Casper - static map generator for dynamic data

Casper generates static map images from hybrid map sources (e.g. raster tiles and mapbox vector tiles) and geojson data from postgres.

Build and run

go build . && ./casper

CLI Arguments

• id: The flight id in the weglide DB
• th: Thickness of line string

Test Cases

go test

The test cases cover the following scenarios (can be executed without a connection to a weglide DB):

• Flight from Berlin to New York
• Flight from Berlin to Hamburg
• Flight from Berlin to Barcelona
• Flight from Berlin to Rio
• Flight from Frankfurt to Marburg

Prepare Development

1. Clone the wg_main repository

2. Start all the services

3. Make sure that you expose the postgres database with a port mapping: e.g.

   ports:  
     - 5432:5432
   

   With this approach you can connect during the development to the database and don't have to create a docker container separately just to connect to the database.

4. Define the following environment variables:

    export LOCAL=TRUE
    export POSTGRES_HOST=127.0.0.1
    export POSTGRES_DB=weglide
    export POSTGRES_USER=weglide_user
    export POSTGRES_PASS=test
    export POSTGRES_PORT=5432
   

• Canvas starts at top left corner!

Example Image

Data flow

1. Get Flight ID
2. Get bbox (bounding box) and linestring from weglide DB
3. Calculate required tiles based on bbox
4. Download tiles
5. Merge all downloaded tiles to one image
6. Plot flight
7. Crop image