赋值的字段,右键点击选择“字段计算器”,如下图:
直接统一赋值:
直接在输入框中输入数字或者字母或者文字即可为该字段统一赋值。
.
.
按条件赋值:
当需要按条件赋值时,可以输入以下脚本进行:
.
def cal(f)
if f=='s':
return 1
if f=='a':
return 2
else:
return 99
如果需要根据值的大小为字段赋值可以输入如下代码:
def cal(f)
if f>50:
return 1
if f<100 and f>60:
return 2
else:
return 99
注意:
1、 由于使用的是python来进行编写,所以要格外注意空格和对齐,一般为缩进4个/8个空格,但是有时候也会是3个/7个空格。出现问题一般是因为空格缩进不对。
2、 当使用到文字时,需要对其进行转码,转为utf-8格式才可以被识别,如下:
def cal(f)
if f==('草地'.decode(utf-8)):
return 1
if f==('林地'.decode(utf-8)):
return 2
else:
return '其他'.decode(utf-8)
3、 不要忘记if后面加冒号,且均为英文的冒号。
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