com.openinventor.inventor.geo

Class SoGeoElevationGrid

java.lang.Object

com.openinventor.inventor.Inventor

com.openinventor.inventor.misc.SoBase

com.openinventor.inventor.fields.SoFieldContainer

com.openinventor.inventor.nodes.SoNode

com.openinventor.inventor.nodes.SoShape

com.openinventor.inventor.nodes.SoVertexShape

com.openinventor.inventor.nodes.SoIndexedShape

com.openinventor.inventor.nodes.SoIndexedFaceSet

com.openinventor.inventor.geo.SoGeoElevationGrid

All Implemented Interfaces:

SafeDisposable

public class SoGeoElevationGrid
extends SoIndexedFaceSet

Specifies a uniform grid of elevation values within some spatial reference frame. The SoGeoElevationGrid allows to create terrain models for local or large areas (automatically introduces correct degree of earth curvature).

VRML X3D SPECIFICATION

This section describes the expected behavior of the node in a conforming X3D / VRML97 browser application. In some cases, the application is responsible for implementing portions of the expected behavior. Open Inventor viewer classes and IVF classes implement some of the application behaviors.

This section may reference portions of the X3D specification that are not present in this help file. The complete X3D spec is available at http://www.web3d.org.

The SoGeoElevationGrid node specifies a uniform grid of elevation values within some spatial reference frame. These are then transparently transformed into a geocentric, curved-earth representation. For example, this would allow a geographer to create a height field where all coordinates are specified in terms of latitude, longitude, and elevation. The geoSystem field is used to define the spatial reference frame and is described in 25.2.3 Specifying a spatial reference frame. The geoGridOrigin field specifies the geographic coordinate for the south-west corner (bottom-left) of the dataset. This value should be specified as described in 25.2.4 Specifying geospatial coordinates. The height array contains xDimensionzDimension floating point values that represent elevation above the ellipsoid or the geoid, as appropriate. These values are given in row-major order from west to east, south to north. When the geoSystem is "GD", xSpacing refers to the number of degrees of longitude between adjacent height values and zSpacing refers to the number of degrees of latitude between vertical height values. When the geoSystem is "UTM", xSpacing refers to the number of eastings (meters) between adjacent height values and zSpacing refers to the number of northings (meters) between vertical height values. EXAMPLE If xDimension = n and the grid spans d units horizontally, the xSpacing value should be set to: d / (n-1). The yScale value can be used to produce a vertical exaggeration of the data when it is displayed. By default, this value is 1.0 (no exaggeration). If this value is set greater than 1.0, all heights will appear larger than actual.

File format/default:

GeoElevationGrid {

yScale	1.0
geoGridOrigin	0 0 0
geoSystem	["GD","WE"]
height	[]
xDimension	0
xSpacing	1.0
zDimension	0
zSpacing	1.0

}

Action behavior:

SoGLRenderAction

Nested Class Summary

Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoShape

SoShape.ShapeTypes

Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor

Inventor.ConstructorCommand

Field Summary

Fields

Modifier and Type	Field and Description
SoSFVec3f	geoGridOrigin Specifies the geographic coordinate for the south-west corner (bottom-left) of the dataset.
SoMFString	geoSystem Defines the spatial reference frame.
SoMFFloat	height The height array contains xDimension * zDimension floating point values that represent elevation above the ellipsoid or the geoid, as appropriate.
SoSFInt32	xDimension Number of X values in the grid.
SoSFFloat	xSpacing Spacing between X values.
SoSFFloat	yScale The yScale value can be used to produce a vertical exaggeration of the data when it is displayed.
SoSFInt32	zDimension Number of Z values in the grid.
SoSFFloat	zSpacing Spacing between Z values.

Fields inherited from class com.openinventor.inventor.nodes.SoIndexedFaceSet

SO_END_FACE_INDEX

Fields inherited from class com.openinventor.inventor.nodes.SoIndexedShape

coordIndex, materialIndex, normalIndex, textureCoordIndex

Fields inherited from class com.openinventor.inventor.nodes.SoVertexShape

vertexProperty

Fields inherited from class com.openinventor.inventor.nodes.SoShape

boundingBoxIgnoring, LINES, POINTS, POLYGONS, TEXT

Fields inherited from class com.openinventor.inventor.Inventor

VERBOSE_LEVEL, ZeroHandle

Constructor Summary

Constructors

Constructor and Description
SoGeoElevationGrid() Constructor.

Method Summary

Methods inherited from class com.openinventor.inventor.nodes.SoVertexShape

getNormalCache

Methods inherited from class com.openinventor.inventor.nodes.SoShape

getShapeType, isPrimitiveRestartAvailable, isPrimitiveRestartAvailable

Methods inherited from class com.openinventor.inventor.nodes.SoNode

affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write

Methods inherited from class com.openinventor.inventor.fields.SoFieldContainer

copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults

Methods inherited from class com.openinventor.inventor.misc.SoBase

dispose, getEXTERNPROTO, getName, getPROTO, isDisposable, isSynchronizable, setName, setSynchronizable

Methods inherited from class com.openinventor.inventor.Inventor

getAddress, getNativeResourceHandle, startInternalThreads, stopInternalThreads

Methods inherited from class java.lang.Object

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

Field Detail

yScale

public final SoSFFloat yScale

The yScale value can be used to produce a vertical exaggeration of the data when it is displayed. By default, this value is 1.0 (no exaggeration). If this value is set greater than 1.0, all heights will appear larger than actual.

geoGridOrigin

public final SoSFVec3f geoGridOrigin

Specifies the geographic coordinate for the south-west corner (bottom-left) of the dataset.

geoSystem

public final SoMFString geoSystem

Defines the spatial reference frame.
Valid values are:

• GC: Earth-fixed Geocentric with respect to the WGS84 ellipsoid.
• GD: Geodetic spatial reference frame.
  An optional second string may be used to specify the ellipsoid using one of the ellipsoid codes that are defined in X3D. If no ellipsoid is specified, then "WE" is assumed (the WGS84 ellipsoid).
• UTM: Universal Transverse Mercator
  One further required argument must be supplied for UTM in order to specify the zone number (1..60). This is given in the form "Zn", where n is the zone number. An optional argument of "S" may be supplied in order to specify that the coordinates are in the southern hemisphere (otherwise, northern hemisphere will be assumed).

height

public final SoMFFloat height

The height array contains xDimension * zDimension floating point values that represent elevation above the ellipsoid or the geoid, as appropriate. These values are given in row-major order from west to east, south to north.

xDimension

public final SoSFInt32 xDimension

Number of X values in the grid.

xSpacing

public final SoSFFloat xSpacing

Spacing between X values.
When the geoSystem is "GD", xSpacing refers to the number of degrees of longitude between adjacent height values. When the geoSystem is "UTM", xSpacing refers to the number of eastings (meters) between adjacent height values.

zDimension

public final SoSFInt32 zDimension

Number of Z values in the grid.

zSpacing

public final SoSFFloat zSpacing

Spacing between Z values.
When the geoSystem is "GD", zSpacing refers to the number of degrees of latitude between vertical height values. When the geoSystem is "UTM", zSpacing refers to the number of northings (meters) between vertical height values.

Constructor Detail

SoGeoElevationGrid

public SoGeoElevationGrid()

Constructor.