获取ArcGIS功能的“度量比例”

Question

我有一组要重新投影的要素类，其中一些具有度量。要在重新投影的要素中复制度量，我必须在投影之前找到要素的度量比例（某些要素类具有以千米为单位的度量）。

当我尝试测量比例时，它不够准确：

public static double measuresScaleFactor(IFeature pFeat, int iShpLenFld, out string sError)
{
    // Get the scale factor of the feature measures assuming it has measures assigned
    sError = "";
    double dScale = 1;
    IMSegmentation4 pSeg = null;
    double dMax;
    double dLength;

    try
    {
        if (pFeat.Shape != null && pFeat.Shape.IsEmpty == false )
        {
            pSeg = (IMSegmentation4)pFeat.Shape;
            dMax = pSeg.MMax;
            dLength = (double)pFeat.Value[iShpLenFld];
            dScale = dMax / dLength;
        }

        return dScale;
    }
    catch (Exception ex)
    {
        System.Diagnostics.StackTrace pStack = new System.Diagnostics.StackTrace(ex, true);
        System.Diagnostics.StackFrame pFrame = pStack.GetFrame(pStack.FrameCount - 1);
        int iLineNo = pFrame.GetFileLineNumber();
        sError = "Error: measuresScaleFactor; Line: " + iLineNo + " \r\n" + ex.Message;
        return dScale;
    }
}

对于测试运行，dLength的值为745m，dMax为.741km。如果pFeat是一条多段线，并且部分重复了这些措施，那么也会出现问题。

有人能告诉我arcObjects中是否有一个包含比例因子（精确）值的细分信息接口？

谢谢

J