/// <summary>
/// This converts this object into a raster defined by the specified window dimensions.
/// </summary>
/// <param name="filename">The string filename to open</param>
/// <param name="startRow">The integer row index to become the first row to load into this raster.</param>
/// <param name="endRow">The 0 based integer row index to become the last row included in this raster.</param>
/// <param name="startColumn">The 0 based integer column index for the first column of the raster.</param>
/// <param name="endColumn">The 0 based integer column index for the last column to include in this raster.</param>
/// <param name="inRam">Boolean. If this is true and the window is small enough, this will load the window into ram.</param>
public virtual void OpenWindow(string filename, int startRow, int endRow, int startColumn, int endColumn,
bool inRam)
{
Filename = filename;
ReadHeader(filename);
NumRows = endRow - startRow + 1;
NumColumns = endColumn - startColumn + 1;
StartColumn = startColumn;
StartRow = startRow;
EndColumn = endColumn;
EndRow = EndRow;
// Reposition the "raster" so that it matches the window, not the whole raster
// X = [0] + [1] * column + [2] * row;
// Y = [3] + [4] * column + [5] * row;
// Translation only needs to change two coefficients
Bounds.AffineCoefficients[0] = Bounds.AffineCoefficients[0] + Bounds.AffineCoefficients[1]*startColumn +
Bounds.AffineCoefficients[2]*startRow;
Bounds.AffineCoefficients[3] = Bounds.AffineCoefficients[3] + Bounds.AffineCoefficients[4]*startColumn +
Bounds.AffineCoefficients[5]*startRow;
if (inRam)
{
if (NumRows*NumColumns < 64000000)
{
IsInRam = true;
Read();
}
}
Value = new FloatValueGrid(this);
}
/// <summary>
/// Calls the basic setup for the raster
/// </summary>
protected void Initialize()
{
StartRow = 0;
EndRow = NumRows- 1;
StartColumn = 0;
EndColumn = NumColumns-1;
NumColumnsInFile = NumColumns;
NumRowsInFile = NumRows;
// Just set the cell size to one
Bounds = new RasterBounds(NumRows, NumColumns, new[]{ 0.5, 1.0, 0.0, NumRows - .5, 0.0, -1.0 });
NumValueCells = 0;
_floatNoDataValue = int.MinValue;// sets the no-data value to the minimum value for the specified type.
if (IsInRam)
{
Data = new float[NumRows][];
for (int row = 0; row < NumRows; row++)
{
Data[row] = new float[NumColumns];
}
}
Value = new FloatValueGrid(this);
_floatNoDataValue = float.MinValue; // Sets it to the appropriate minimum for the int datatype
}
/// <summary>
/// Opens a new instance of the BinaryRaster
/// </summary>
/// <param name="filename">The string filename of the raster to open</param>
/// <param name="inRam">Boolean, if true this will attempt to load all the values into memory</param>
public virtual void Open(string filename, bool inRam)
{
Filename = filename;
ReadHeader(filename);
if (inRam)
{
if (NumRowsInFile*NumColumnsInFile < 64000000)
{
IsInRam = true;
Read();
}
}
Value = new FloatValueGrid(this);
}
