Revision Map::getElevationLayers( ElevationLayerVector& out_list ) const { out_list.reserve( _elevationLayers.size() ); Threading::ScopedReadLock lock( const_cast<Map*>(this)->_mapDataMutex ); for( ElevationLayerVector::const_iterator i = _elevationLayers.begin(); i != _elevationLayers.end(); ++i ) out_list.push_back( i->get() ); return _dataModelRevision; }
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. ElevationLayerVector contenders; ElevationLayerVector offsets; 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()); // Note: isKeyInRange tests the key, but haData tests the mapped key. // I think that's right! if ((layer->getTileSource() == 0L) || (layer->isKeyInRange(key) && layer->getTileSource()->hasData(mappedKey))) { if (layer->isOffset()) offsets.push_back(layer); else contenders.push_back(layer); } } } // nothing? bail out. if ( contenders.empty() && offsets.empty() ) { 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); // We will load the actual heightfields on demand. We might not need them all. GeoHeightFieldVector heightFields(contenders.size()); GeoHeightFieldVector offsetFields(offsets.size()); std::vector<bool> heightFailed (contenders.size(), false); std::vector<bool> offsetFailed(offsets.size(), false); const SpatialReference* keySRS = keyToUse.getProfile()->getSRS(); bool realData = false; 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) { if ( heightFailed[i] ) continue; GeoHeightField& layerHF = heightFields[i]; if ( !layerHF.valid() ) { TileKey mappedKey = keyToUse.mapResolution(hf->getNumColumns(), contenders[i]->getTileSize()); layerHF = contenders[i]->createHeightField(mappedKey, progress); if ( !layerHF.valid() ) { heightFailed[i] = true; continue; } } // If we actually got a layer then we have real data realData = true; float elevation; if (layerHF.getElevation(keySRS, x, y, interpolation, keySRS, elevation) && elevation != NO_DATA_VALUE) { resolved = true; hf->setHeight(c, r, elevation); } } for(int i=offsets.size()-1; i>=0; --i) { if ( offsetFailed[i] ) continue; GeoHeightField& layerHF = offsetFields[i]; if ( !layerHF.valid() ) { TileKey mappedKey = keyToUse.mapResolution(hf->getNumColumns(), offsets[i]->getTileSize()); layerHF = offsets[i]->createHeightField(mappedKey, progress); if ( !layerHF.valid() ) { offsetFailed[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; }