HoloMap.Source.RasterDEM (HoloMap v0.1.0)

Elevation tiles, encoded as RGB. The input for terrain and hillshade.

<HoloMap.Source.RasterDEM
  id="dem"
  tiles={["https://tiles.example.com/dem/{z}/{x}/{y}.png"]}
  encoding="terrarium"
  tile_size={256}
/>

<HoloMap.Terrain source="dem" exaggeration={1.5} />
<HoloMap.Layer.Hillshade id="relief" source="dem" />

Encoding

encoding must match how the tiles were produced, and there is no way to detect it. The wrong value renders a plausible-looking but entirely fictional landscape.

"mapbox": the Mapbox Terrain-RGB scheme (the default)
"terrarium": the Mapzen/AWS Terrain Tiles scheme
"custom": supply your own red_factor, green_factor, blue_factor and base_shift

Props

Prop	Type	Notes
`id`	string	Required. Referenced by `HoloMap.Terrain` and hillshade layers
`url`	string	TileJSON endpoint. Supply this or `tiles`
`tiles`	list	Tile URL templates containing `{z}`, `{x}`, `{y}`
`encoding`	string	`"mapbox"`, `"terrarium"` or `"custom"`
`tile_size`	number	Pixel size of one tile
`min_zoom` / `max_zoom`	number	Zoom range the tiles exist at
`bounds`	list	`[west, south, east, north]` extent of the data
`red_factor` / `green_factor` / `blue_factor` / `base_shift`	number	Custom encoding coefficients
`attribution`	string	Attribution text

Summary

Functions

__is_hologram_component__()

Returns true to indicate that the callee module is a component module (has "use Hologram.Component" directive).

__props__()

Returns the list of property definitions for the compiled component.

Functions

__is_hologram_component__()

@spec __is_hologram_component__() :: boolean()

Returns true to indicate that the callee module is a component module (has "use Hologram.Component" directive).

Examples

iex> __is_hologram_component__()
true

props()

@spec __props__() :: [{atom(), atom(), keyword()}]

Returns the list of property definitions for the compiled component.