libgd-gis
Map Viewport and Bounding Box Configuration
This section explains different ways to define the viewport and final image size when rendering maps with libgd-gis.
Case 1: You know the final map size
BBOX_PARANA_SANTA_FE = [
-61.05,
-32.10,
-60.35,
-31.40
]
map = GD::GIS::Map.new(
bbox: BBOX_PARANA_SANTA_FE,
zoom: 11,
basemap: :esri_satellite,
width: 800,
height: 600
)
Case 2: Automatically fit the map to a GeoJSON
GEOJSON = "data/home_store.geojson"
bbox = GD::GIS::Geometry.bbox_for_image(
GEOJSON,
zoom: 13,
width: 800,
height: 600,
padding_px: 100
)
Case 3: Generate a map from a point and radius
STORE = [-60.69128666, -31.64296384]
bbox = GD::GIS::Geometry.bbox_around_point(
STORE[0],
STORE[1],
radius_km: 0.5
)
Notes
width and height are optional. If omitted, the engine calculates the final image size automatically.
