Dear all,
I need some suggestion about flatten elevation.
This is my source code to add flatten elevation layer to Earth.
Map* map = m_mapNode->getMap();
OGRFeatureOptions flattenData;
flattenData.name() = "flatten";
flattenData.url() = FLATAREA_URL;
flattenData.buildSpatialIndex() = true;
FeatureElevationOptions options;
options.featureOptions() = flattenData;
options.attr() = "ELEVATION";
options.profile() = ProfileOptions("global-geodetic");
ElevationLayer *layer = new ElevationLayer(options);
layer->options().minLevel() = 7;
layer->options().maxLevel() = 17;
layer->setName("Flatten");
layer->options().terrainPatch() = true;
layer->options().cachePolicy() = CachePolicy::NO_CACHE;
map->addLayer(layer);
The result is here:

The flatten elevation is not smooth.
I change size tile of layer, but it's not effective.
Please help me.
Thanks you.