Custom layers and elevation exception

[Sphynx]

Hi all,

i'm testing to import some maps as TiledImageLayer. Everything is okay but I have an exception with a map :

1 mars 2012 12:06:35 gov.nasa.worldwind.terrain.BasicElevationModel getExtremeElevations
ATTENTION: Exception while determining extreme elevations for (56.98828125°, -20.00390625°), (92.98828125°, 15.99609375°)

The conf of my layer is :

	<FormatSuffix>.dds</FormatSuffix>
	<NumLevels count="12" numEmpty="11" />
	<Sector>
		<SouthWest>
			<LatLon latitude="56.98828125" longitude="-20.00390625" units="degrees" />
		</SouthWest>
		<NorthEast>
			<LatLon latitude="57.005859375" longitude="-19.96875" units="degrees" />
		</NorthEast>
	</Sector>
	<TileOrigin>
		<LatLon latitude="56.98828125" longitude="-20.00390625" units="degrees" />
	</TileOrigin>
	<TileSize>
		<Dimension height="512" width="512" />
	</TileSize>
	<LevelZeroTileDelta>
		<LatLon latitude="36.0" longitude="36.0" units="degrees" />
	</LevelZeroTileDelta>
	<Service serviceName="WWTileService" />
	<ImageFormat>image/dds</ImageFormat>
	<UseMipMaps>true</UseMipMaps>
	<UseTransparentTextures>true</UseTransparentTextures>
	<DetailHint>0.6020599913279625</DetailHint>

It seems the system try to load elevations for a tile at the level 0 with a size based on the level zero tile delta (36°). But the first level of my layer is the 12 and even if i remove the custom detail hint i still get the exception.
I tried to add a max ActiveAltitudes in my conf layer and there's no exception until the max altitude is reach.

The elevation model i use is EarthElevationModel.bil16 ant its conf layer :

	<DisplayName>USA 10m, World 30m, Ocean 900m</DisplayName>
	<MissingData signal="-9999.0" />
	<DataDetailHint>0.2</DataDetailHint>
	<DatasetName>mergedAsterElevations</DatasetName>
	<DataCacheName>Earth/EarthElevationModel.bil16</DataCacheName>
	<Service serviceName="OGC:WMS" version="1.3">
		<LayerNames>mergedAsterElevations</LayerNames>
		<GetMapURL>http://data.worldwind.arc.nasa.gov/elev</GetMapURL>
		<GetCapabilitiesURL>http://data.worldwind.arc.nasa.gov/elev</GetCapabilitiesURL>
	</Service>
	<LastUpdate>1261011661000</LastUpdate>
	<FormatSuffix>.bil</FormatSuffix>
	<NumLevels count="12" numEmpty="0" />
	<Sector>
		<SouthWest>
			<LatLon latitude="-90.0" longitude="-180.0" units="degrees" />
		</SouthWest>
		<NorthEast>
			<LatLon latitude="90.0" longitude="180.0" units="degrees" />
		</NorthEast>
	</Sector>
	<SectorResolutionLimit maxLevelNum="11">
		<Sector>
			<SouthWest>
				<LatLon latitude="24.0" longitude="-125.0" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="50.0" longitude="-66.8" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<SectorResolutionLimit maxLevelNum="11">
		<Sector>
			<SouthWest>
				<LatLon latitude="18.5" longitude="-160.5" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="22.5" longitude="-154.5" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<SectorResolutionLimit maxLevelNum="11">
		<Sector>
			<SouthWest>
				<LatLon latitude="17.8" longitude="-67.4" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="18.7" longitude="-64.5" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<SectorResolutionLimit maxLevelNum="11">
		<Sector>
			<SouthWest>
				<LatLon latitude="48.0" longitude="-179.9" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="66.0" longitude="-128.0" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<SectorResolutionLimit maxLevelNum="9">
		<Sector>
			<SouthWest>
				<LatLon latitude="-54.0" longitude="-180.0" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="60.0" longitude="180.0" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<SectorResolutionLimit maxLevelNum="4">
		<Sector>
			<SouthWest>
				<LatLon latitude="-90.0" longitude="-180.0" units="degrees" />
			</SouthWest>
			<NorthEast>
				<LatLon latitude="90.0" longitude="180.0" units="degrees" />
			</NorthEast>
		</Sector>
	</SectorResolutionLimit>
	<TileOrigin>
		<LatLon latitude="-90.0" longitude="-180.0" units="degrees" />
	</TileOrigin>
	<TileSize>
		<Dimension height="150" width="150" />
	</TileSize>
	<LevelZeroTileDelta>
		<LatLon latitude="20.0" longitude="20.0" units="degrees" />
	</LevelZeroTileDelta>
	<RetrievePropertiesFromService>true</RetrievePropertiesFromService>
	<ImageFormat>application/bil16</ImageFormat>
	<DataType byteOrder="LittleEndian" type="Int16" />
	<ExtremeElevations max="8850.0" min="-11000.0">
		<FileName>config/SRTM30Plus_ExtremeElevations_5.bil</FileName>
	</ExtremeElevations>

Thanks for your help.

Florent.

[Sphynx]

Well i found something in TiledImageLayer class : the createTopLevelTiles() method is called to create the topLevels field :

        Sector sector = this.levels.getSector();

        Level level = levels.getFirstLevel();
        Angle dLat = level.getTileDelta().getLatitude();
        Angle dLon = level.getTileDelta().getLongitude();
        Angle latOrigin = this.levels.getTileOrigin().getLatitude();
        Angle lonOrigin = this.levels.getTileOrigin().getLongitude();

The latOrigin and lonOrigin angles are okay but not dLat and dLon because the value is 36° (LevelZeroTileDelta) although my tile delta is 36 / Math.pow(2.0d, numEmpyLevels).

I'll try to set in my conf file <NumLevels count="1" numEmpty="0" /> and compute the correct LevelZeroTileDelta.


Edit : it works but I have to compute the ActiveAltitudes max not to show layers at all levels.