/// <summary>
/// Create an Erdas image file given specs
/// </summary>
public Image(string filename,
Dimensions dimensions,
int bandCount,
System.TypeCode bandType,
IMetadata metadata)
{
// if filename does not end in .gis or .lan throw exception
string extension = Path.GetExtension(filename).ToLower();
if (!(extension.Equals(".gis")) && !(extension.Equals(".lan")))
throw new ApplicationException("Erdas image must have either GIS or LAN as extension");
// if dimensions are messed up throw exception
if ((dimensions.Rows < 1) || (dimensions.Columns < 1))
throw new ApplicationException("Erdas image given invalid dimensions");
// if bandCount messed up throw exception
if ((bandCount < 1) || (bandCount > 0xffff))
throw new ApplicationException("Erdas image given invalid band count");
// more bandCount checking
if (extension.Equals(".gis"))
{
if (bandCount > 1)
throw new ApplicationException("Erdas GIS files cannot support multiband images");
}
this.imageHeader =
new ImageHeader(dimensions, bandType, bandCount, metadata);
this.imageHeader.Write(filename);
}
/// <summary>
/// Open an existing Erdas image file
/// </summary>
public Image(string filename)
{
// if filename does not end in .gis or .lan throw exception
string extension = Path.GetExtension(filename).ToLower();
if (!(extension.Equals(".gis")) && !(extension.Equals(".lan")))
throw new ApplicationException("Erdas file must have either GIS or LAN as extension");
this.imageHeader = new ImageHeader();
this.imageHeader.Read(filename);
}
