图标,打开字段计算器 (Field Calculator)。如图 6,勾选 Update existing field, 选择刚才创建的 `BldgHeight`,并在填写表达式的文本框中填入下述表达式,确定。case when "height" is Null then 0 else "height" end 最后保存。 第二种方法,是直接使用原来的数据,但是在设置图层样式时使用表达式来进行转换。设置...
In the Field Calculator's dialog window, the "OK" and "Apply" buttons are currently incorrectly enabled when "Update existing field" checkbox is checked and no field is selected in the fields' list combobox. That behaviour may trick the user: seehttps://gis.stackexchange.com/questions/487749...
- General : Field calculator can be used to update feature's geometry - General : Virtual layers - General : Zoom to feature with right-click in attribute table - General : Speed improvements - General : More expression variables - General : New expression functions in 2.14 ...
General : Field calculator can be used to update feature's geometry General : Virtual layers General : Zoom to feature with right-click in attribute table General : Speed improvements General : More expression variables General : New expression functions in 2.14 General : Better control over placem...
The Field Calculator in QGIS is a powerful tool that allows you to perform calculations on the attributes of a vector layer. Here are a few examples of things
Selection by location has been improved with its interactive selection tool. When records are selected, they can be filtered even more so (selected from, added to, removed from). The field calculator supports Python and VB to execute code. ...
Instead of a static value, QGIS succeeds in a big way how you can dynamically use multiple values in a field. Also, you can use an“In Case” and “Else” statementbased on categorical variables. On the other hand, geometry generators render modified or new geometry based on values entered...
FieldCalculator.py [v0.4.0] New option to calculate the expression on existing features … Sep 10, 2016 ImportAutoFieldsDialog.py Final touches before releasing v0.5.0 Apr 21, 2017 LICENSE Uploading AutoFields plugin [v.0.2.5] to GitHub. ...
General : Field calculator can be used to update feature's geometry General : Virtual layers General : Zoom to feature with right-click in attribute table General : Speed improvements General : More expression variables General : New expression functions in 2.14 General : Better control over placem...
按最右边的算盘 (?!) 图标,打开字段计算器 (Field Calculator)。如图 6,勾选 Update existing field, 选择刚才创建的 `BldgHeight`,并在填写表达式的文本框中填入下述表达式,确定。case when "height" is Null then 0 else "height" end 最后保存。