/* Constructs 'DataMapper' with DTED file data */
public DataMapper(DTED_Data data)
{
fileData = data;
}
/*
* Function will read and parse the '*.dt1' file and
* populate the 'DTED_buffer' parameter passed.
*/
public void read(out DTED_Data dtedData)
{
BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open));
// Declare variables to store token buffer
string result;
string lonInterval;
string latInterval;
int numLat;
int numLon;
int[][] elevGrid; // Create array of arrays where each element contains a page of each data record
// Skip bytes to origin buffer
reader.BaseStream.Seek((FileConstants.SIZE_UHL_RECOGNITION_SENTINEL +
FileConstants.SIZE_SKIP), SeekOrigin.Current);
// Read Longitude Origin
buffer = reader.ReadBytes(FileConstants.SIZE_LONGITUDE_ORIGIN);
result = Encoding.ASCII.GetString(buffer);
// Now parse the resulting 'string' into the components of longitude
Longitude lonOrigin = new
Longitude(result.Substring(FileConstants.LOC_UHL_DEG, FileConstants.SIZE_UHL_DEG),
result.Substring(FileConstants.LOC_UHL_MIN, FileConstants.SIZE_UHL_MIN),
result.Substring(FileConstants.LOC_UHL_SEC, FileConstants.SIZE_UHL_SEC),
result.Substring(FileConstants.LOC_UHL_DIRECTION, FileConstants.SIZE_UHL_DIRECTION));
// Read Latitude Origin
buffer = reader.ReadBytes(FileConstants.SIZE_LATITUDE_ORIGIN);
result = Encoding.ASCII.GetString(buffer);
// Now parse the resulting 'string' into the components of latitude
Latitude latOrigin = new
Latitude(result.Substring(FileConstants.LOC_UHL_DEG, FileConstants.SIZE_UHL_DEG),
result.Substring(FileConstants.LOC_UHL_MIN, FileConstants.SIZE_UHL_MIN),
result.Substring(FileConstants.LOC_UHL_SEC, FileConstants.SIZE_UHL_SEC),
result.Substring(FileConstants.LOC_UHL_DIRECTION, FileConstants.SIZE_UHL_DIRECTION));
// Read Longitude Interval
buffer = reader.ReadBytes(FileConstants.SIZE_LONGITUDE_INTERVAL);
lonInterval = Encoding.ASCII.GetString(buffer).Insert(FileConstants.LOC_UHL_INTERVAL_DECIMAL,
"."); // Insert decimal point at 3rd element as specified in docuement
// Read Latitude Interval
buffer = reader.ReadBytes(FileConstants.SIZE_LATITUDE_INTERVAL);
latInterval = Encoding.ASCII.GetString(buffer).Insert(FileConstants.LOC_UHL_INTERVAL_DECIMAL,
"."); // Insert decimal point at 3rd element as specified in docuement
// Skip past tokens that are NOT needed
reader.BaseStream.Seek((FileConstants.SIZE_ABSOLUTE_VERTICAL_ACC +
FileConstants.SIZE_UNCLASSIFIED_SECURITY +
FileConstants.SIZE_UNIQUE_REFERENCE), SeekOrigin.Current);
// Read Number of Latitude
buffer = reader.ReadBytes(FileConstants.SIZE_NUMBER_LONGITUDE);
numLon = int.Parse(Encoding.ASCII.GetString(buffer));
// Read Number of Longitude
buffer = reader.ReadBytes(FileConstants.SIZE_NUMBER_LATITUDE);
numLat = int.Parse(Encoding.ASCII.GetString(buffer));
elevGrid = new int[numLon][]; // Allocate 'elevData' based on size of latitude and longitude amount
// Skip the rest of the UHL header file
reader.BaseStream.Seek((FileConstants.SIZE_MULTIPLE_ACC + FileConstants.SIZE_RESERVED),
SeekOrigin.Current);
UHL_Header header = new UHL_Header(lonOrigin, latOrigin, lonInterval,
latInterval, numLat, numLon); // Header is fully read initialize the object
// Reader is now at start of DSI part of the file
reader.BaseStream.Seek(FileConstants.SIZE_DSI, SeekOrigin.Current); // Skip DSI
// Reader is now at start of ACC part of the file
reader.BaseStream.Seek(FileConstants.SIZE_ACC, SeekOrigin.Current); // Skip ACC
// Reader is now at the start of the 'buffer Record(s)'
Array.Resize(ref buffer, FileConstants.SIZE_DATA_REC); // Must resize buffer to hold at least one data record
int numBytesRead;
int recordNum = 0;
numBytesRead = reader.Read(buffer, 0, FileConstants.SIZE_DATA_REC);
while (numBytesRead == FileConstants.SIZE_DATA_REC) // Check if number of bytes read was successful
{
elevGrid[recordNum] = parseDataRecord(buffer);
numBytesRead = reader.Read(buffer, 0, FileConstants.SIZE_DATA_REC);
++recordNum;
}
dtedData = new DTED_Data(header, elevGrid); // Assign paramter to newly constructed data
reader.Close(); // Close file stream
}
