Demo downloading weather data to xarray using wxee.

What is wxee?

wxee was built to make processing gridded, mesoscale time series data quick and easy by integrating the data catalog and processing power of Google Earth Engine with the flexibility of xarray, with no complicated setup required. To accomplish this, wxee implements convenient methods for data processing, aggregation, downloading, and ingestion.

wxee can be found in the Earth Engine Developer Resources!

Features

Time series image collections to xarray or GeoTIFF in one line of code
Climatological anomalies and temporal aggregation, interpolation, smoothing, and gap-filling in Earth Engine
Color composite plots from xarray datasets
Parallel processing for fast downloads

To see some of the capabilities of wxee and try it yourself, check out the interactive notebooks here!

Install

Pip

pip install wxee

Conda

conda install -c conda-forge wxee

Quickstart

Setup

Once you have access to Google Earth Engine, just import and initialize ee and wxee.

import ee
import wxee

wxee.Initialize()

Download Images

Download and conversion methods are extended to ee.Image and ee.ImageCollection using the wx accessor. Just import wxee and use the wx accessor.

xarray

ee.ImageCollection("IDAHO_EPSCOR/GRIDMET").wx.to_xarray()

GeoTIFF

ee.ImageCollection("IDAHO_EPSCOR/GRIDMET").wx.to_tif()

Create a Time Series

Additional methods for processing image collections in the time dimension are available through the TimeSeries subclass. A TimeSeries can be created from an existing ee.ImageCollection…

col = ee.ImageCollection("IDAHO_EPSCOR/GRIDMET")
ts = col.wx.to_time_series()

Or instantiated directly just like you would an ee.ImageCollection!

ts = wxee.TimeSeries("IDAHO_EPSCOR/GRIDMET")

Aggregate Daily Data

Many weather datasets are in daily or hourly resolution. These can be aggregated to coarser resolutions using the aggregate_time method of the TimeSeries class.

ts = wxee.TimeSeries("IDAHO_EPSCOR/GRIDMET")
monthly_max = ts.aggregate_time(frequency="month", reducer=ee.Reducer.max())

Calculate Climatological Means

Long-term climatological means can be calculated using the climatology_mean method of the TimeSeries class.

ts = wxee.TimeSeries("IDAHO_EPSCOR/GRIDMET")
mean_clim = ts.climatology_mean(frequency="month")

Contribute

Bugs or feature requests are always appreciated! They can be submitted here.

Code contributions are also welcome! Please open an issue to discuss implementation, then follow the steps below. Developer setup instructions can be found in the docs.

Contents

Index