edu.d.umn.fileformats
Class DDFFile

java.lang.Object
  edu.d.umn.fileformats.ElevationFile
      edu.d.umn.fileformats.DDFFileAbstract
          edu.d.umn.fileformats.DDFFile

public class DDFFile
extends DDFFileAbstract

DDFFile.java Created on July 1, 2005, 11:28 AM Extends ElevationFile to handle data from USGS SDTS transfers. These data files have a 4 number identifier followed by a word, and end in a ddf extension. Not all of the files from a transfer are necessary to build the model. The only ones this class currently uses is cel0.ddf, ddom.ddf, iden.ddf, and ldef.ddf. Many thanks to Bill Allen and his very helpful website www.3dartist.com/WP/sdts/sdtsnotes.htm for decoding the ddf files.

Field Summary

Fields inherited from class edu.d.umn.fileformats.DDFFileAbstract

fileID, lengthOfFirstDirectoryElement, lengthOfLastDirectoryElement, lengthOfNextDirectoryElement, numDirectoryElements, startingPointOfDDA

Fields inherited from class edu.d.umn.fileformats.ElevationFile

elevations, fileName, filePath, groundCoordinates, maxElevation, minElevation, nColumns, nRows, quadrangleName, resolution

Constructor Summary

protected	DDFFile()
	DDFFile(java.lang.String aFileName) Constructs a new DDFFile.

Method Summary

protected void	findElevations() Parses the elevation data out of the cel0 file.
protected void	findRowColMax()

Methods inherited from class edu.d.umn.fileformats.DDFFileAbstract

processElevations, processGroundCoordinates, processLeader, processMinMaxElevation, processRowColMax

Methods inherited from class edu.d.umn.fileformats.ElevationFile

getResolution

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DDFFile

protected DDFFile()

DDFFile

public DDFFile(java.lang.String aFileName)

Constructs a new DDFFile.

Parameters:

aFileName - Should be the full path to the file.

Method Detail

findElevations

protected void findElevations()
                       throws java.io.IOException

Parses the elevation data out of the cel0 file. Currently not as robust as I would like. Two important assumptions are made. 1. The data records all come in the same format. 2. The elevations are recorded in two byte signed integers. CAUTION! If an integer should fall outside of the minimum and maximum elevations, it is discarded.

Throws:

java.io.IOException

findRowColMax

protected void findRowColMax()
                      throws java.net.MalformedURLException,
                             java.io.IOException

Throws:

java.net.MalformedURLException

java.io.IOException