raster.ts

1	/**
2	* Metadata for the rasters `npm run terrain` writes into static/.
3	*
4	* These must match the `render` block of content/geography.json — the generator
5	* reads that file, the browser only ever sees the PNGs, and nothing in between
6	* carries the numbers across. test/raster.test.ts asserts the two agree, because
7	* a silent disagreement here would displace the terrain rather than break it, and
8	* that failure mode has already cost this project once (D-024).
9	*/
10	export const RASTER_WIDTH = 2048
11	export const RASTER_HEIGHT = 1192
12	/**
13	* The working range terrain-height.png is stretched across: black is the floor of
14	* it, white the ceiling. It is deliberately not a round number and not anchored at
15	* zero — it only has to cover the terrain that exists, and the tighter it is the
16	* finer every step in it. Below zero is real: lake and sea floors are cut beneath
17	* the datum, and the old fixed 0..5,000 m encoding clipped them flat.
18	*/
19	export const RASTER_MIN_HEIGHT_M = -560
20	export const RASTER_MAX_HEIGHT_M = 4400
21	export const RASTER_HEIGHT_SPAN_M = RASTER_MAX_HEIGHT_M - RASTER_MIN_HEIGHT_M
22
23	export const COLOR_RASTER = 'terrain-color.png'
24	export const HEIGHT_RASTER = 'terrain-height.png'