Specifies a uniform grid of elevation values within some spatial reference frame. More...
#include <Inventor/geo/SoGeoElevationGrid.h>
Public Member Functions | |
virtual SoType | getTypeId () const |
SoGeoElevationGrid () | |
Static Public Member Functions | |
static SoType | getClassTypeId () |
Public Attributes | |
SoSFFloat | yScale |
SoSFVec3f | geoGridOrigin |
SoMFString | geoSystem |
SoMFFloat | height |
SoSFInt32 | xDimension |
SoSFFloat | xSpacing |
SoSFInt32 | zDimension |
SoSFFloat | zSpacing |
The SoGeoElevationGrid allows to create terrain models for local or large areas (automatically introduces correct degree of earth curvature).
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 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. 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.
yScale | 1.0 |
geoGridOrigin | 0 0 0 |
geoSystem | ["GD","WE"] |
height | [] |
xDimension | 0 |
xSpacing | 1.0 |
zDimension | 0 |
zSpacing | 1.0 |
SoGeoElevationGrid::SoGeoElevationGrid | ( | ) |
Constructor.
static SoType SoGeoElevationGrid::getClassTypeId | ( | ) | [static] |
Returns the type identifier for this class.
Reimplemented from SoIndexedFaceSet.
virtual SoType SoGeoElevationGrid::getTypeId | ( | ) | const [virtual] |
Returns the type identifier for this specific instance.
Reimplemented from SoIndexedFaceSet.
Specifies the geographic coordinate for the south-west corner (bottom-left) of the dataset.
Defines the spatial reference frame.
Valid values are:
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.
Number of X values in the grid.
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.
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.
Number of Z values in the grid.
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.