ilog.views.maps.raster

Class IlvRasterAltitudeDataSource

java.lang.Object

ilog.views.maps.IlvFeatureAttribute

ilog.views.maps.raster.IlvRasterAltitudeDataSource

All Implemented Interfaces:

IlvPersistentObject, IlvAltitudeDataSource, Serializable

public class IlvRasterAltitudeDataSource
extends IlvFeatureAttribute
implements IlvAltitudeDataSource

IlvRasterAltitudeDataSource represents a raster altitude data source. This class is used to compute the pixel index for a specified latitude and longitude. It then interpolate the raster data associated with a raster reader to retrieve an altitude. The latitude/longitude to pixel mechanism is the same as the one used for the pixel on demand feature. An interpolation is done using the distance to the pixel center and the altitude of the surrounding points.

Since:

JViews 7.5

See Also:

Serialized Form

Field Summary

Fields inherited from interface ilog.views.maps.IlvAltitudeDataSource

NAME

Constructor Summary

Constructors

Constructor and Description
IlvRasterAltitudeDataSource(IlvInputStream stream) Constructs a raster altitude data source by reading serialized data.
IlvRasterAltitudeDataSource(IlvRasterAbstractReader reader, int imageIndex) The default constructor.

Method Summary

Modifier and Type	Method and Description
IlvFeatureAttribute	copy() Creates a new altitude data source by copying the parameters of this current instance.
double	getAltitude(double xlon, double ylat, double precision) This method interpolates the raster altitude data to return the altitude in a latitudinal and longitudinal coordinate system.
void	write(IlvOutputStream stream) Writes the object to an IlvOutputStream object.

Methods inherited from class java.lang.Object

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

Constructor Detail

IlvRasterAltitudeDataSource

public IlvRasterAltitudeDataSource(IlvInputStream stream)
                            throws IlvReadFileException

Constructs a raster altitude data source by reading serialized data.

Parameters:

stream - The stream to read from.

Throws:

IlvReadFileException - if there is a problem reading from stream.

IlvRasterAltitudeDataSource

public IlvRasterAltitudeDataSource(IlvRasterAbstractReader reader,
                                   int imageIndex)

The default constructor.

Parameters:

reader - A reader that is able to return interpolated altitude data.

imageIndex - The index of the image in that raster reader.

Method Detail

getAltitude

public double getAltitude(double xlon,
                          double ylat,
                          double precision)

This method interpolates the raster altitude data to return the altitude in a latitudinal and longitudinal coordinate system.

Specified by:

getAltitude in interface IlvAltitudeDataSource

Parameters:

xlon - The x parameter.

ylat - The y parameter.

precision - The precision.

Returns:

The altitude of this point. If there is no altitude for the specified point, a NaN is returned.

See Also:

IlvRasterProperties.getInterpolatedIntPixel(IlvCoordinate, IlvRasterMappedBuffer), IlvAltitudeDataSource.getAltitude(double, double, double)

write

public void write(IlvOutputStream stream)
           throws IOException

Writes the object to an IlvOutputStream object.

Specified by:

write in interface IlvPersistentObject

Overrides:

write in class IlvFeatureAttribute

Parameters:

stream - The output stream

Throws:

IOException - thrown when an exception occurs during the write operation for this object.

See Also:

IlvPersistentObject.write(ilog.views.io.IlvOutputStream)

copy

public IlvFeatureAttribute copy()

Creates a new altitude data source by copying the parameters of this current instance.

Note: the raster data is not duplicated.

Specified by:

copy in class IlvFeatureAttribute

Returns:

a copy of this IlvFeatureAttribute.

See Also:

IlvFeatureAttribute.copy()