Source code for pygmt.src.blockmedian

"""
blockmedian - Block average (x,y,z) data tables by median estimation.
"""
import pandas as pd
from pygmt.clib import Session
from pygmt.exceptions import GMTInvalidInput
from pygmt.helpers import (
    GMTTempFile,
    build_arg_string,
    data_kind,
    dummy_context,
    fmt_docstring,
    kwargs_to_strings,
    use_alias,
)


[docs]@fmt_docstring @use_alias(I="spacing", R="region", V="verbose") @kwargs_to_strings(R="sequence") def blockmedian(table, outfile=None, **kwargs): r""" Block average (x,y,z) data tables by median estimation. Reads arbitrarily located (x,y,z) triples [or optionally weighted quadruples (x,y,z,w)] from a table and writes to the output a median position and value for every non-empty block in a grid region defined by the region and spacing arguments. Full option list at :gmt-docs:`blockmedian.html` {aliases} Parameters ---------- table : pandas.DataFrame or str Either a pandas dataframe with (x, y, z) or (longitude, latitude, elevation) values in the first three columns, or a file name to an ASCII data table. spacing : str *xinc*\[\ *unit*\][**+e**\|\ **n**] [/*yinc*\ [*unit*][**+e**\|\ **n**]]. *xinc* [and optionally *yinc*] is the grid spacing. region : str or list *xmin/xmax/ymin/ymax*\[\ **+r**\][**+u**\ *unit*]. Specify the region of interest. outfile : str Required if ``table`` is a file. The file name for the output ASCII file. {V} Returns ------- output : pandas.DataFrame or None Return type depends on whether the ``outfile`` parameter is set: - :class:`pandas.DataFrame` table with (x, y, z) columns if ``outfile`` is not set - None if ``outfile`` is set (filtered output will be stored in file set by ``outfile``) """ kind = data_kind(table) with GMTTempFile(suffix=".csv") as tmpfile: with Session() as lib: if kind == "matrix": if not hasattr(table, "values"): raise GMTInvalidInput(f"Unrecognized data type: {type(table)}") file_context = lib.virtualfile_from_matrix(table.values) elif kind == "file": if outfile is None: raise GMTInvalidInput("Please pass in a str to 'outfile'") file_context = dummy_context(table) else: raise GMTInvalidInput(f"Unrecognized data type: {type(table)}") with file_context as infile: if outfile is None: outfile = tmpfile.name arg_str = " ".join([infile, build_arg_string(kwargs), "->" + outfile]) lib.call_module(module="blockmedian", args=arg_str) # Read temporary csv output to a pandas table if outfile == tmpfile.name: # if user did not set outfile, return pd.DataFrame result = pd.read_csv(tmpfile.name, sep="\t", names=table.columns) elif outfile != tmpfile.name: # return None if outfile set, output in outfile result = None return result