void
TileModelFactory::buildElevation(const TileKey& key,
const MapFrame& frame,
bool accumulate,
TileModel* model,
ProgressCallback* progress)
{
const MapInfo& mapInfo = frame.getMapInfo();
const osgEarth::ElevationInterpolation& interp =
frame.getMapOptions().elevationInterpolation().get();
// Request a heightfield from the map, falling back on lower resolution tiles
// if necessary (fallback=true)
osg::ref_ptr<osg::HeightField> hf;
bool isFallback = false;
if (_hfCache->getOrCreateHeightField(frame, key, accumulate, hf, isFallback, SAMPLE_FIRST_VALID, interp, progress))
{
model->_elevationData = TileModel::ElevationData(
hf,
GeoLocator::createForKey( key, mapInfo ),
isFallback );
// Edge normalization: requires adjacency information
if ( _terrainOptions.normalizeEdges() == true )
{
for( int x=-1; x<=1; x++ )
{
for( int y=-1; y<=1; y++ )
{
if ( x != 0 || y != 0 )
{
TileKey nk = key.createNeighborKey(x, y);
if ( nk.valid() )
{
osg::ref_ptr<osg::HeightField> hf;
if (_hfCache->getOrCreateHeightField(frame, nk, accumulate, hf, isFallback, SAMPLE_FIRST_VALID, interp, progress) )
{
model->_elevationData.setNeighbor( x, y, hf.get() );
}
}
}
}
}
// parent too.
if ( key.getLOD() > 0 )
{
osg::ref_ptr<osg::HeightField> hf;
if ( _hfCache->getOrCreateHeightField(frame, key.createParentKey(), accumulate, hf, isFallback, SAMPLE_FIRST_VALID, interp, progress) )
{
model->_elevationData.setParent( hf.get() );
}
}
}
}
}
void
TileModelFactory::buildElevation(const TileKey& key,
const MapFrame& frame,
bool accumulate,
bool buildTexture,
TileModel* model,
ProgressCallback* progress)
{
const MapInfo& mapInfo = frame.getMapInfo();
const osgEarth::ElevationInterpolation& interp =
frame.getMapOptions().elevationInterpolation().get();
// Request a heightfield from the map, falling back on lower resolution tiles
// if necessary (fallback=true)
osg::ref_ptr<osg::HeightField> hf;
bool isFallback = false;
// look up the parent's heightfield to use as a template
osg::ref_ptr<osg::HeightField> parentHF;
TileKey parentKey = key.createParentKey();
if ( accumulate )
{
osg::ref_ptr<TileNode> parentNode;
if (_liveTiles->get(parentKey, parentNode))
{
parentHF = parentNode->getTileModel()->_elevationData.getHeightField();
if ( _debug && key.getLOD() > 0 && !parentHF.valid() )
{
OE_NOTICE << LC << "Could not find a parent tile HF for " << key.str() << "\n";
}
}
}
// Make a new heightfield:
if (_meshHFCache->getOrCreateHeightField(frame, key, parentHF.get(), hf, isFallback, SAMPLE_FIRST_VALID, interp, progress))
{
model->_elevationData = TileModel::ElevationData(
hf,
GeoLocator::createForKey( key, mapInfo ),
isFallback );
// Edge normalization: requires adjacency information
if ( _terrainOptions.normalizeEdges() == true )
{
for( int x=-1; x<=1; x++ )
{
for( int y=-1; y<=1; y++ )
{
if ( x != 0 || y != 0 )
{
TileKey neighborKey = key.createNeighborKey(x, y);
if ( neighborKey.valid() )
{
osg::ref_ptr<osg::HeightField> neighborParentHF;
if ( accumulate )
{
TileKey neighborParentKey = neighborKey.createParentKey();
if (neighborParentKey == parentKey)
{
neighborParentHF = parentHF;
}
else
{
osg::ref_ptr<TileNode> neighborParentNode;
if (_liveTiles->get(neighborParentKey, neighborParentNode))
{
neighborParentHF = neighborParentNode->getTileModel()->_elevationData.getHeightField();
}
}
}
// only pull the tile if we have a valid parent HF for it -- otherwise
// you might get a flat tile when upsampling data.
if ( neighborParentHF.valid() )
{
osg::ref_ptr<osg::HeightField> hf;
if (_meshHFCache->getOrCreateHeightField(frame, neighborKey, neighborParentHF.get(), hf, isFallback, SAMPLE_FIRST_VALID, interp, progress) )
{
model->_elevationData.setNeighbor( x, y, hf.get() );
}
}
}
}
}
}
// parent too.
if ( parentHF.valid() )
{
model->_elevationData.setParent( parentHF.get() );
}
}
if ( buildTexture )
{
model->generateElevationTexture();
}
}
}
bool
ElevationLayerVector::populateHeightField(osg::HeightField* hf,
const TileKey& key,
const Profile* haeProfile,
ElevationInterpolation interpolation,
ProgressCallback* progress ) const
{
// heightfield must already exist.
if ( !hf )
return false;
// if the caller provided an "HAE map profile", he wants an HAE elevation grid even if
// the map profile has a vertical datum. This is the usual case when building the 3D
// terrain, for example. Construct a temporary key that doesn't have the vertical
// datum info and use that to query the elevation data.
TileKey keyToUse = key;
if ( haeProfile )
{
keyToUse = TileKey(key.getLOD(), key.getTileX(), key.getTileY(), haeProfile );
}
// Collect the valid layers for this tile.
LayerAndKeyVector contenders;
LayerAndKeyVector offsets;
// Track the number of layers that would return fallback data.
unsigned numFallbackLayers = 0;
// Check them in reverse order since the highest priority is last.
for(ElevationLayerVector::const_reverse_iterator i = this->rbegin(); i != this->rend(); ++i)
{
ElevationLayer* layer = i->get();
if ( layer->getEnabled() && layer->getVisible() )
{
// calculate the resolution-mapped key (adjusted for tile resolution differential).
TileKey mappedKey = keyToUse.mapResolution(
hf->getNumColumns(),
layer->getTileSize() );
bool useLayer = true;
TileKey bestKey( mappedKey );
// Is there a tilesource? If not we are cache-only and cannot reject the layer.
if ( layer->getTileSource() )
{
// Check whether the non-mapped key is valid according to the user's min/max level settings:
if ( !layer->isKeyInRange(key) )
{
useLayer = false;
}
// Find the "best available" mapped key from the tile source:
else
{
if ( layer->getTileSource()->getBestAvailableTileKey(mappedKey, bestKey) )
{
// If the bestKey is not the mappedKey, this layer is providing
// fallback data (data at a lower resolution than requested)
if ( mappedKey != bestKey )
{
numFallbackLayers++;
}
}
else
{
useLayer = false;
}
}
}
if ( useLayer )
{
if ( layer->isOffset() )
{
offsets.push_back( std::make_pair(layer, bestKey) );
}
else
{
contenders.push_back( std::make_pair(layer, bestKey) );
}
}
}
}
// nothing? bail out.
if ( contenders.empty() && offsets.empty() )
{
return false;
}
// if everything is fallback data, bail out.
if ( contenders.size() + offsets.size() == numFallbackLayers )
{
return false;
}
// Sample the layers into our target.
unsigned numColumns = hf->getNumColumns();
unsigned numRows = hf->getNumRows();
double xmin = key.getExtent().xMin();
double ymin = key.getExtent().yMin();
double dx = key.getExtent().width() / (double)(numColumns-1);
double dy = key.getExtent().height() / (double)(numRows-1);
// If the incoming heightfield requests a positive border width,
// we need to adjust the extents so that we request data outside the
// extent of the tile key:
unsigned border = hf->getBorderWidth();
if (border > 0u)
{
dx = key.getExtent().width() / (double)(numColumns - (border*2+1));
dy = key.getExtent().height() / (double)(numRows - (border*2+1));
xmin -= dx * (double)border;
ymin -= dy * (double)border;
}
// We will load the actual heightfields on demand. We might not need them all.
#if 0
GeoHeightFieldVector heightFields(contenders.size());
GeoHeightFieldVector offsetFields(offsets.size());
std::vector<bool> heightFallback(contenders.size(), false);
std::vector<bool> heightFailed(contenders.size(), false);
std::vector<bool> offsetFailed(offsets.size(), false);
#else
GeoHeightFieldVector heightFields[9];
GeoHeightFieldVector offsetFields[9]; //(offsets.size());
std::vector<bool> heightFallback[9]; //(contenders.size(), false);
std::vector<bool> heightFailed[9]; //(contenders.size(), false);
std::vector<bool> offsetFailed[9]; //(offsets.size(), false);
for (int n = 0; n < 9; ++n)
{
heightFields[n].resize(contenders.size());
offsetFields[n].resize(offsets.size());
heightFallback[n].assign(9, false);
heightFailed[n].assign(9, false);
offsetFailed[n].assign(9, false);
}
#endif
// The maximum number of heightfields to keep in this local cache
unsigned int maxHeightFields = 50;
unsigned numHeightFieldsInCache = 0;
const SpatialReference* keySRS = keyToUse.getProfile()->getSRS();
bool realData = false;
unsigned int total = numColumns * numRows;
unsigned int completed = 0;
int nodataCount = 0;
for (unsigned c = 0; c < numColumns; ++c)
{
double x = xmin + (dx * (double)c);
for (unsigned r = 0; r < numRows; ++r)
{
double y = ymin + (dy * (double)r);
// Collect elevations from each layer as necessary.
bool resolved = false;
for(int i=0; i<contenders.size() && !resolved; ++i)
{
ElevationLayer* layer = contenders[i].first.get();
TileKey contenderKey = contenders[i].second;
// If there is a border, the edge points may not fall within the key extents
// and we may need to fetch a neighboring key.
int n = 4; // index 4 is the center/default tile
if (border > 0u && !contenderKey.getExtent().contains(x, y))
{
int dTx = x < contenderKey.getExtent().xMin() ? -1 : x > contenderKey.getExtent().xMax() ? +1 : 0;
int dTy = y < contenderKey.getExtent().yMin() ? +1 : y > contenderKey.getExtent().yMax() ? -1 : 0;
contenderKey = contenderKey.createNeighborKey(dTx, dTy);
n = (dTy+1)*3 + (dTx+1);
}
if ( heightFailed[n][i] )
continue;
TileKey actualKey = contenderKey;
GeoHeightField& layerHF = heightFields[n][i];
if (!layerHF.valid())
{
// We couldn't get the heightfield from the cache, so try to create it.
// We also fallback on parent layers to make sure that we have data at the location even if it's fallback.
while (!layerHF.valid() && actualKey.valid())
{
layerHF = layer->createHeightField(actualKey, progress);
if (!layerHF.valid())
{
actualKey = actualKey.createParentKey();
}
}
// Mark this layer as fallback if necessary.
if (layerHF.valid())
{
heightFallback[n][i] = (actualKey != contenderKey); // actualKey != contenders[i].second;
numHeightFieldsInCache++;
}
else
{
heightFailed[n][i] = true;
continue;
}
}
if (layerHF.valid())
{
bool isFallback = heightFallback[n][i];
// We only have real data if this is not a fallback heightfield.
if (!isFallback)
{
realData = true;
}
float elevation;
if (layerHF.getElevation(keySRS, x, y, interpolation, keySRS, elevation))
{
if ( elevation != NO_DATA_VALUE )
{
resolved = true;
hf->setHeight(c, r, elevation);
}
else
{
++nodataCount;
}
}
}
// Clear the heightfield cache if we have too many heightfields in the cache.
if (numHeightFieldsInCache >= maxHeightFields)
{
//OE_NOTICE << "Clearing cache" << std::endl;
for (unsigned int j = 0; j < 9; ++j)
{
for (unsigned int k = 0; k < heightFields[j].size(); k++)
{
heightFields[j][k] = GeoHeightField::INVALID;
heightFallback[j][k] = false;
}
}
numHeightFieldsInCache = 0;
}
}
for(int i=offsets.size()-1; i>=0; --i)
{
TileKey contenderKey = offsets[i].second;
// If there is a border, the edge points may not fall within the key extents
// and we may need to fetch a neighboring key.
int n = 4; // index 4 is the center/default tile
if (border > 0u && !contenderKey.getExtent().contains(x, y))
{
int dTx = x < contenderKey.getExtent().xMin() ? -1 : x > contenderKey.getExtent().xMax() ? +1 : 0;
int dTy = y < contenderKey.getExtent().yMin() ? +1 : x > contenderKey.getExtent().yMax() ? -1 : 0;
contenderKey = contenderKey.createNeighborKey(dTx, dTy);
n = (dTy+1)*3 + (dTx+1);
}
if ( offsetFailed[n][i] == true )
continue;
GeoHeightField& layerHF = offsetFields[n][i];
if ( !layerHF.valid() )
{
ElevationLayer* offset = offsets[i].first.get();
layerHF = offset->createHeightField(contenderKey, progress);
if ( !layerHF.valid() )
{
offsetFailed[n][i] = true;
continue;
}
}
// If we actually got a layer then we have real data
realData = true;
float elevation = 0.0f;
if (layerHF.getElevation(keySRS, x, y, interpolation, keySRS, elevation) &&
elevation != NO_DATA_VALUE)
{
hf->getHeight(c, r) += elevation;
}
}
}
}
// Return whether or not we actually read any real data
return realData;
}
