tilebench

Inspect HEAD/LIST/GET requests withing Rasterio.

Note: This will be covered in NEXT GDAL release https://github.com/OSGeo/gdal/pull/2742

API

from tilebench import profile
import rasterio

@profile()
def info(src_path: str):
    with rasterio.open(src_path) as src_dst:
        return src_dst.meta

meta = info("https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif")

> 2020-07-13T16:59:05.685976-0400 | TILEBENCH | {"LIST": {"count": 0}, "HEAD": {"count": 1}, "GET": {"count": 1, "bytes": 16384, "ranges": ["0-16383"]}, "Timing": 0.8030309677124023}

from tilebench import profile
from rio_tiler.io import cogeo as COGReader

@profile()
def _read_tile(src_path: str, x: int, y: int, z: int, tilesize: int = 256):
    with COGReader(src_path) as cog:
        return cog.tile(x, y, z, tilesize=tilesize)

data, mask = _read_tile(
    "https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif",
    2314,
    1667,
    12,
)

> 2020-07-13T16:59:42.654071-0400 | TILEBENCH | {"LIST": {"count": 0}, "HEAD": {"count": 1}, "GET": {"count": 3, "bytes": 1464479, "ranges": ["0-16383", "33328080-34028784", "36669144-37416533"]}, "Timing": 3.007672071456909}

Starlette Middleware

In addition of the viz CLI we added a starlette middleware to easily integrate VSI statistics in your web services.

from fastapi import FastAPI

from tilebench.middleware import VSIStatsMiddleware

app = FastAPI()
app.add_middleware(VSIStatsMiddleware)

The middleware will add a vsi-stats entrie in the response headers in form of:

vsi-stats: list;count=1, head;count=1, get;count=2;size=196608, ranges; values=0-65535|65536-196607

Command Line Interface (CLI)

$ tilebench --help
Usage: tilebench [OPTIONS] COMMAND [ARGS]...

  Command line interface for the tilebench Python package.

Options:
  --help  Show this message and exit.

Commands:
  get-zooms  Get Mercator Zoom levels.
  profile    Profile COGReader Mercator Tile read.
  random     Get random tile.
  viz        WEB UI to visualize VSI statistics for a web mercator tile request

Examples

$ tilebench get-zooms https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif | jq
{
  "minzoom": 7,
  "maxzoom": 12
}

$ tilebench random https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif --zoom 12
12-2314-1667

$ tilebench profile https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif 12-2314-1667 --config GDAL_DISABLE_READDIR_ON_OPEN=EMPTY_DIR | jq
{
  "LIST": {
    "count": 0
  },
  "HEAD": {
    "count": 1
  },
  "GET": {
    "count": 3,
    "bytes": 1464479,
    "ranges": [
      "0-16383",
      "33328080-34028784",
      "36669144-37416533"
    ]
  },
  "Timing": 2.377608060836792
}

$ tilebench profile https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif 12-2314-1667 --config GDAL_DISABLE_READDIR_ON_OPEN=FALSE | jq
{
  "LIST": {
    "count": 1
  },
  "HEAD": {
    "count": 8
  },
  "GET": {
    "count": 11,
    "bytes": 1464479,
    "ranges": [
      "0-16383",
      "33328080-34028784",
      "36669144-37416533"
    ]
  },
  "Timing": 7.09281587600708
}

GDAL config options

• GDAL_DISABLE_READDIR_ON_OPEN
• GDAL_INGESTED_BYTES_AT_OPEN
• CPL_VSIL_CURL_ALLOWED_EXTENSIONS
• GDAL_CACHEMAX,
• GDAL_HTTP_MERGE_CONSECUTIVE_RANGES
• VSI_CACHE
• VSI_CACHE_SIZE ...

See the full list at https://gdal.org/user/configoptions.html

Visulizing Internal tiles Vs Mercator grid

$ tilebench viz https://sentinel-cogs.s3.us-west-2.amazonaws.com/sentinel-s2-l2a-cogs/2020/S2A_34SGA_20200318_0_L2A/B05.tif --config GDAL_DISABLE_READDIR_ON_OPEN=EMPTY_DIR

Blue lines represent the mercator grid for a specific zoom level and the red lines represent the internal tiles bounds

We can then click on a mercator tile and see how much requests GDAL/RASTERIO does.

Contribution & Development

Issues and pull requests are more than welcome.

dev install

$ git clone https://github.com/developmentseed/tilebench.git
$ cd tilebench
$ pip install -e .[dev]

Python >=3.7 only

This repo is set to use pre-commit to run isort, flake8, pydocstring, black ("uncompromising Python code formatter") and mypy when committing new code.

$ pre-commit install

$ git add .

$ git commit -m'my change'
isort....................................................................Passed
black....................................................................Passed
Flake8...................................................................Passed
Verifying PEP257 Compliance..............................................Passed
mypy.....................................................................Passed

$ git push origin