def background_and_pixels(latitudes, longitudes, size, maptype):
"""Queries the proper background map and translate geo coordinated into pixel locations on this map.
:param pandas.Series latitudes: series of sample latitudes
:param pandas.Series longitudes: series of sample longitudes
:param int size: target size of the map, in pixels
:param string maptype: type of maps, see GoogleStaticMapsAPI docs for more info
:return: map and pixels
:rtype: (PIL.Image, pandas.DataFrame)
"""
# From lat/long to pixels, zoom and position in the tile
center_lat = (latitudes.max() + latitudes.min()) / 2
center_long = (longitudes.max() + longitudes.min()) / 2
zoom = GoogleStaticMapsAPI.get_zoom(latitudes, longitudes, size, SCALE)
pixels = GoogleStaticMapsAPI.to_tile_coordinates(latitudes, longitudes, center_lat, center_long, zoom, size, SCALE)
# Google Map
img = GoogleStaticMapsAPI.map(
center=(center_lat, center_long),
zoom=zoom,
scale=SCALE,
size=(size, size),
maptype=maptype,
)
return img, pixels
def plot_markers(markers, maptype=MAPTYPE):
"""Plot markers on a map.
:param pandas.DataFrame markers: DataFrame with at least 'latitude' and 'longitude' columns, and optionally
* 'color' column, see GoogleStaticMapsAPI docs for more info
* 'label' column, see GoogleStaticMapsAPI docs for more info
* 'size' column, see GoogleStaticMapsAPI docs for more info
:param string maptype: type of maps, see GoogleStaticMapsAPI docs for more info
:return: None
"""
# Checking input columns
fields = markers.columns.intersection(['latitude', 'longitude', 'color', 'label', 'size'])
if len(fields) == 0 or 'latitude' not in fields or 'longitude' not in fields:
msg = 'Input dataframe should contain at least colums \'latitude\' and \'longitude\' '
msg += '(and columns \'color\', \'label\', \'size\' optionally).'
raise KeyError(msg)
# Checking NaN input
nans = (markers.latitude.isnull() | markers.longitude.isnull())
if nans.sum() > 0:
warnings.warn('Ignoring {} example(s) containing NaN latitude or longitude.'.format(nans.sum()))
# Querying map
img = GoogleStaticMapsAPI.map(
scale=SCALE,
markers=markers[fields].loc[~nans].T.to_dict().values(),
maptype=maptype,
)
plt.figure(figsize=(10, 10))
plt.imshow(np.array(img))
plt.tight_layout()
plt.axis('off')
plt.show()
def plot_markers(markers, maptype=MAPTYPE):
"""Plot markers on a map.
:param pandas.DataFrame markers: DataFrame with at least 'latitude' and 'longitude' columnns, and optionally
* 'color' column, see GoogleStaticMapsAPI docs for more info
* 'label' column, see GoogleStaticMapsAPI docs for more info
* 'size' column, see GoogleStaticMapsAPI docs for more info
:param string maptype: type of maps, see GoogleStaticMapsAPI docs for more info
:return: None
"""
img = GoogleStaticMapsAPI.map(scale=SCALE, markers=markers.T.to_dict().values(), maptype=maptype)
plt.figure(figsize=(10, 10))
plt.imshow(np.array(img))
plt.tight_layout()
plt.axis('off')
plt.show()