meteoblue-dataset-sdk 1.3.4

Easy access to the meteoblue dataset API

meteoblue Python Dataset SDK

This library simplifies access to the meteoblue dataset API.

In order to use this library you need a meteoblue API key.

Features:

• Fetch any dataset from the meteoblue environmental data archive
• Transparently integrates job queues to query large datasets
• Efficiently transfers data using compressed protobuf messages
• Asynchronous interface to query data in parallel
• Data can be used as simple floating-point arrays. No further formatting required.
• Semantic Versioning: The interface for version 1 is declared stable. Breaking interface changes will be published in version 2.

Example notebooks:

• Basic example
• Using model data, creating graphs and maps
• Using measurement data

Installation

• Ensure that you are using at least Python 3.7 with python --version (Sometimes python3)
• Install the module with pip install 'meteoblue_dataset_sdk >=1.0,<2.0' (Sometimes pip3)

This module will also install the following dependencies automatically:

• aiohttp >=3.9,<4
• protobuf >=5.0,<6
• aiofiles >=24.1.0,<25

Usage

See main.py for a working example. To generate the query JSON it is highly recommended to use the dataset API web interfaces.

import meteoblue_dataset_sdk
import logging

# Display information about the current download state
logging.basicConfig(level=logging.INFO)

query = {
    "units": {
        "temperature": "C",
        "velocity": "km/h",
        "length": "metric",
        "energy": "watts",
    },
    "geometry": {
        "type": "MultiPoint",
        "coordinates": [[7.57327, 47.558399, 279]],
        "locationNames": ["Basel"],
    },
    "format": "protobuf",
    "timeIntervals": ["2019-01-01T+04:00/2019-01-01T+04:00"],
    "timeIntervalsAlignment": "none",
    "queries": [
        {
            "domain": "NEMSGLOBAL",
            "gapFillDomain": None,
            "timeResolution": "hourly",
            "codes": [{"code": 11, "level": "2 m above gnd"}],
        }
    ],
}
client = meteoblue_dataset_sdk.Client(apikey="xxxxxx")
result = client.query_sync(query)
# result is a structured object containing timestamps and data

timeInterval = result.geometries[0].timeIntervals[0]
data = result.geometries[0].codes[0].timeIntervals[0].data

print(timeInterval)
# start: 1546286400
# end: 1546372800
# stride: 3600

NOTE: a UTC offset can be specified in the time interval (in the example: +04:00)

NOTE: timeInterval.end is the first timestamp that is not included anymore in the time interval.

If your code is using async/await, you should use await client.query() instead of client.query_sync(). Asynchronous IO is essential for modern webserver frameworks like Flask or FastAPI.

client = meteoblue_dataset_sdk.Client(apikey="xxxxxx")
result = await client.query(query)

Caching results

If you are training a model and re-run your program multiple times, you can enable caching to store results from the meteoblue dataset SDK on disk. A simple file cache can be enabled with:

import zlib
from meteoblue_dataset_sdk.caching import FileCache

# Cache results for 1 day (86400 seconds)
cache = FileCache(path="./mb_cache", max_age=86400, compression_level=zlib.Z_BEST_SPEED)
client = meteoblue_dataset_sdk.Client(apikey="xxxxxx", cache=cache)

If you want to implement a different cache (e.g. redis or S3), the SDK offers an abstract base class caching.cache.AbstractCache. The required methods are listed here.

Working with timestamps

Time intervals are encoded as a simple start, end and stride unix timestamps. With just a view lines of code, timestamps can be converted to an array of datetime objects:

import datetime as dt

print(timeInterval)
# start: 1546286400
# end: 1546372800
# stride: 3600

timerange = range(timeInterval.start, timeInterval.end, timeInterval.stride)
timestamps = list(map(lambda t: dt.datetime.fromtimestamp(t, dt.timezone.utc), timerange))

This code works well for regular timesteps like hourly, 3-hourly or daily data. Monthly data is unfortunately not regular, and the API returns timestamps as an string array. The following code takes care of all cases and always returns an array of datetime objects. Note that a timezone object different from UTC can be specified to e.g. match the utc offset of the request:

import datetime as dt
import dateutil.parser

def meteoblue_timeinterval_to_timestamps(t, timezone = dt.timezone.utc):
    if len(t.timestrings) > 0:
        def map_ts(time):
            if "-" in time:
                return dateutil.parser.parse(time.partition("-")[0])
            return dateutil.parser.parse(time)

        return list(map(map_ts, t.timestrings))

    timerange = range(t.start, t.end, t.stride)
    return list(map(lambda t: dt.datetime.fromtimestamp(t, timezone), timerange))

query = { ... }
result = client.query_sync(query)
timestamps_utc = meteoblue_timeinterval_to_timestamps(timeInterval)
print(timestamps_utc)
# [datetime.datetime(2018, 12, 31, 20, 0, tzinfo=datetime.timezone.utc),
#  datetime.datetime(2018, 12, 31, 21, 0, tzinfo=datetime.timezone.utc),
#  ...]


timezone = dt.timezone(dt.timedelta(hours=4))
timestamps = meteoblue_timeinterval_to_timestamps(timeInterval, timezone)
print(timestamps)
# [datetime.datetime(2019, 1, 1, 0, 0, tzinfo=datetime.timezone(datetime.timedelta(seconds=14400))),
#  datetime.datetime(2019, 1, 1, 1, 0, tzinfo=datetime.timezone(datetime.timedelta(seconds=14400))),
#  ...]

Working with dataframes

To convert a result from the meteoblue dataset API to pandas dataframe, a few lines of code can help:

import pandas as pd
import numpy as np

def meteoblue_result_to_dataframe(geometry):
    t = geometry.timeIntervals[0]
    timestamps = meteoblue_timeinterval_to_timestamps(t)

    n_locations = len(geometry.lats)
    n_timesteps = len(timestamps)

    df = pd.DataFrame(
        {
            "TIMESTAMP": np.tile(timestamps, n_locations),
            "Longitude": np.repeat(geometry.lons, n_timesteps),
            "Latitude": np.repeat(geometry.lats, n_timesteps),
        }
    )

    for code in geometry.codes:
        name = str(code.code) + "_" + code.level + "_" + code.aggregation
        df[name] = list(code.timeIntervals[0].data)

    return df

query = { ... }
result = client.query_sync(query)
df = meteoblue_result_to_dataframe(result.geometries[0])

Protobuf format

In the background, data is transferred using protobuf and defined as this protobuf structure.

A 10 year hourly data series for 1 location requires 350 kb using protobuf, compared to 1600 kb using JSON. Additionally the meteoblue Python SDK transfers data using gzip which reduces the size to only 87 kb.

More detailed output of the result protobuf object:

geometries {
  domain: "NEMSGLOBAL"
  lats: 47.6665192
  lons: 7.5
  asls: 499.773651
  locationNames: "Basel"
  nx: 1
  ny: 1
  timeResolution: "hourly"
  timeIntervals {
    start: 1546286400
    end: 1546372800
    stride: 3600
  }
  codes {
    code: 11
    level: "2 m above gnd"
    unit: "°C"
    aggregation: "none"
    timeIntervals {
      data: 3.51
      data: 3.4
      data: 3.22
      data: 3.02
      data: 2.89
      data: 2.69
      data: 2.55
      data: 2.38
      data: 2.27
      data: 2.12
      data: 1.99
      data: 1.83
      data: 1.82
      data: 2.1
      data: 2.43
      data: 2.92
      data: 3.72
      data: 3.93
      data: 3.91
      data: 3.53
      data: 3.13
      data: 2.88
      data: 2.65
      data: 2.46
    }
  }
}