{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# Xarray Fundamentals\n", "\n", "*This material is adapted from the [Earth and Environmental Data Science](https://earth-env-data-science.github.io/intro.html), from Ryan Abernathey (Columbia University)*." ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Xarray data structures\n", "\n", "\n", ":::{important}\n", "Like Pandas, xarray has two fundamental data structures:\n", "* a `DataArray`, which holds a single multi-dimensional variable and its coordinates\n", "* a `Dataset`, which holds multiple variables that potentially share the same coordinates\n", ":::\n", "\n", "### DataArray\n", "\n", "A `DataArray` has four essential attributes:\n", "* `values`: a `numpy.ndarray` holding the array’s values\n", "* `dims`: dimension names for each axis (*e.g.*, `('x', 'y', 'z')`)\n", "* `coords`: a dict-like container of arrays (coordinates) that label each point (e.g., 1-dimensional arrays of numbers, datetime objects or strings)\n", "* `attrs`: an `OrderedDict` to hold arbitrary metadata (attributes)\n", "\n", "Let's start by constructing some DataArrays manually " ] }, { "cell_type": "code", "execution_count": 107, "metadata": { "tags": [] }, "outputs": [], "source": [ "import numpy as np\n", "import xarray as xr\n", "\n", "from matplotlib import pyplot as plt\n", "# %config InlineBackend.figure_format = 'retina'\n", "plt.ion() # To trigger the interactive inline mode\n", "\n", "plt.rcParams['figure.figsize'] = (6,5)" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "A simple DataArray without dimensions or coordinates isn't much use." ] }, { "cell_type": "code", "execution_count": 108, "metadata": {}, "outputs": [ { "data": { "text/html": [ "
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array(['2020-03-01T14:00:00.000000000', '2020-03-02T14:00:00.000000000',\n", " '2020-03-03T14:00:00.000000000', '2020-03-04T14:00:00.000000000',\n", " '2020-03-05T14:00:00.000000000', '2020-03-06T14:00:00.000000000',\n", " '2020-03-07T14:00:00.000000000', '2020-03-08T14:00:00.000000000',\n", " '2020-03-09T14:00:00.000000000', '2020-03-10T14:00:00.000000000',\n", " '2020-03-11T14:00:00.000000000', '2020-03-12T14:00:00.000000000',\n", " '2020-03-13T14:00:00.000000000', '2020-03-14T14:00:00.000000000'],\n", " dtype='datetime64[ns]')
array([-28.696022, -28.666022, -28.636022, ..., -7.096022, -7.066022,\n", " -7.036022])
array([142.168788, 142.198788, 142.228788, ..., 156.808788, 156.838788,\n", " 156.868788])
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