Bland.Basemaps.Earth (Elixir Technical Drawing v0.2.0)

Hand-curated, low-resolution Earth coastline, border, and reference line data.

All coordinates are {longitude_deg, latitude_deg}. Continental outlines are closed polygons (first point == last point) traced roughly clockwise. They have enough detail to be recognizable at world scale and not more — this is a schematic data set, not a cartographic one.

Summary

Types

feature()

Functions

borders(resolution \\ :low)

Returns the list of political border features at the requested resolution.

coastlines(resolution \\ :low)

Returns the list of coastline features at the requested resolution.

tropics()

Returns the standard reference parallels as open polylines spanning lon ∈ [-180, 180]. Useful as dashed or dotted overlay lines.

Types

feature()

@type feature() :: %{
  name: String.t(),
  points: [{float(), float()}],
  closed?: boolean()
}

Functions

borders(resolution \\ :low)

@spec borders(:low | :high | :schematic) :: [Bland.Basemaps.feature()]

Returns the list of political border features at the requested resolution.

:low — Natural Earth 1:110m (default). 177 sovereign polygons, ~10k points, ~180 KB compiled.
:high — Natural Earth 1:50m. ~240 polygons (including disputed areas), ~100k points, ~1.6 MB compiled.
:schematic — the 10 hand-curated national outlines shipped with BLAND 0.1.

coastlines(resolution \\ :low)

@spec coastlines(:low | :high | :schematic) :: [Bland.Basemaps.feature()]

Returns the list of coastline features at the requested resolution.

Resolutions

:low — Natural Earth 1:110m (default). ~130 features, ~5k points, ~90 KB compiled.
:high — Natural Earth 1:50m. ~1,400 features, ~60k points, ~1 MB compiled.
:schematic — the hand-curated continental outlines shipped with BLAND 0.1 (15 features). Useful when you want a deliberately rough, "drawn by a draftsman" look.

All three datasets share the same feature-map shape: %{name: String.t(), points: [{lon, lat}], closed?: bool}.

tropics()

@spec tropics() :: [Bland.Basemaps.feature()]

Returns the standard reference parallels as open polylines spanning lon ∈ [-180, 180]. Useful as dashed or dotted overlay lines.