Added xarrays-spatial and updated geoviews link (#4262)

Author: jbednar

doc/related-projects.rst

@@ -38,6 +38,7 @@ Geosciences
   harmonic wind analysis in Python.
 - `wrf-python <https://wrf-python.readthedocs.io/>`_: A collection of diagnostic and interpolation routines for use with output of the Weather Research and Forecasting (WRF-ARW) Model.
 - `xarray-simlab <https://xarray-simlab.readthedocs.io>`_: xarray extension for computer model simulations.
+- `xarray-spatial <https://makepath.github.io/xarray-spatial>`_: Numba-accelerated raster-based spatial processing tools (NDVI, curvature, zonal-statistics, proximity, hillshading, viewshed, etc.)
 - `xarray-topo <https://gitext.gfz-potsdam.de/sec55-public/xarray-topo>`_: xarray extension for topographic analysis and modelling.
 - `xbpch <https://github.com/darothen/xbpch>`_: xarray interface for bpch files.
 - `xclim <https://xclim.readthedocs.io/>`_: A library for calculating climate science indices with unit handling built from xarray and dask.
@@ -75,7 +76,7 @@ Extend xarray capabilities
 
 Visualization
 ~~~~~~~~~~~~~
-- `Datashader <https://datashader.org>`_, `geoviews <http://geo.holoviews.org>`_, `holoviews <http://holoviews.org/>`_, : visualization packages for large data.
+- `datashader <https://datashader.org>`_, `geoviews <http://geoviews.org>`_, `holoviews <http://holoviews.org/>`_, : visualization packages for large data.
 - `hvplot <https://hvplot.pyviz.org/>`_ : A high-level plotting API for the PyData ecosystem built on HoloViews.
 - `psyplot <https://psyplot.readthedocs.io>`_: Interactive data visualization with python.
 - `xarray-leaflet <https://github.com/davidbrochart/xarray_leaflet>`_: An xarray extension for tiled map plotting based on ipyleaflet.