148 lines
4.5 KiB
Python
148 lines
4.5 KiB
Python
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"""rio-tiler dynamic tile server for I7D16.tif"""
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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" / "I7D16.tif")
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# Per-band rescale range derived from p2/p98 statistics of the source image
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# Band order: Red, Green, Blue (band 4 NIR is ignored)
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RESCALE = [
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(6130, 40453), # Red
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(10641, 41211), # Green
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(12482, 36323), # Blue
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]
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app = FastAPI(
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title="rio-tiler",
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description="Dynamic tile server for I7D16.tif (NJ 2020 aerial imagery)",
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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 image bounds."},
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},
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response_class=Response,
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description="Read COG tile and return a PNG image (RGB bands, UInt16 rescaled)",
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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, indexes=(1, 2, 3))
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except TileOutsideBounds:
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raise HTTPException(status_code=404, detail="Tile outside image bounds")
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content = img.render(
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img_format="PNG",
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rescale=RESCALE,
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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 describing the available tiles."""
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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": os.path.basename(DATA_PATH),
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"description": "NJ Open Imagery 2020 - NAD83(2011) / New Jersey (ftUS)",
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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": [
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(bounds[0] + bounds[2]) / 2,
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(bounds[1] + bounds[3]) / 2,
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minzoom + 2,
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],
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}
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@app.get("/", response_class=HTMLResponse)
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def index(request: Request):
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"""Simple Leaflet.js viewer for the imagery."""
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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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center_lat = (bounds[1] + bounds[3]) / 2
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center_lng = (bounds[0] + bounds[2]) / 2
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init_zoom = minzoom + 2
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return f"""<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>I7D16 Tile Viewer</title>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
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<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
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<style>
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html, body, #map {{ height: 100%; margin: 0; padding: 0; }}
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#info {{
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position: absolute; top: 10px; right: 10px; z-index: 1000;
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background: white; padding: 10px 14px; border-radius: 4px;
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font-family: sans-serif; font-size: 13px;
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box-shadow: 0 2px 6px rgba(0,0,0,0.3);
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line-height: 1.6;
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}}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<div id="info">
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<b>I7D16.tif</b><br>
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NJ Open Imagery 2020<br>
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Zoom: {minzoom}–{maxzoom}<br>
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CRS: NAD83(2011) / NJ ftUS
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</div>
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<script>
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var map = L.map('map').setView([{center_lat}, {center_lng}], {init_zoom});
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L.tileLayer('https://{{s}}.tile.openstreetmap.org/{{z}}/{{x}}/{{y}}.png', {{
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attribution: '© <a href="https://openstreetmap.org">OpenStreetMap</a>',
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opacity: 0.4,
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maxZoom: 19
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}}).addTo(map);
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L.tileLayer('{tile_url}', {{
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minZoom: {minzoom},
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maxZoom: {maxzoom},
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opacity: 1.0,
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attribution: 'NJ Open Imagery 2020'
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}}).addTo(map);
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map.fitBounds([
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[{bounds[1]}, {bounds[0]}],
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[{bounds[3]}, {bounds[2]}]
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]);
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</script>
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</body>
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</html>"""
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