64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
"""Titiler-based Mars tile server for MGS MOLA ClrShade global basemap"""
|
||
|
||
import math
|
||
|
||
from fastapi import FastAPI
|
||
from pyproj import CRS
|
||
from morecantile import tms, TileMatrixSet
|
||
from rio_tiler.io import Reader
|
||
|
||
from titiler.core.factory import TilerFactory
|
||
|
||
# Mars SimpleCylindrical CRS (equidistant cylindrical projection in meters)
|
||
MARS_CRS = CRS.from_proj4(
|
||
"+proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 "
|
||
"+a=3396190 +b=3396190 +units=m +no_defs"
|
||
)
|
||
|
||
# Mars extent in equidistant cylindrical projection
|
||
# x = R × lon_rad, y = R × lat_rad
|
||
_R = 3396190
|
||
_MAX_X = _R * math.pi # ≈ 10,669,442 m (corresponds to ±180°)
|
||
_MAX_Y = _R * math.pi / 2 # ≈ 5,334,721 m (corresponds to ±90°)
|
||
|
||
# Custom TMS for Mars with matrix_scale=[2, 1] to match Cesium GeographicTilingScheme
|
||
MARS_TMS = TileMatrixSet.custom(
|
||
crs=MARS_CRS,
|
||
extent=(-_MAX_X, -_MAX_Y, _MAX_X, _MAX_Y),
|
||
identifier="MarsCylindrical",
|
||
matrix_scale=[2, 1],
|
||
)
|
||
|
||
# Register custom TMS
|
||
tms = tms.register({"MarsCylindrical": MARS_TMS})
|
||
|
||
# Create FastAPI app
|
||
app = FastAPI(
|
||
title="Titiler Mars",
|
||
description="Mars MGS MOLA Color-Shaded Relief global tile server powered by Titiler",
|
||
)
|
||
|
||
# Create COG Tiler with Mars TMS support
|
||
cog = TilerFactory(
|
||
reader=Reader,
|
||
supported_tms=tms,
|
||
)
|
||
|
||
app.include_router(cog.router, tags=["Cloud Optimized GeoTIFF"])
|
||
|
||
|
||
@app.get("/", include_in_schema=False)
|
||
def landing():
|
||
"""Landing page."""
|
||
return {
|
||
"title": "Titiler Mars Tile Server",
|
||
"description": "Mars MGS MOLA Color-Shaded Relief global tile server",
|
||
"endpoints": {
|
||
"tiles": "/tiles/MarsCylindrical/{z}/{x}/{y}?url=<data_url>",
|
||
"tilejson": "/MarsCylindrical/tilejson.json?url=<data_url>",
|
||
"info": "/info?url=<data_url>",
|
||
"preview": "/preview.png?url=<data_url>&max_size=512",
|
||
"docs": "/docs",
|
||
},
|
||
}
|