Load ArcGIS digitized image

问题

I am New to GIS platform.

In my project (A windows application) I'm trying to load an image in PictureBox(A drone image of an area) is in GeoTIFF format about 950+ MB's. This image digitized(mark boundries of every house and labelled with house no) and data imported in Shapefile. I extracted XY coordinate data using following code. I reduced the original image size to about 40-45 MB's and converted in JPG format.

Now I have to plot that XY coordinate data in my windows application on the new reduced image.

How should I achieve this scenario? What exactly should I do? I am not able to load the Original image about 950+ MB's?

Code For getting XY coordinates from Shapefile

private void ReadShapeFile(string path)
{
    ShapeFile.MapFilesInMemory = true;
    // open the shapefile
    EGIS.ShapeFileLib.ShapeFile sf = new EGIS.ShapeFileLib.ShapeFile(path);
    try
    {
        sf.RenderSettings = new EGIS.ShapeFileLib.RenderSettings(path, "", this.Font);
        EGIS.ShapeFileLib.DbfReader dbfr = sf.RenderSettings.DbfReader;
        using (System.IO.StreamWriter writer = new System.IO.StreamWriter("output.txt"))
        {
            EGIS.ShapeFileLib.ShapeFileEnumerator sfEnum = sf.GetShapeFileEnumerator();
            int recordIndex = 0;
            while (sfEnum.MoveNext())
            {
                string rec = "";
                string NoOfCord = "";
                string coord = "";
                rec = string.Format("Record:{0}", recordIndex);
                writer.WriteLine(string.Format("Record:{0}", recordIndex));
                System.Collections.ObjectModel.ReadOnlyCollection<PointD[]> pointRecords = sfEnum.Current;
                foreach (PointD[] pts in pointRecords)
                {
                    writer.Write(string.Format("[NumPoints:{0}]", pts.Length));
                    NoOfCord = string.Format("[NumPoints:{0}]", pts.Length);
                    for (int n = 0; n < pts.Length; ++n)
                    {
                        if (n > 0) writer.Write(',');
                        writer.Write(pts[n].ToString());
                        if (n > 0) coord += ",";
                        coord += pts[n].ToString();
                    }
                    writer.WriteLine();
                }
                AddDataToDataTable(recordIndex, rec, NoOfCord, coord);
                ++recordIndex;
            }
            sfEnum.Dispose();
        }
        MessageBox.Show("Data Loaded Successfully");
    }
    catch (Exception ex) { Debug.WriteLine("Error Message - " + enl + ex.Message + enl + "Error StackTrace - " + enl + ex.StackTrace + enl); }
    finally
    {
        sf.Close();
        sf.Dispose();
    }
}

回答1:

First: loading huge image needs pyramid or tile cutting; if you want your application to show the full image, please cut tile or build pyramid and then show it in mapcontrol which in the dotspatial or sharpmap libraries.

Second: if you have not cropped your images, the proccessed image would have the same real extent with original image. You can caculate the real position of any pixel in the image; you can also transform the real position (lat/lon or projection coordinate) to the image coordinate reference (which top-left is (0,0)).

来源：https://stackoverflow.com/questions/51627888/load-arcgis-digitized-image

标签

.net

winforms

gis

arcgis