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其實不只是焦點統計 鄰域分析包含的統計，這段代碼都可以改造
/// <summary>
/// 焦點統計：矩形鄰域分析
/// </summary>
/// <param name="geoDataset">輸入</param>
/// <param name="width">鄰域設定：寬度</param>
/// <param name="height">鄰域設定：高度</param>
/// <param name="unitsType">單位：像元 地圖（二選一）</param>
/// <param name="statisticsType">統計型別</param>
/// <returns>IGeoDataset</returns>
public IGeoDataset FocalStatistics(IGeoDataset geoDataset, double width, double height, esriGeoAnalysisUnitsEnum unitsType, esriGeoAnalysisStatisticsEnum statisticsType)
{
IRasterNeighborhood rasterNeighborhood = new RasterNeighborhoodClass();
rasterNeighborhood.SetRectangle(width, height, unitsType);//這里可選方法很多： 可以是矩形 圓形、環狀、扇形、及其他高級形狀（可查相關資料）
INeighborhoodOp neighborhoodOp = new RasterNeighborhoodOpClass();
IGeoDataset geoDataset_result = neighborhoodOp.FocalStatistics(geoDataset, statisticsType, rasterNeighborhood, true);
return geoDataset_result;//輸出
}
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