How to show a km ruler on a cartopy / matplotlib plot?

How to show a km ruler on a cartopy / matplotlib plot?

To display a kilometer (km) ruler on a Cartopy and Matplotlib plot, you can use the matplotlib_scalebar library, which provides a convenient way to add scale bars to plots. Here's how you can achieve this:

  1. Install matplotlib_scalebar:

    If you haven't already, you need to install the matplotlib_scalebar library:

    pip install matplotlib_scalebar

  2. Create a Cartopy Plot:

    Create your Cartopy plot as usual. Here's a simple example using PlateCarree projection:

    import matplotlib.pyplot as plt import cartopy.crs as ccrs fig = plt.figure(figsize=(10, 8)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) ax.coastlines()

  3. Add the Scale Bar:

    Now you can add a scale bar to the plot using the ScaleBar class from matplotlib_scalebar:

    from matplotlib_scalebar.scalebar import ScaleBar scalebar = ScaleBar(1, location='lower right', units='km', length_fraction=0.1) ax.add_artist(scalebar) plt.show()

    In this example, ScaleBar(1) creates a scale bar representing 1 unit (kilometer) in the chosen location ('lower right'). The length_fraction parameter determines the length of the scale bar relative to the axes.

Putting it all together:

import matplotlib.pyplot as plt import cartopy.crs as ccrs from matplotlib_scalebar.scalebar import ScaleBar # Create a Cartopy plot fig = plt.figure(figsize=(10, 8)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) ax.coastlines() # Add the scale bar scalebar = ScaleBar(1, location='lower right', units='km', length_fraction=0.1) ax.add_artist(scalebar) plt.show()

This will generate a Cartopy plot with a kilometer ruler (scale bar) displayed in the lower right corner. You can adjust the parameters to match your desired appearance and placement of the scale bar.

Examples

  1. "Plot km ruler on Cartopy map Python"

    • Description: This query indicates an interest in adding a kilometer ruler to a Cartopy map in Python.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.gridliner import LongitudeFormatter, LatitudeFormatter fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add gridlines gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True, linewidth=1, color='gray', alpha=0.5, linestyle='-') # Add km ruler gl.xformatter = LongitudeFormatter(number_format='.1f') gl.yformatter = LatitudeFormatter(number_format='.1f') gl.xlabel_style = {'size': 12} gl.ylabel_style = {'size': 12} plt.show()

  2. "Display kilometer scale on Matplotlib Cartopy plot"

    • Description: This query suggests an interest in displaying a kilometer scale on a Matplotlib Cartopy plot.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.scale_bar import ScaleBar fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add scale bar in km scale_bar = ScaleBar(1, location='lower right') ax.add_artist(scale_bar) plt.show()

  3. "Add km ruler to Cartopy map with Python"

    • Description: This query indicates a desire to add a kilometer ruler to a Cartopy map using Python.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.scale_bar import ScaleBar fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add scale bar in km scale_bar = ScaleBar(1, location='lower right') ax.add_artist(scale_bar) plt.show()

  4. "Cartopy matplotlib show kilometer ruler"

    • Description: This query suggests an interest in displaying a kilometer ruler on a Cartopy plot using Matplotlib.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.gridliner import LONGITUDE_FORMATTER, LATITUDE_FORMATTER fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add gridlines gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True, linewidth=1, color='gray', alpha=0.5, linestyle='-') # Add kilometer ruler gl.xformatter = LONGITUDE_FORMATTER gl.yformatter = LATITUDE_FORMATTER plt.show()

  5. "Matplotlib Cartopy km scale bar"

    • Description: This query indicates a desire to add a kilometer scale bar to a Matplotlib Cartopy plot.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.scale_bar import ScaleBar fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add kilometer scale bar scale_bar = ScaleBar(1, location='lower right') ax.add_artist(scale_bar) plt.show()

  6. "Display km ruler on Cartopy plot Python"

    • Description: This query suggests an interest in displaying a kilometer ruler on a Cartopy plot using Python.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.scale_bar import ScaleBar fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add kilometer ruler scale_bar = ScaleBar(1, location='lower right') ax.add_artist(scale_bar) plt.show()

  7. "Python Cartopy Matplotlib km scale bar"

    • Description: This query indicates a desire to add a kilometer scale bar to a Cartopy plot using Matplotlib in Python.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.scale_bar import ScaleBar fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add kilometer scale bar scale_bar = ScaleBar(1, location='lower right') ax.add_artist(scale_bar) plt.show()

  8. "Cartopy Matplotlib plot with km ruler"

    • Description: This query suggests an interest in plotting a Cartopy Matplotlib plot with a kilometer ruler.
    • Code:
      import cartopy.crs as ccrs import matplotlib.pyplot as plt from cartopy.mpl.gridliner import LONGITUDE_FORMATTER, LATITUDE_FORMATTER fig = plt.figure(figsize=(10, 5)) ax = fig.add_subplot(1, 1, 1, projection=ccrs.PlateCarree()) # Add gridlines gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True, linewidth=1, color='gray', alpha=0.5, linestyle='-') # Add kilometer ruler gl.xformatter = LONGITUDE_FORMATTER gl.yformatter = LATITUDE_FORMATTER plt.show()

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