void IOrbitProjectionTransformControl.Free()
{
if (_orbitProjectionTransform != null)
{
_orbitProjectionTransform.Dispose();
_orbitProjectionTransform = null;
}
}
void BuildOrbitPrjTransoform(object sender, EventArgs e)
{
IRasterBand lonBand, latBand;
IRasterBand[] bs = _bandProvider.GetBands("Longitude");
if (bs == null)
{
return;
}
lonBand = bs[0];
bs = _bandProvider.GetBands("Latitude");
if (bs == null)
{
return;
}
latBand = bs[0];
float[] lonBuffer = null;
float[] latBuffer = null;
//
switch (lonBand.DataType)
{
case enumDataType.Float:
lonBuffer = new float[lonBand.Width * lonBand.Height];
latBuffer = new float[latBand.Width * latBand.Height];
fixed(float *lonPtr = lonBuffer, latPtr = latBuffer)
{
IntPtr lonIntPtr = new IntPtr(lonPtr);
IntPtr latIntPtr = new IntPtr(latPtr);
lonBand.Read(0, 0, lonBand.Width, lonBand.Height, lonIntPtr, enumDataType.Float, lonBand.Width, latBand.Height);
latBand.Read(0, 0, latBand.Width, latBand.Height, latIntPtr, enumDataType.Float, latBand.Width, latBand.Height);
}
break;
case enumDataType.Double:
double[] lonBufferDouble = new double[lonBand.Width * lonBand.Height];
double[] latBufferDouble = new double[latBand.Width * latBand.Height];
fixed(double *lonPtrd = lonBufferDouble, latPtrd = latBufferDouble)
{
IntPtr lonIntPtr = new IntPtr(lonPtrd);
IntPtr latIntPtr = new IntPtr(latPtrd);
lonBand.Read(0, 0, lonBand.Width, lonBand.Height, lonIntPtr, enumDataType.Double, lonBand.Width, latBand.Height);
latBand.Read(0, 0, latBand.Width, latBand.Height, latIntPtr, enumDataType.Double, latBand.Width, latBand.Height);
}
lonBuffer = new float[lonBand.Width * lonBand.Height];
latBuffer = new float[latBand.Width * latBand.Height];
for (int i = 0; i < lonBuffer.Length; i++)
{
lonBuffer[i] = (float)lonBufferDouble[i];
latBuffer[i] = (float)latBufferDouble[i];
}
break;
}
if (lonBuffer != null && latBuffer != null)
{
int lonsWidth = lonBand.Width;
int latsHeight = latBand.Height;
float[] retLonBuffer, retLatBuffer;
int retWidth, retHeight;
int sample = 4;//经纬度数据集缩小4倍
SampleMatrix(sample, lonBuffer, latBuffer, lonsWidth, latsHeight,
out retLonBuffer, out retLatBuffer, out retWidth, out retHeight);
_orbitProjectionTransform = new OrbitProjectionTransform(retLonBuffer, retLatBuffer,
new Size(retWidth, retHeight),
_width / retWidth);
}
}