Generates small PNG maps of Finland with a dot at given coordinates.

minimaps.py

# Generates small maps of Finland with a dot at given coordinates.

import geopandas as gpd
import matplotlib.pyplot as plt
from pyproj import Proj, transform

# Load a GeoJSON file with outline of Finland into a GeoDataFrame
geojson = gpd.read_file('fin.geojson')

def make_map(gdf, lat, lon):
    filename = f"./images/{ lat }_{ lon }.png"
    print(filename)

    # Convert the WGS84 coordinates to the CRS used by the GeoDataFrame
    in_crs = Proj(init='epsg:4326') # WGS84
    out_crs = Proj(gdf.crs)
    x, y = transform(in_crs, out_crs, lon, lat)

    # Plot the GeoDataFrame using matplotlib
    fig, ax = plt.subplots()
    gdf.plot(ax=ax, edgecolor='black', linewidth=0.5, facecolor='none')
    #ax.scatter(x, y, color='#006E8D', s=50) # Petrol blue
    ax.scatter(x, y, color='#dd0000', s=30) # Red
    ax.axis('off')

    # Save the plot as a PNG image with a height of 200 pixels
    fig.set_size_inches(fig.get_size_inches()[0], 200/fig.dpi)
    fig.savefig(filename, dpi=fig.dpi, bbox_inches='tight', pad_inches=0, transparent=True)

# Interval of 0.1
#latitude_values = [x/10 for x in range(600, 611)]
#longitude_values = [x/10 for x in range(240, 251)]

#interval of 1
latitude_values = range(59, 71)
longitude_values = range(19, 33)

for latitude in latitude_values:
    for longitude in longitude_values:
        make_map(geojson, latitude, longitude)

Use GeoJSON from https://gist.github.com/mikkohei13/6c5f5d1c356745f96177b0cdc73f3d4d