GP工具可以較為簡單的實現柵格資料重分類，要注意引數設定準確。

重分類時要用到獲取柵格資料最大最小值，

等間距重分類：

步驟：

• 獲取柵格資料最大最小值
• 定義與初始化GP工具
• 定義重分類工具
• 重分類工具初始化
• 執行重分類
• 載入執行結果

獲取柵格資料最大最小值

//獲取取值範圍
IRaster pRaster = pRasterLayer.Raster;
IRasterBandCollection pRBC = (IRasterBandCollection)pRaster;
IRasterBand pRasterband = pRBC.Item(0);  //第一坡道
IRasterStatistics pRS = pRasterband.Statistics;
double max = pRS.Maximum;
double min = pRS.Minimum;
 

定義與初始化GP工具

Geoprocessor GP = new Geoprocessor();
GP.OverwriteOutput = true;

定義重分類工具

Reclassify pRec = new Reclassify();

重分類工具初始化

pRec.in_raster = pRasterLayer;
pRec.reclass_field = "Value";
string remap = "";
double dis = (max + min) / 10;
for(double i = 0; i < 10; i++)   //此處注意，一定要為double型別
    {
        //注意數字和數字一起算
        //注意字元跟字元一起算
        double from = min + dis * i/10;
        double to = min + dis * (i + 1)/10;
        remap += from + " " + to + " " + i + ";";
    }
pRec.remap = remap;
 

執行重分類、載入執行結果

            try
            {
                GP.Execute(pRec, null);

                IRasterLayer resRasterLayer = new RasterLayer();
                resRasterLayer.CreateFromFilePath(Application.StartupPath + "\\reclass.tif");
                axMapControl1.AddLayer(resRasterLayer);
                object sev = null;
                MessageBox.Show(GP.GetMessages(ref sev));
            }
            catch
            {
                object sev = null;
                MessageBox.Show(GP.GetMessages(ref sev));

            }
 

注意：

int型資料運算後會被取整，涉及小數運算時們一定要將資料定義為double或float

資料加減運算與字串加減要分開，防止混淆，無法執行。

全部程式碼（函式）：

        private void 重分類ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            //獲取輸入資料
            ILayer pLayer = axMapControl1.get_Layer(3);
            IRasterLayer pRasterLayer = pLayer as IRasterLayer;

            //獲取取值範圍
            IRaster pRaster = pRasterLayer.Raster;
            IRasterBandCollection pRBC = (IRasterBandCollection)pRaster;
            IRasterBand pRasterband = pRBC.Item(0);  //第一坡道
            IRasterStatistics pRS = pRasterband.Statistics;
            double max = pRS.Maximum;
            double min = pRS.Minimum;

            Geoprocessor GP = new Geoprocessor();
            GP.OverwriteOutput = true;

            //定義重分類工具
            Reclassify pRec = new Reclassify();
            pRec.in_raster = pRasterLayer;
            pRec.reclass_field = "Value";

            string remap = "";
            double dis = (max + min) / 10;
            for(double i = 0; i < 10; i++)   //此處注意，一定要為double型別
            {
                //注意數字和數字一起算
                //注意字元跟字元一起算
                double from = min + dis * i/10;
                double to = min + dis * (i + 1)/10;
                remap += from + " " + to + " " + i + ";";
            }
            pRec.remap = remap;
            MessageBox.Show(remap);
            pRec.out_raster = Application.StartupPath + "\\reclass.tif";

            try
            {
                GP.Execute(pRec, null);

                IRasterLayer resRasterLayer = new RasterLayer();
                resRasterLayer.CreateFromFilePath(Application.StartupPath + "\\reclass.tif");
                axMapControl1.AddLayer(resRasterLayer);
                object sev = null;
                MessageBox.Show(GP.GetMessages(ref sev));
            }
            catch
            {
                object sev = null;
                MessageBox.Show(GP.GetMessages(ref sev));

            }
        }