Update example for geopandas line geometry using Natural Earth dataset (#4229)

Author: yvonnefroehlich

examples/gallery/lines/linestrings.py

@@ -4,43 +4,28 @@
 
 The :meth:`pygmt.Figure.plot` method allows us to plot geographical data such as lines
 with LineString or MultiLineString geometry types stored in a
-:class:`geopandas.GeoDataFrame` object or any object that implements the
-`__geo_interface__ <https://gist.github.com/sgillies/2217756>`__ property.
-
-Use :func:`geopandas.read_file` to load data from any supported OGR format such as a
-shapefile (.shp), GeoJSON (.geojson), geopackage (.gpkg), etc. Then, pass the
-:class:`geopandas.GeoDataFrame` object as an argument to the ``data`` parameter of
-:meth:`pygmt.Figure.plot`, and style the lines using the ``pen`` parameter.
+:class:`geopandas.GeoDataFrame` object. Use :func:`geopandas.read_file` to load data
+from any supported OGR format such as a shapefile (.shp), GeoJSON (.geojson), geopackage
+(.gpkg), etc. Then, pass the :class:`geopandas.GeoDataFrame` object as an argument to
+the ``data`` parameter of :meth:`pygmt.Figure.plot`, and style the lines using the
+``pen`` parameter.
 """
 
 # %%
-import geodatasets
 import geopandas as gpd
 import pygmt
 
-# Read a sample dataset provided by the geodatasets package.
-# The dataset contains large rivers in Europe, stored as LineString/MultiLineString
-# geometry types.
-gdf = gpd.read_file(geodatasets.get_path("eea large_rivers"))
-
-# Convert object to EPSG 4326 coordinate system
-gdf = gdf.to_crs("EPSG:4326")
-gdf.head()
+# Read a sample dataset provided by Natural Earth. The dataset contains rivers stored
+# as LineString/MultiLineString geometry types. Here will focus on Asia.
+provider = "https://naciscdn.org/naturalearth"
+rivers = gpd.read_file(f"{provider}/50m/physical/ne_50m_rivers_lake_centerlines.zip")
+rivers_asia = rivers.cx[57:125, 7:47].copy()
 
-# %%
 fig = pygmt.Figure()
-
-fig.coast(
-    projection="M10c",
-    region=[-10, 30, 35, 57],
-    resolution="l",
-    land="gray95",
-    shorelines="1/0.1p,gray50",
-    borders="1/0.1,gray30",
-    frame=True,
-)
+fig.basemap(region=[57, 125, 7, 47], projection="M10c", frame=True)
+fig.coast(land="gray95", shorelines="1/0.3p,gray50")
 
 # Add rivers to map
-fig.plot(data=gdf, pen="1p,steelblue")
+fig.plot(data=rivers_asia, pen="1p,steelblue")
 
 fig.show()