//选择和选择几何体相交或在几何体内部的特征 pLayer->select(QgsAttributeList(),selectGeomTrans.boundingBox(),true,true); int nh=pLayer->selectedFeatureCount(); QgsFeatureIds newSelectedFeatures; QgsFeature f; int p=0; //得到当前选择的特征 while(pLayer->nextFeature(f)){ p++; QgsGeometry* g=...
manage selections and add and delete columns. The majority of the window is filled with the table body. The table can be sorted by clicking on the column names. An arrow will appear
You will see a columnSUMCapacitin the attribute table. This is the sum of theCapacityattribute for the nursing homes that fall within each borough feature. This is the answer we are looking for. But there are extra columns that we do not need in our output. Let’s clean up our output...
矢量数据的属性表通过图层右键菜单的“Open Attribute Table”选项打开。QGIS属性表有两种表现形式:表格视图(Table View)和表单视图(Form View),如图3-7所示。 图3-7 矢量数据图层的属性表 表格视图以数据为中心,以数据表的形式展示所有要素的属性。每个要素(Feature)都对应表格的一行(Row),也称为一个记录(Record...
geometry) # update an attribute with given field index (int) to a given value fieldIndex =1 value ='My new name' layer.changeAttributeValue(fid, fieldIndex, value) # add new field layer.addAttribute(QgsField("mytext", QMetaType.Type.QString)) # remove a field layer.deleteAttribute(field...
ZIP Column (optional): The name of the column in the CSV file containing ZIP Codes Street Layer: The map layer containing the street centerline features Street Name Attribute: The name of the field in the street layer containing street names Left From Number / Left To Number: The names of...
Data management: New configuration options for attribute table Data management: Multiple columns in attribute forms Data management: Control over attributes to export when saving a vector layer Data management: Forms view: side column now sortable Data management: Relation reference widget: shortcut for...
When the vertex tool is active, click on a vertex to select it. You can pressDeletekey to delete a vertex or drag it to move it. You can move the vertex so that the polygon edge now touches the adjacent polygon. Once done, click theToggle Editingbutton again and clickSave. ...
You can symbolize multiple fields in QGIS using the “set column expression” or “rule-based expression”. But in ArcGIS, it’s fast, easy, and intuitive using unique values, andmany fields. Dot density maps and stacked charts are unique qualities of ArcMap. ...
Previewing, organizing, and of course metadata creation. Despite these major tweaks,no recycling bincan be found to undo any accidental deletes. Heartbroken, I wait for this feature in a future release. A big complaint is because of the departure of the stand-alone ArcCatalog. Sometimes you ...