CLI: initial AQS support

melodies_monet/_cli.py

@@ -7,6 +7,7 @@
 import time
 from contextlib import contextmanager
 from pathlib import Path
+from typing import List
 
 try:
     import typer
@@ -914,6 +915,250 @@ def get_utc_offset(*, lat, lon):
             ds.to_netcdf(dst / out_name)
 
 
+@app.command()
+def get_aqs(
+    start_date: str = typer.Option(..., "-s", "--start-date", help=f"Start date. {_DATE_FMT_NOTE}"),
+    end_date: str = typer.Option(..., "-e", "--end-date", help=f"End date. {_DATE_FMT_NOTE} {_DATE_END_NOTE}"),
+    daily: bool = typer.Option(False, help=(
+            "Whether to retrieve the daily averaged data product. "
+            "By default, the hourly data is fetched."
+        )
+    ),
+    param: List[str] = typer.Option(["O3", "PM2.5", "PM10"], "-p", "--params", help=(
+            "Parameter groups. "
+            "Use '-p' more than once to get multiple groups. "
+            "Other examples: 'SPEC' (speciated PM2.5), 'PM10SPEC' (speciated PM10), "
+            "'VOC', 'NONOxNOy', 'SO2', 'NO2', 'CO', 'PM2.5_FRM'."
+        )
+    ),
+    # TODO: add network selection option once working in monetio
+    out_name: str = typer.Option(None, "-o",
+        help=(
+            "Output file name (or full/relative path). "
+            "By default the name is generated like 'AQS_<start-date>_<end-date>.nc'."
+        )
+    ),
+    dst: Path = typer.Option(".", "-d", "--dst", help=(
+            "Destination directory (to control output location "
+            "if using default output file name)."
+        )
+    ),
+    compress: bool = typer.Option(True, help=(
+            "If true, pack float to int and apply compression using zlib with complevel 7. "
+            "This can take time if the dataset is large, but can lead to "
+            "significant space savings."
+        )
+    ),
+    num_workers: int = typer.Option(1, "-n", "--num-workers", help="Number of download workers."),
+    verbose: bool = typer.Option(False),
+    debug: bool = typer.Option(
+        False, "--debug/", help="Print more messages (including full tracebacks)."
+    ),
+):
+    """Download EPA AQS data using monetio and reformat for MM usage.
+
+    These are archived data, stored in per-year per-parameter-group files, described at
+    https://aqs.epa.gov/aqsweb/airdata/download_files.html
+
+    Recent-past data are generally not available from this source.
+    """
+    import warnings
+
+    import monetio as mio
+    import pandas as pd
+
+    from .util.write_util import write_ncf
+
+    global DEBUG
+
+    DEBUG = debug
+
+    if verbose:
+        from dask.diagnostics import ProgressBar
+
+        ProgressBar().register()
+
+    typer.echo(HEADER)
+
+    start_date = pd.Timestamp(start_date)
+    end_date = pd.Timestamp(end_date)
+    dates = pd.date_range(start_date, end_date, freq="H" if not daily else "D")
+    if verbose:
+        print("Dates:")
+        print(dates)
+        print("Params:")
+        print(param)
+
+    # Set destination and file name
+    fmt = r"%Y%m%d"
+    if out_name is None:
+        out_name = f"AQS_{start_date:{fmt}}_{end_date:{fmt}}.nc"
+    else:
+        p = Path(out_name)
+        if p.name == out_name:
+            # `out_name` is just the file name
+            out_name = p.name
+        else:
+            # `out_name` has path
+            if dst != Path("."):
+                typer.echo(f"warning: overriding `dst` setting {dst.as_posix()!r} with `out_name` {p.as_posix()!r}")
+            dst = p.parent
+            out_name = p.name
+
+    with _timer("Fetching data with monetio"):
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                "ignore",
+                message="The (error|warn)_bad_lines argument has been deprecated"
+            )
+            try:
+                df = mio.aqs.add_data(
+                    dates,
+                    param=param,
+                    daily=daily,
+                    network=None,
+                    download=False,
+                    local=False,
+                    wide_fmt=True,  # column for each variable
+                    n_procs=num_workers,
+                    meta=False,  # TODO: enable or add option once monetio fixes released
+                )
+            except KeyError as e:
+                if daily and str(e) == "'time'":
+                    typer.echo("Note that the daily option currently requires monetio >0.2.5")
+                raise
+
+    if not daily:
+        with _timer("Fetching site metadata"):
+            # Need UTC offset in order to compute local time
+            # But currently the `meta=True` option doesn't work
+            meta0 = pd.read_csv(
+                "https://aqs.epa.gov/aqsweb/airdata/aqs_sites.zip",
+                encoding="ISO-8859-1",
+                usecols=[0, 1, 2, 17],
+                dtype=str,
+            )
+            meta = (
+                meta0.copy()
+                .assign(
+                    siteid=meta0["State Code"] + meta0["County Code"] + meta0["Site Number"],
+                    utcoffset=meta0["GMT Offset"].astype(int),
+                )
+                .drop(
+                    columns=["State Code", "County Code", "Site Number", "GMT Offset"],
+                )
+            )
+
+    with _timer("Forming xarray Dataset"):
+        # Select requested time period (older monetio doesn't do this)
+        df = df[df.time.between(dates[0], dates[-1], inclusive="both")]
+
+        df = df.dropna(subset=["latitude", "longitude"])
+
+        # Variables associated with a measurement,
+        # currently not properly useful in the wide format.
+        if daily:
+            v_vns = [
+                "parameter_code",
+                "poc",
+                "parameter_name",
+                "sample_duration",
+                "pollutant_standard",
+                "event_type",
+                "observation_count",
+                "observation_percent",
+                "1st_max_value",
+                "1st_max_hour",
+                "aqi",
+                "method_code",
+                "method_name",
+            ]
+        else:
+            v_vns = [
+                "parameter_code",
+                "poc",  # parameter occurrence code
+                "parameter_name",
+                "mdl",  # method detection limit
+                "uncertainty",
+                "method_type",
+                "method_code",
+                "method_name",
+            ]
+        df = df.drop(columns=v_vns).drop_duplicates()
+        # TODO: may be better to get long fmt and drop these first and then pivot
+        # TODO: option to average duplicate measurements at same site instead of keeping first?
+        if "datum" in df:
+            df = df.drop(columns=["datum"])
+
+        site_vns = [
+            "siteid",
+            "state_code",
+            "county_code",
+            "site_num",
+            "latitude",
+            "longitude",
+        ]
+        if daily:
+            site_vns.extend(["local_site_name", "address", "city_name", "msa_name"])
+        # NOTE: time_local not included since it varies in time as well
+        if not daily:
+            df = df.merge(meta, on="siteid", how="left")
+            site_vns.append("utcoffset")
+
+        ds_site = (
+            df[site_vns]
+            .groupby("siteid")
+            .first()
+            .to_xarray()
+            .swap_dims(siteid="x")
+        )
+
+        # Extract units info so we can add as attrs
+        unit_suff = "_unit"
+        unit_cols = [n for n in df.columns if n.endswith(unit_suff)]
+        assert (df[unit_cols].nunique() == 1).all()
+        units = df[unit_cols][~df[unit_cols].isnull()].iloc[0].to_dict()
+
+        cols = [n for n in df.columns if not n.endswith(unit_suff)]
+        ds = (
+            df[cols]
+            .drop(columns=[vn for vn in site_vns if vn != "siteid"])
+            .drop_duplicates(["time", "siteid"], keep="first")
+            .set_index(["time", "siteid"])
+            .to_xarray()
+            .swap_dims(siteid="x")
+            .merge(ds_site)
+            .set_coords(["latitude", "longitude"])
+            .assign(x=range(ds_site.dims["x"]))
+        )
+
+        # Add units
+        for k, u in units.items():
+            vn = k[:-len(unit_suff)]
+            ds[vn].attrs.update(units=u)
+
+        # Fill in local time array
+        # (in the df, not all sites have rows for all times, so we have NaTs at this point)
+        if not daily:
+            ds["time_local"] = ds.time + ds.utcoffset.astype("timedelta64[h]")
+
+        # Expand
+        ds = (
+            ds
+            .expand_dims("y")
+            .transpose("time", "y", "x")
+        )
+
+        # Can't have `/` in variable name for netCDF
+        to_rename = [vn for vn in ds.data_vars if "/" in vn]
+        ds = ds.rename_vars({vn: vn.replace("/", "_") for vn in to_rename})
+
+    with _timer("Writing netCDF file"):
+        if compress:
+            write_ncf(ds, dst / out_name, verbose=verbose)
+        else:
+            ds.to_netcdf(dst / out_name)
+
 
 cli = app
 

melodies_monet/tests/test_get_data_cli.py

@@ -114,3 +114,44 @@ def test_get_ish_box(tmp_path):
 
     assert ds.time.size == 24
     assert np.unique(ds.state) == ["CO"]
+
+
+def test_get_aqs_daily(tmp_path):
+    fn = "x.nc"
+    cmd = [
+        "melodies-monet", "get-aqs",
+        "-s", "2019-08-01", "-e", "2019-08-02",
+        "-p", "O3",
+        "--daily",
+        "--dst", tmp_path.as_posix(), "-o", fn,
+    ]
+    subprocess.run(cmd, check=True)
+
+    ds = xr.open_dataset(tmp_path / fn)
+
+    assert ds.time.size == 2, "two days"
+    assert {
+        v
+        for v in ds.data_vars
+        if ds[v].dims == ("time", "y", "x")
+    } == {"OZONE"}
+
+
+def test_get_aqs_hourly(tmp_path):
+    fn = "x.nc"
+    cmd = [
+        "melodies-monet", "get-aqs",
+        "-s", "1980-08-01", "-e", "1980-08-01 23:00",
+        "-p", "O3",
+        "--dst", tmp_path.as_posix(), "-o", fn,
+    ]
+    subprocess.run(cmd, check=True)
+
+    ds = xr.open_dataset(tmp_path / fn)
+
+    assert ds.time.size == 24, "one day"
+    assert {
+        v
+        for v in ds.data_vars
+        if ds[v].dims == ("time", "y", "x")
+    } == {"OZONE", "time_local"}