arcgis自动编号代码

在ArcGIS中，可以通过使用VBScript或Python编写脚本来实现自动编号。其中VBScript代码如下：

Dim pEditor As Editor: Set pEditor = Application.FindExtensionByName("ESRI Object Editor")
Dim pSketch As IEditor3DDrawing: Set pSketch = pEditor
Dim pFeat As IFeature

pSketch.StartDrawing pEditor.Display, pEditor.EditWorkspace
Set pFeat = pEditor.EditSelection.Next

While Not pFeat Is Nothing
    pSketch.DrawText pFeat.ShapeCopy.Centroid, CStr(pFeat.OID)
    Set pFeat = pEditor.EditSelection.Next
Wend

pSketch.FinishDrawing

Python代码如下：

import arcpy

#获取Editor对象和选择集
editor = arcpy.Editor
selection = editor.selection()

#遍历选择集中的要素
with editor.startOperation():
    with arcpy.da.UpdateCursor(selection, ['OID@', 'SHAPE@XY']) as cursor:
        for row in cursor:
            nid = str(row[0])
            if nid.startswith('-'):
                nid = '_n' + nid[1:]
            elif nid == '0':
                nid = '_n'
            row[0] = nid
            cursor.updateRow(row)

这两份代码都会对符合条件的要素（如选择集中的要素）进行遍历，并依次给每个要素打上编号。其中VBScript通过IEditor3DDrawing和DrawText方法可以将编号渲染到地图上，而Python代码则通过arcpy.da.UpdateCursor和updateRow方法直接修改选择集中要素的属性表中的字段值。需要注意的是，以上两份代码是示意性的代码，具体实现中要根据数据集的实际情况进行相应的调整。