如何将像素坐标转为地图坐标（转载）

最新推荐文章于 2025-08-13 15:11:26 发布

转载最新推荐文章于 2025-08-13 15:11:26 发布 · 947 阅读

本文介绍了一种方法，用于将地图上的像素单位转换为实际地理单位，这在地理信息系统中非常有用。通过获取活动视图、屏幕显示、设备帧等信息，并计算地图可见区域的实际宽度，最终可以得到每个像素所代表的地理单位长度。

public System.Double ConvertPixelsToMapUnits(ESRI.ArcGIS.Carto.IActiveView activeView, System.Int32 pixelUnits)
{

if(activeView == null)
{
return -1;
}
//Get the ScreenDisplay
ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = activeView.ScreenDisplay;

//Get the DisplayTransformation
ESRI.ArcGIS.Display.IDisplayTransformation displayTransformation = screenDisplay.DisplayTransformation;

//Get the device frame which will give us the number of pixels in the X direction
ESRI.ArcGIS.Display.tagRECT deviceRECT = displayTransformation.get_DeviceFrame();
System.Int32 pixelExtent = (deviceRECT.right - deviceRECT.left);

//Get the map extent of the currently visible area
ESRI.ArcGIS.Geometry.IEnvelope envelope = displayTransformation.VisibleBounds;
System.Double realWorldDisplayExtent = envelope.Width;

//Calculate the size of one pixel
if(pixelExtent == 0)
{
return -1;
}
System.Double sizeOfOnePixel = (realWorldDisplayExtent / pixelExtent);

//Multiply this by the input argument to get the result
return (pixelUnits * sizeOfOnePixel);
}