first commit

2026-02-22 10:51:28 +08:00
commit 7218809f1d
7 changed files with 1061 additions and 0 deletions
--- a/app.py
+++ b/app.py
@@ -0,0 +1,147 @@
+"""rio-tiler dynamic tile server for I7D16.tif"""
+
+import os
+from pathlib import Path
+
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import HTMLResponse
+from starlette.requests import Request
+from starlette.responses import Response
+
+from rio_tiler.errors import TileOutsideBounds
+from rio_tiler.io import Reader
+from rio_tiler.profiles import img_profiles
+
+DATA_PATH = str(Path(__file__).parent / "data" / "I7D16.tif")
+
+# Per-band rescale range derived from p2/p98 statistics of the source image
+# Band order: Red, Green, Blue (band 4 NIR is ignored)
+RESCALE = [
+    (6130, 40453),   # Red
+    (10641, 41211),  # Green
+    (12482, 36323),  # Blue
+]
+
+app = FastAPI(
+    title="rio-tiler",
+    description="Dynamic tile server for I7D16.tif (NJ 2020 aerial imagery)",
+)
+
+
+@app.get(
+    "/tiles/{z}/{x}/{y}.png",
+    responses={
+        200: {"content": {"image/png": {}}, "description": "Return a PNG tile."},
+        404: {"description": "Tile outside image bounds."},
+    },
+    response_class=Response,
+    description="Read COG tile and return a PNG image (RGB bands, UInt16 rescaled)",
+)
+def tile(z: int, x: int, y: int):
+    """Return a map tile for the given z/x/y coordinates."""
+    try:
+        with Reader(DATA_PATH) as cog:
+            img = cog.tile(x, y, z, indexes=(1, 2, 3))
+    except TileOutsideBounds:
+        raise HTTPException(status_code=404, detail="Tile outside image bounds")
+
+    content = img.render(
+        img_format="PNG",
+        rescale=RESCALE,
+        **img_profiles.get("png", {}),
+    )
+    return Response(content, media_type="image/png")
+
+
+@app.get("/tilejson.json", responses={200: {"description": "Return a TileJSON document"}})
+def tilejson(request: Request):
+    """Return a TileJSON 2.2.0 document describing the available tiles."""
+    with Reader(DATA_PATH) as cog:
+        bounds = cog.get_geographic_bounds(cog.tms.rasterio_geographic_crs)
+        minzoom = cog.minzoom
+        maxzoom = cog.maxzoom
+
+    base_url = str(request.base_url).rstrip("/")
+    tile_url = f"{base_url}/tiles/{{z}}/{{x}}/{{y}}.png"
+
+    return {
+        "tilejson": "2.2.0",
+        "name": os.path.basename(DATA_PATH),
+        "description": "NJ Open Imagery 2020 - NAD83(2011) / New Jersey (ftUS)",
+        "tiles": [tile_url],
+        "bounds": list(bounds),
+        "minzoom": minzoom,
+        "maxzoom": maxzoom,
+        "center": [
+            (bounds[0] + bounds[2]) / 2,
+            (bounds[1] + bounds[3]) / 2,
+            minzoom + 2,
+        ],
+    }
+
+
+@app.get("/", response_class=HTMLResponse)
+def index(request: Request):
+    """Simple Leaflet.js viewer for the imagery."""
+    with Reader(DATA_PATH) as cog:
+        bounds = cog.get_geographic_bounds(cog.tms.rasterio_geographic_crs)
+        minzoom = cog.minzoom
+        maxzoom = cog.maxzoom
+
+    base_url = str(request.base_url).rstrip("/")
+    tile_url = f"{base_url}/tiles/{{z}}/{{x}}/{{y}}.png"
+
+    center_lat = (bounds[1] + bounds[3]) / 2
+    center_lng = (bounds[0] + bounds[2]) / 2
+    init_zoom = minzoom + 2
+
+    return f"""<!DOCTYPE html>
+<html lang="en">
+<head>
+    <title>I7D16 Tile Viewer</title>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
+    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
+    <style>
+        html, body, #map {{ height: 100%; margin: 0; padding: 0; }}
+        #info {{
+            position: absolute; top: 10px; right: 10px; z-index: 1000;
+            background: white; padding: 10px 14px; border-radius: 4px;
+            font-family: sans-serif; font-size: 13px;
+            box-shadow: 0 2px 6px rgba(0,0,0,0.3);
+            line-height: 1.6;
+        }}
+    </style>
+</head>
+<body>
+<div id="map"></div>
+<div id="info">
+    <b>I7D16.tif</b><br>
+    NJ Open Imagery 2020<br>
+    Zoom: {minzoom}–{maxzoom}<br>
+    CRS: NAD83(2011) / NJ ftUS
+</div>
+<script>
+    var map = L.map('map').setView([{center_lat}, {center_lng}], {init_zoom});
+
+    L.tileLayer('https://{{s}}.tile.openstreetmap.org/{{z}}/{{x}}/{{y}}.png', {{
+        attribution: '© <a href="https://openstreetmap.org">OpenStreetMap</a>',
+        opacity: 0.4,
+        maxZoom: 19
+    }}).addTo(map);
+
+    L.tileLayer('{tile_url}', {{
+        minZoom: {minzoom},
+        maxZoom: {maxzoom},
+        opacity: 1.0,
+        attribution: 'NJ Open Imagery 2020'
+    }}).addTo(map);
+
+    map.fitBounds([
+        [{bounds[1]}, {bounds[0]}],
+        [{bounds[3]}, {bounds[2]}]
+    ]);
+</script>
+</body>
+</html>"""