visad.data.gis

Class UsgsDemAdapter

java.lang.Object

visad.data.gis.UsgsDemAdapter

public class UsgsDemAdapter
extends java.lang.Object

UsgsDemAdapter converts the data in a USGS DEM file to a VisAD object. The specification for * the format can be found at http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/dem/2DEM0198.PDF. Refer to this document for further explanation of the data elements of a DEM.

To simplify things, class UsgsDem changes the format of a USGS 7.5 minute DEM to a simpler "row by column" raster form rather than the "row by column by subcolumn" format in the specification.

Constructor Summary

Constructors

Constructor and Description
UsgsDemAdapter() Default constructor, everything remains null.
UsgsDemAdapter(java.lang.String filename) Constructs a new UsgsDemAdapter object with data read from the given (native format, non-SDTS) USGS DEM file

Method Summary

Modifier and Type	Method and Description
FieldImpl	getData() Get the DEM as a VisAD data object
Gridded2DSet	getDomain() Get the domain set for this DEM
void	load(java.lang.String filename) Reinitializes this UsgsDemAdapter object with data read from the given (non-SDTS) USGS DEM file.
static void	main(java.lang.String[] args)
static java.lang.String	padRight(java.lang.Object obj, int i) This method takes any Object and using its String representation provided by its toString() method, pads it with blank characters on the right, to a specified length.
java.lang.String	toString() Multi-line string representation

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

UsgsDemAdapter

public UsgsDemAdapter()

Default constructor, everything remains null. Call load() to load a file.

UsgsDemAdapter

public UsgsDemAdapter(java.lang.String filename)
               throws java.io.IOException,
                      VisADException

Constructs a new UsgsDemAdapter object with data read from the given (native format, non-SDTS) USGS DEM file

Parameters:

filename - the name of the DEM file

Throws:

java.io.IOException

VisADException

Method Detail

load

public void load(java.lang.String filename)
          throws java.io.IOException,
                 VisADException

Reinitializes this UsgsDemAdapter object with data read from the given (non-SDTS) USGS DEM file.

Parameters:

filename - the name of the DEM file

Throws:

java.io.IOException - - If an I/O error occurs (invalid file)

VisADException

toString

public java.lang.String toString()

Multi-line string representation

Overrides:

toString in class java.lang.Object

Returns:

An info string suitable for printing to the console.

padRight

public static java.lang.String padRight(java.lang.Object obj,
                                        int i)

This method takes any Object and using its String representation provided by its toString() method, pads it with blank characters on the right, to a specified length.

Parameters:

obj - Object to be padded

i - padding length

getData

public FieldImpl getData()
                  throws VisADException

Get the DEM as a VisAD data object

Returns:

a FlatField of type ((x,y) -> altitude) where x,y is either (Longitude, Latitude) or (EASTING, NORTHING)

Throws:

VisADException

getDomain

public Gridded2DSet getDomain()
                       throws VisADException

Get the domain set for this DEM

Returns:

Gridded2DSet for domain

Throws:

VisADException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception