"""
surface - Grids table data using adjustable tension continuous curvature
splines.
"""
from pygmt.clib import Session
from pygmt.helpers import (
GMTTempFile,
build_arg_string,
check_data_input_order,
deprecate_parameter,
fmt_docstring,
kwargs_to_strings,
use_alias,
)
from pygmt.io import load_dataarray
[docs]@fmt_docstring
@deprecate_parameter("outfile", "outgrid", "v0.5.0", remove_version="v0.7.0")
@check_data_input_order("v0.5.0", remove_version="v0.7.0")
@use_alias(
I="spacing",
R="region",
G="outgrid",
V="verbose",
a="aspatial",
b="binary",
d="nodata",
e="find",
f="coltypes",
h="header",
i="incols",
r="registration",
w="wrap",
)
@kwargs_to_strings(R="sequence")
def surface(data=None, x=None, y=None, z=None, **kwargs):
r"""
Grids table data using adjustable tension continuous curvature splines.
Surface reads randomly-spaced (x,y,z) triples and produces gridded values
z(x,y) by solving:
.. math:: (1 - t)\nabla^2(z)+t\nabla(z) = 0
where :math:`t` is a tension factor between 0 and 1, and :math:`\nabla`
indicates the Laplacian operator.
Takes a matrix, xyz triples, or a file name as input.
Must provide either ``data`` or ``x``, ``y``, and ``z``.
Full option list at :gmt-docs:`surface.html`
{aliases}
Parameters
----------
data : str or {table-like}
Pass in (x, y, z) or (longitude, latitude, elevation) values by
providing a file name to an ASCII data table, a 2D
{table-classes}.
x/y/z : 1d arrays
Arrays of x and y coordinates and values z of the data points.
{I}
{R}
outgrid : str
Optional. The file name for the output netcdf file with extension .nc
to store the grid in.
{V}
{a}
{b}
{d}
{e}
{f}
{h}
{i}
{r}
{w}
Returns
-------
ret: xarray.DataArray or None
Return type depends on whether the ``outgrid`` parameter is set:
- :class:`xarray.DataArray`: if ``outgrid`` is not set
- None if ``outgrid`` is set (grid output will be stored in file set by
``outgrid``)
"""
with GMTTempFile(suffix=".nc") as tmpfile:
with Session() as lib:
# Choose how data will be passed into the module
file_context = lib.virtualfile_from_data(
check_kind="vector", data=data, x=x, y=y, z=z, required_z=True
)
with file_context as infile:
if "G" not in kwargs: # if outgrid is unset, output to tmpfile
kwargs.update({"G": tmpfile.name})
outgrid = kwargs["G"]
arg_str = " ".join([infile, build_arg_string(kwargs)])
lib.call_module(module="surface", args=arg_str)
return load_dataarray(outgrid) if outgrid == tmpfile.name else None