bool
ElevationQuery::getElevationImpl(const GeoPoint& point,
float& out_elevation,
double desiredResolution,
double* out_actualResolution)
{
// assertion.
if ( !point.isAbsolute() )
{
OE_WARN << LC << "Assertion failure; input must be absolute" << std::endl;
return false;
}
osg::Timer_t begin = osg::Timer::instance()->tick();
// first try the terrain patches.
if ( _terrainModelLayers.size() > 0 )
{
osgUtil::IntersectionVisitor iv;
if ( _ivrc.valid() )
iv.setReadCallback(_ivrc.get());
for(LayerVector::iterator i = _terrainModelLayers.begin(); i != _terrainModelLayers.end(); ++i)
{
// find the scene graph for this layer:
Layer* layer = i->get();
osg::Node* node = layer->getNode();
if ( node )
{
// configure for intersection:
osg::Vec3d surface;
point.toWorld( surface );
// trivial bounds check:
if ( node->getBound().contains(surface) )
{
osg::Vec3d nvector;
point.createWorldUpVector(nvector);
osg::Vec3d start( surface + nvector*5e5 );
osg::Vec3d end ( surface - nvector*5e5 );
// first time through, set up the intersector on demand
if ( !_lsi.valid() )
{
_lsi = new osgUtil::LineSegmentIntersector(start, end);
_lsi->setIntersectionLimit( _lsi->LIMIT_NEAREST );
}
else
{
_lsi->reset();
_lsi->setStart( start );
_lsi->setEnd ( end );
}
// try it.
iv.setIntersector( _lsi.get() );
node->accept( iv );
// check for a result!!
if ( _lsi->containsIntersections() )
{
osg::Vec3d isect = _lsi->getIntersections().begin()->getWorldIntersectPoint();
// transform back to input SRS:
GeoPoint output;
output.fromWorld( point.getSRS(), isect );
out_elevation = (float)output.z();
if ( out_actualResolution )
*out_actualResolution = 0.0;
return true;
}
}
else
{
//OE_INFO << LC << "Trivial rejection (bounds check)" << std::endl;
}
}
}
}
if (_elevationLayers.empty())
{
// this means there are no heightfields.
out_elevation = NO_DATA_VALUE;
return true;
}
// secure map pointer:
osg::ref_ptr<const Map> map;
if (!_map.lock(map))
{
return false;
}
// tile size (resolution of elevation tiles)
unsigned tileSize = 257; // yes?
// default LOD:
unsigned lod = 23u;
// attempt to map the requested resolution to an LOD:
if (desiredResolution > 0.0)
{
int level = map->getProfile()->getLevelOfDetailForHorizResolution(desiredResolution, tileSize);
if ( level > 0 )
lod = level;
}
// do we need a new ElevationEnvelope?
if (!_envelope.valid() ||
!point.getSRS()->isHorizEquivalentTo(_envelope->getSRS()) ||
lod != _envelope->getLOD())
{
_envelope = map->getElevationPool()->createEnvelope(point.getSRS(), lod);
}
// sample the elevation, and if requested, the resolution as well:
if (out_actualResolution)
{
std::pair<float, float> result = _envelope->getElevationAndResolution(point.x(), point.y());
out_elevation = result.first;
*out_actualResolution = result.second;
}
else
{
out_elevation = _envelope->getElevation(point.x(), point.y());
}
return out_elevation != NO_DATA_VALUE;
}
bool
ElevationQuery::getElevationImpl(const GeoPoint& point, /* abs */
double& out_elevation,
double desiredResolution,
double* out_actualResolution)
{
// assertion.
if ( !point.isAbsolute() )
{
OE_WARN << LC << "Assertion failure; input must be absolute" << std::endl;
return false;
}
osg::Timer_t begin = osg::Timer::instance()->tick();
// first try the terrain patches.
if ( _patchLayers.size() > 0 )
{
osgUtil::IntersectionVisitor iv;
for(std::vector<ModelLayer*>::iterator i = _patchLayers.begin(); i != _patchLayers.end(); ++i)
{
// find the scene graph for this layer:
osg::Node* node = (*i)->getSceneGraph( _mapf.getUID() );
if ( node )
{
// configure for intersection:
osg::Vec3d surface;
point.toWorld( surface );
// trivial bounds check:
if ( node->getBound().contains(surface) )
{
osg::Vec3d nvector;
point.createWorldUpVector(nvector);
osg::Vec3d start( surface + nvector*5e5 );
osg::Vec3d end ( surface - nvector*5e5 );
// first time through, set up the intersector on demand
if ( !_patchLayersLSI.valid() )
{
_patchLayersLSI = new DPLineSegmentIntersector(start, end);
_patchLayersLSI->setIntersectionLimit( _patchLayersLSI->LIMIT_NEAREST );
}
else
{
_patchLayersLSI->reset();
_patchLayersLSI->setStart( start );
_patchLayersLSI->setEnd ( end );
}
// try it.
iv.setIntersector( _patchLayersLSI.get() );
node->accept( iv );
// check for a result!!
if ( _patchLayersLSI->containsIntersections() )
{
osg::Vec3d isect = _patchLayersLSI->getIntersections().begin()->getWorldIntersectPoint();
// transform back to input SRS:
GeoPoint output;
output.fromWorld( point.getSRS(), isect );
out_elevation = output.z();
if ( out_actualResolution )
*out_actualResolution = 0.0;
return true;
}
}
else
{
//OE_INFO << LC << "Trivial rejection (bounds check)" << std::endl;
}
}
}
}
if ( _mapf.elevationLayers().empty() )
{
// this means there are no heightfields.
out_elevation = 0.0;
return true;
}
// tile size (resolution of elevation tiles)
unsigned tileSize = std::max(_mapf.getMapOptions().elevationTileSize().get(), 2u);
//This is the max resolution that we actually have data at this point
unsigned int bestAvailLevel = getMaxLevel( point.x(), point.y(), point.getSRS(), _mapf.getProfile());
if (desiredResolution > 0.0)
{
unsigned int desiredLevel = _mapf.getProfile()->getLevelOfDetailForHorizResolution( desiredResolution, tileSize );
if (desiredLevel < bestAvailLevel) bestAvailLevel = desiredLevel;
}
OE_DEBUG << LC << "Best available data level " << point.x() << ", " << point.y() << " = " << bestAvailLevel << std::endl;
// transform the input coords to map coords:
GeoPoint mapPoint = point;
if ( point.isValid() && !point.getSRS()->isHorizEquivalentTo( _mapf.getProfile()->getSRS() ) )
{
mapPoint = point.transform(_mapf.getProfile()->getSRS());
if ( !mapPoint.isValid() )
{
OE_WARN << LC << "Fail: coord transform failed" << std::endl;
return false;
}
}
// get the tilekey corresponding to the tile we need:
TileKey key = _mapf.getProfile()->createTileKey( mapPoint.x(), mapPoint.y(), bestAvailLevel );
if ( !key.valid() )
{
OE_WARN << LC << "Fail: coords fall outside map" << std::endl;
return false;
}
bool result = false;
while (!result)
{
GeoHeightField geoHF;
TileCache::Record record;
// Try to get the hf from the cache
if ( _cache.get( key, record ) )
{
geoHF = record.value();
}
else
{
// Create it
osg::ref_ptr<osg::HeightField> hf = new osg::HeightField();
hf->allocate( tileSize, tileSize );
// Initialize the heightfield to nodata
for (unsigned int i = 0; i < hf->getFloatArray()->size(); i++)
{
hf->getFloatArray()->at( i ) = NO_DATA_VALUE;
}
if (_mapf.populateHeightField(hf, key, false))
{
geoHF = GeoHeightField( hf.get(), key.getExtent() );
_cache.insert( key, geoHF );
}
}
if (geoHF.valid())
{
float elevation = 0.0f;
result = geoHF.getElevation( mapPoint.getSRS(), mapPoint.x(), mapPoint.y(), _mapf.getMapInfo().getElevationInterpolation(), mapPoint.getSRS(), elevation);
if (result && elevation != NO_DATA_VALUE)
{
// see what the actual resolution of the heightfield is.
if ( out_actualResolution )
*out_actualResolution = geoHF.getXInterval();
out_elevation = (double)elevation;
break;
}
else
{
result = false;
}
}
if (!result)
{
key = key.createParentKey();
if (!key.valid())
{
break;
}
}
}
osg::Timer_t end = osg::Timer::instance()->tick();
_queries++;
_totalTime += osg::Timer::instance()->delta_s( begin, end );
return result;
}
