no.kartverket.data.dtm

Class DTMGrid

java.lang.Object

no.kartverket.data.dtm.DTMGrid

public class DTMGrid
extends java.lang.Object

A terrain model implemented as a regular grid, positioned and oriented to a geographical position

Field Summary

Fields

Modifier and Type	Field and Description
(package private) java.nio.FloatBuffer	arrH All heights, line by line, from upper left.
private long	cols
private double	cosAngle
private static int[]	neighCellIx
private OriginData	origin
private long	rows
private double	sinAngle
private double	space
private double	ul_lat
private double	ul_lon
private double	ul_x
private double	ul_y

Constructor Summary

Constructors

Constructor and Description
DTMGrid(int rows, int cols) Create grid and allocate data

Method Summary

Modifier and Type	Method and Description
long	getCols()
double	getInterpolatedAltitude(double lat, double lng) Compute interpolated value for a position
long	getRows()
float[]	getSurfacePlane(float x, float y, float z) Compute plane equation for the closest point in a DTM surface.
float	gridToWorldX(float x_grid, float y_grid)
float	gridToWorldY(float x_grid, float y_grid)
float	gridValue(int x_i, int y_i) Find value of a grid cell
(package private) void	setCoordinateParams(double upperLeftN, double upperLeftE, double space) Set grid position (given in UTM33/ETRS89) and compute geodetic data
void	setOrigin(OriginData origin)
float	worldToGridX(float x_grid, float y_grid)
float	worldToGridY(float x_grid, float y_grid)

Methods inherited from class java.lang.Object

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

Field Detail

rows

private long rows

cols

private long cols

arrH

java.nio.FloatBuffer arrH

All heights, line by line, from upper left.

ul_lat

private double ul_lat

ul_lon

private double ul_lon

ul_x

private double ul_x

ul_y

private double ul_y

cosAngle

private double cosAngle

sinAngle

private double sinAngle

space

private double space

origin

private OriginData origin

neighCellIx

private static int[] neighCellIx

Constructor Detail

DTMGrid

DTMGrid(int rows,
        int cols)

Create grid and allocate data

Parameters:

rows - Number of rows

cols - Number of columns

Method Detail

setCoordinateParams

void setCoordinateParams(double upperLeftN,
                         double upperLeftE,
                         double space)

Set grid position (given in UTM33/ETRS89) and compute geodetic data

Parameters:

upperLeftN - northing position of upper left corner

upperLeftE - easting position of upper left corner

space - horizontal spacing of grid

setOrigin

public void setOrigin(OriginData origin)

gridValue

public float gridValue(int x_i,
                       int y_i)

Find value of a grid cell

Parameters:

x_i - column index

y_i - row index

Returns:

getInterpolatedAltitude

public double getInterpolatedAltitude(double lat,
                                      double lng)

Compute interpolated value for a position

Parameters:

lat - latitude of position

lng - longitude of position

Returns:

height value

getSurfacePlane

public float[] getSurfacePlane(float x,
                               float y,
                               float z)

Compute plane equation for the closest point in a DTM surface.

Parameters:

x - coordiante of point

y - coordiante of point

z - coordiante of point

Returns:

plane equation as given in Triangle.pointTriangle(float[], float[], float[], float[], float[])

gridToWorldX

public float gridToWorldX(float x_grid,
                          float y_grid)

gridToWorldY

public float gridToWorldY(float x_grid,
                          float y_grid)

worldToGridX

public float worldToGridX(float x_grid,
                          float y_grid)

worldToGridY

public float worldToGridY(float x_grid,
                          float y_grid)

getRows

public long getRows()

getCols

public long getCols()