Animate a line

This source code of this example is adapted from the MapLibre GL JS example - Animate a line.

Uncomment the following line to install leafmap if needed.

In [1]:

# %pip install "leafmap[maplibre]"

# %pip install "leafmap[maplibre]"

In [2]:

import time
import pandas as pd
import leafmap.maplibregl as leafmap

import time import pandas as pd import leafmap.maplibregl as leafmap

To run this notebook, you will need an API key from MapTiler. Once you have the API key, you can uncomment the following code block and replace YOUR_API_KEY with your actual API key. Then, run the code block code to set the API key as an environment variable.

In [3]:

# import os
# os.environ["MAPTILER_KEY"] = "YOUR_API_KEY"

# import os # os.environ["MAPTILER_KEY"] = "YOUR_API_KEY"

In [4]:

url = "https://github.com/opengeos/datasets/releases/download/world/animated_line_data.csv"
df = pd.read_csv(url)
df_sample = df.sample(n=1000, random_state=1).sort_index()
df_sample.loc[len(df_sample)] = df.iloc[-1]
df_sample.head()

url = "https://github.com/opengeos/datasets/releases/download/world/animated_line_data.csv" df = pd.read_csv(url) df_sample = df.sample(n=1000, random_state=1).sort_index() df_sample.loc[len(df_sample)] = df.iloc[-1] df_sample.head()

Out[4]:

	x	y
38	1.266667	3.532592
44	1.466667	4.088553
45	1.500000	4.181139
58	1.933333	5.382508
82	2.733333	7.586668

In [5]:

m = leafmap.Map(center=[0, 0], zoom=0.5, style="streets")
geojson = {
    "type": "FeatureCollection",
    "features": [
        {"type": "Feature", "geometry": {"type": "LineString", "coordinates": [[0, 0]]}}
    ],
}
source = {"type": "geojson", "data": geojson}
m.add_source("line", source)
layer = {
    "id": "line-animation",
    "type": "line",
    "source": "line",
    "layout": {"line-cap": "round", "line-join": "round"},
    "paint": {"line-color": "#ed6498", "line-width": 5, "line-opacity": 0.8},
}
m.add_layer(layer)
m

m = leafmap.Map(center=[0, 0], zoom=0.5, style="streets") geojson = { "type": "FeatureCollection", "features": [ {"type": "Feature", "geometry": {"type": "LineString", "coordinates": [[0, 0]]}} ], } source = {"type": "geojson", "data": geojson} m.add_source("line", source) layer = { "id": "line-animation", "type": "line", "source": "line", "layout": {"line-cap": "round", "line-join": "round"}, "paint": {"line-color": "#ed6498", "line-width": 5, "line-opacity": 0.8}, } m.add_layer(layer) m

Failed to retrieve the MapTiler style. Defaulting to OpenFreeMap 'liberty' style.

In [6]:

run_times = 2
for i in range(run_times):
    geojson["features"][0]["geometry"]["coordinates"] = [[0, 0]]
    for row in df_sample.itertuples():
        time.sleep(0.005)
        geojson["features"][0]["geometry"]["coordinates"].append([row.x, row.y])
        m.set_data("line", geojson)

run_times = 2 for i in range(run_times): geojson["features"][0]["geometry"]["coordinates"] = [[0, 0]] for row in df_sample.itertuples(): time.sleep(0.005) geojson["features"][0]["geometry"]["coordinates"].append([row.x, row.y]) m.set_data("line", geojson)