These work very similarly to their standard Matplotlib counterparts, but have an additional Boolean argument latlon, which if set to True allows you to pass raw latitudes and longitudes to the method, rather than projected (x, y) coordinates.Ĭontour() / contourf() : Draw contour lines or filled contours In addition to this, there are many map-specific functions available as methods of the Basemap instance. For simple plotting and text, any plt function works on the map you can use the Basemap instance to project latitude and longitude coordinates to (x, y) coordinates for plotting with plt, as we saw earlier in the Seattle example. Perhaps the most useful piece of the Basemap toolkit is the ability to over-plot a variety of data onto a map background.
We'll create both a low- and high-resolution map of Scotland's beautiful Isle of Skye. Here's an example of drawing land/sea boundaries, and the effect of the resolution parameter.
This choice is important: setting high-resolution boundaries on a global map, for example, can be very slow. The resolution argument of the Basemap class sets the level of detail in boundaries, either 'c' (crude), 'l' (low), 'i' (intermediate), 'h' (high), 'f' (full), or None if no boundaries will be used. Warpimage() : Project a user-provided image onto the mapįor the boundary-based features, you must set the desired resolution when creating a Basemap image. Shadedrelief() : Project a shaded relief image onto the mapĮtopo() : Draw an etopo relief image onto the map The following are some of the available drawing functions that you may wish to explore using IPython's help features:ĭrawcoastlines() : Draw continental coast linesĭrawlsmask() : Draw a mask between the land and sea, for use with projecting images on one or the otherĭrawmapboundary() : Draw the map boundary, including the fill color for oceans.įillcontinents() : Fill the continents with a given color optionally fill lakes with another colorĭrawcountries() : Draw country boundariesĭrawcounties() : Draw US county boundariesĭrawgreatcircle() : Draw a great circle between two pointsĭrawparallels() : Draw lines of constant latitudeĭrawmeridians() : Draw lines of constant longitudeĭrawmapscale() : Draw a linear scale on the mapīluemarble() : Project NASA's blue marble image onto the map The Basemap package contains a range of useful functions for drawing borders of physical features like continents, oceans, lakes, and rivers, as well as political boundaries such as countries and US states and counties. Earlier we saw the bluemarble() and shadedrelief() methods for projecting global images on the map, as well as the drawparallels() and drawmeridians() methods for drawing lines of constant latitude and longitude.
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