Download tile layers for use offline

Question

I would like to download tile layers in this form:

{atlas_name}/{z}/{x}/{y}.png

Because I want to use them offline with my leaflet map.

However, I can't find what are the approaches to download such tiles for offline use? Are there some apps for this?

Answer 1

This golang script works like a charm for downloading tiles from WMS servers: https://github.com/Luqqk/wms-tiles-downloader.

To do it in the browser: https://github.com/MazeMap/Leaflet.TileLayer.PouchDBCached as mentioned by https://gis.stackexchange.com/users/104146/tomazicm (@TomazicM)

Answer 2

I created this script in Python, which helped me a lot. Fill in the parameters according to your constraints. I used Thunderforest as a provider. You have to register to get the api_key and then choose the style you want. There is a free version for several requests per month. Feel free to change the URL and use other providers.

import requests
import os
import time

# Define the URL pattern for the Thunderforest Transport Map tile layer
# FILL map_style and api_key
url_pattern = "https://tile.thunderforest.com/<map_style>/{z}/{x}/{y}.png?apikey=<your_api_key>"

# Define the maximum zoom level to retrieve tiles for
max_zoom = 7

# Define the output directory for the downloaded tiles
output_dir = "tiles"

# time in seconds between requests to don't overload the provider
sleep_time = 0.2

# Create the output directory if it doesn't exist
if not os.path.exists(output_dir):
    os.makedirs(output_dir)

# Loop over each zoom level up to the maximum zoom level
for zoom in range(max_zoom + 1):
    # Calculate the number of tiles in the x and y directions at the current zoom level
    num_tiles = 2**zoom

    if not os.path.exists(os.path.join(output_dir, str(zoom))):
        os.makedirs(os.path.join(output_dir, str(zoom)))

    # Loop over each tile in the x and y directions
    for x in range(num_tiles):

        if not os.path.exists(os.path.join(output_dir, str(zoom), str(x))):
            os.makedirs(os.path.join(output_dir, str(zoom), str(x)))

        for y in range( num_tiles):
            # Construct the URL for the current tile
            url = url_pattern.format(z=zoom, x=x, y=y)

            # Send a request to download the tile
            response = requests.get(url)

            # Save the tile to the output directory
            filename = os.path.join(
                os.path.join(output_dir, str(zoom), str(x)), f"{y}.png"
            )
            with open(filename, "wb") as f:
                f.write(response.content)

            # Print a message to indicate progress
            print(f"Downloaded tile {zoom}/{x}/{y}")
            time.sleep(sleep_time)

This is useful for downloading the entire map at a specific zoom level. To give you an estimate, you will download 100Mb of data till Zoom 7, and you will get double the size for the next Zoom level. I hope it helps.

Answer 3

sas.planet is my favorite tool. You will use it forever.

for more info : SAS.Team SAS SAS.Planet

https://php-full-stack.blogspot.com/2019/06/sasteam-sas-sasplanetbin.html