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51 lines
1.8 KiB
Bash
Executable File
51 lines
1.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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# fetch-terrain-tiles.sh — download UK terrain tiles (terrarium-encoded PNG)
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# from the AWS Open Data "elevation-tiles-prod" bucket into ./terrain-tiles.
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#
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# Reproduces the DEM tile set the ukmesh map consumes via TERRAIN_DEM_SOURCE
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# (frontend/src/components/Map/mapConfig.ts: raster-dem, terrarium, z5-12).
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# Designed to run anywhere with python3 + curl; resumable (skips existing).
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#
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# Usage: ./fetch-terrain-tiles.sh [OUTDIR]
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# Env: LON_MIN LON_MAX LAT_MIN LAT_MAX Z_MIN Z_MAX JOBS (defaults below)
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set -euo pipefail
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OUT="${1:-terrain-tiles}"
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: "${LON_MIN:=-11}"; : "${LON_MAX:=3}"; : "${LAT_MIN:=49.5}"; : "${LAT_MAX:=61}"
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: "${Z_MIN:=0}"; : "${Z_MAX:=12}"; : "${JOBS:=32}"
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BASE="https://s3.amazonaws.com/elevation-tiles-prod/terrarium"
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mkdir -p "$OUT"
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python3 - "$LON_MIN" "$LON_MAX" "$LAT_MIN" "$LAT_MAX" "$Z_MIN" "$Z_MAX" <<'PY' \
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| OUT="$OUT" BASE="$BASE" xargs -P "$JOBS" -n1 bash -c '
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IFS=/ read -r z x y <<< "$0"
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d="$OUT/$z/$x"; f="$d/$y.png"
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if [ -f "$f" ]; then exit 0; fi
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mkdir -p "$d"
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curl -fsS --retry 4 --retry-delay 2 -o "$f" "$BASE/$z/$x/$y.png"
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'
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import sys, math
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lon_min, lon_max, lat_min, lat_max, z_min, z_max = map(float, sys.argv[1:7])
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z_min, z_max = int(z_min), int(z_max)
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def xy(lon, lat, z):
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n = 2 ** z
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x = int((lon + 180.0) / 360.0 * n)
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r = math.radians(lat)
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y = int((1.0 - math.asinh(math.tan(r)) / math.pi) / 2.0 * n)
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return x, y
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for z in range(z_min, z_max + 1):
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x1, _ = xy(lon_min, lat_min, z)
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x2, _ = xy(lon_max, lat_min, z)
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_, y1 = xy(lon_min, lat_max, z) # north edge (smaller y)
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_, y2 = xy(lon_min, lat_min, z) # south edge (larger y)
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for x in range(x1, x2 + 1):
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for y in range(y1, y2 + 1):
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print(f"{z}/{x}/{y}")
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PY
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echo "fetch-terrain-tiles: done -> $OUT"
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