68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
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"""rio-tiler dynamic tile server for Natural Earth HYP_HR_SR_OB_DR (global basemap)"""
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import os
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from pathlib import Path
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from fastapi import FastAPI, HTTPException
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from fastapi.responses import HTMLResponse
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from starlette.requests import Request
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from starlette.responses import Response
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from rio_tiler.errors import TileOutsideBounds
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from rio_tiler.io import Reader
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from rio_tiler.profiles import img_profiles
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DATA_PATH = str(Path(__file__).parent / "data" / "HYP_HR_SR_OB_DR_cog.tif")
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app = FastAPI(
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title="rio-tiler world",
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description="Global basemap tile server - Natural Earth HYP_HR_SR_OB_DR",
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)
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@app.get(
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"/tiles/{z}/{x}/{y}.png",
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responses={
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200: {"content": {"image/png": {}}, "description": "Return a PNG tile."},
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404: {"description": "Tile outside bounds."},
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},
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response_class=Response,
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description="Read global COG tile and return PNG (uint8 RGB, no rescaling needed)",
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)
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def tile(z: int, x: int, y: int):
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"""Return a map tile for the given z/x/y coordinates."""
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try:
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with Reader(DATA_PATH) as cog:
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img = cog.tile(x, y, z)
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except TileOutsideBounds:
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raise HTTPException(status_code=404, detail="Tile outside bounds")
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content = img.render(
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img_format="PNG",
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**img_profiles.get("png", {}),
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)
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return Response(content, media_type="image/png")
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@app.get("/tilejson.json", responses={200: {"description": "Return a TileJSON document"}})
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def tilejson(request: Request):
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"""Return a TileJSON 2.2.0 document."""
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with Reader(DATA_PATH) as cog:
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bounds = cog.get_geographic_bounds(cog.tms.rasterio_geographic_crs)
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minzoom = cog.minzoom
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maxzoom = cog.maxzoom
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base_url = str(request.base_url).rstrip("/")
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tile_url = f"{base_url}/tiles/{{z}}/{{x}}/{{y}}.png"
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return {
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"tilejson": "2.2.0",
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"name": "Natural Earth - HYP_HR_SR_OB_DR",
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"description": "Natural Earth cross-blended hypsometric tints with shaded relief",
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"tiles": [tile_url],
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"bounds": list(bounds),
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"minzoom": minzoom,
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"maxzoom": maxzoom,
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"center": [0, 20, minzoom],
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}
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