<转> 在ArcGIS属性表中增加需要的字段,并自动赋值

在ArcGIS属性表中,一般不会包含实体几何信息,可以采取VBA进行计算。下面是几个简单的代码(转载自集思学院)
特点:
1推荐给不会使用AO的朋友
2可以保存为CAL文件以备下次方便使用

使用方法
1打开属性表,选择计算的字段,右点选择Calculate Values;
2.选择“是”,进入Field Calculator;
2选择Advance选项;
3 在Pre-Logic VBA Script Code编辑框中输入VBA代码;
4在下面编辑框中输入赋值部分.


1--点坐标X
VBA部分:
Dim pGeo As IGeometry
Set pGeo = [Shape]
Dim pPoint As IPoint
Set pPoint = pGeo
赋值部分:
pPoint.X

2--点坐标Y
VBA部分:
同上
赋值部分:
pPoint.Y

坐标值为文件存储的固有值,和是否使用On the Fly坐标表示无关。返回当前显示的坐标值参看8,9

3--多边形周长
VBA部分:
Dim pGeo As IGeometry
Set pGeo = [Shape]
Dim pPolygon As IPolygon
Set pPolygon = pGeo
赋值部分:
pPolygon.Length

4--多边形面积
VBA部分:
Dim pGeo As IGeometry
Set pGeo = [Shape]
Dim pPolygon As IPolygon
Set pPolygon = pGeo
Dim pArea As IArea
Set pArea = pPolygon
赋值部分:
pArea.Area

5--多边形重心X
VBA部分:
Dim pGeo As IGeometry
Set pGeo = [Shape]
Dim pPolygon As IPolygon
Set pPolygon = pGeo
Dim pArea As IArea
Set pArea = pPolygon
Dim pPoint As IPoint
Set pPoint = pArea.Centroid
赋值部分:
pPoint.X

6--多边形重心Y
VBA部分:
同上
赋值部分:
pPoint.Y

7--Polyline长度
VBA部分:
Dim pGeo As IGeometry
Set pGeo = [Shape]
Dim pPolyline As IPolyline
Set pPolyline = pGeo
Dim pCurve As IPolycurve
Set pCurve = pPolyline
赋值部分:
pCurve.Length

8--表示点坐标X
VBA部分:
Dim pDoc As IMxDocument
Set pDoc = ThisDocument
Dim pSpRef As ISpatialReference
Set pSpRef = pDoc.FocusMap.SpatialReference

Dim pClone As IClone
Set pClone = [Shape]
Dim pGeo As IGeometry
Set pGeo = pClone.Clone
Dim pPoint as IPoint
Set pPoint = pGeo

pGeo.Project pSpRef
赋值部分:
pPoint.X

9--表示点坐标Y
VBA部分:
同上
赋值部分:
pPoint.Y

坐标值为On the Fly显示的坐标,不是文件存储的固有坐标

10--连续编号
VBA部分:
Static lCount as long
lCount=lCount+1
赋值部分:
lCount (从1开始)
lCount-1 (从0开始)
posted @ 2007-07-12 12:21  天下无霜  阅读(4317)  评论(0编辑  收藏  举报