MaplyElevationDatabase

@interface MaplyElevationDatabase : NSObject <MaplyElevationSourceDelegate>

An elevation source corresponding to a custom sqlite database.

The Maply Elevation Database object interfaces to a custom sqlite database that contains elevation tiles. This is the output of the elev_tile_pyramid command line tool. See that for details. Suffice it to say that each tile is separate, contains one extra cell on the northern and eastern sides and is made up for shorts (16 bit).

See

MaplyElevationSourceDelegate

  • Left side of the extents in the local coordinate system

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) double minX;

    Swift

    var minX: Double { get set }

  • Bottom side of the extents in the local coordinate system

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) double minY;

    Swift

    var minY: Double { get set }

  • Right side of the extents in the local coordinate system

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) double maxX;

    Swift

    var maxX: Double { get set }

  • Top side of the extents in the local coordinate system

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) double maxY;

    Swift

    var maxY: Double { get set }

  • Number of samples in the X direction for each tile

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) unsigned int tileSizeX;

    Swift

    var tileSizeX: UInt32 { get set }

  • Number of samples in the Y direction for each tile

    Declaration

    Objective-C

    @property (assign, readwrite, nonatomic) unsigned int tileSizeY;

    Swift

    var tileSizeY: UInt32 { get set }

  • Initialize with the full path or name of the sqlite file.

    It looks for the full path first and then will try to find the name in the bundle with an extension of @sqlite if that failes.

    Declaration

    Objective-C

    - (nullable instancetype)initWithName:(NSString *_Nonnull)name;

    Swift

    init?(name: String)

    Return Value

    Returns a valid elevation database object or nil on failure.

  • Minimum zoom level (e.g. 0) as read from the file

    Declaration

    Objective-C

    - (int)minZoom;

    Swift

    func minZoom() -> Int32

  • Maximum zoom level (e.g. 17) as read from the file

    Declaration

    Objective-C

    - (int)maxZoom;

    Swift

    func maxZoom() -> Int32

  • Returns elevaton data for the given tile.

    This will return elevation samples for the given tile in meters. The size of the tile is determined by the file (and static). Data will come from the file in 16 bit signed values, but then converted into 32 bit floating point values.

    Declaration

    Objective-C

    - (nullable MaplyElevationChunk *)elevForTile:(MaplyTileID)tileID;

    Swift

    func elev(forTile tileID: MaplyTileID) -> MaplyElevationChunk?

    Return Value

    Returns the elevation chunk corresonding to the given tile.