Layers and sources

Sources and layers are used to display raster or vector data on your map.

Sources

Sources state which data the map should display.

import openlayers as ol

geojson = ol.VectorSource(
    url="https://openlayers.org/en/latest/examples/data/geojson/roads-seoul.geojson"
)

geotiff = ol.GeoTIFFSource(
    sources=[{"url": "https://s2downloads.eox.at/demo/EOxCloudless/2020/rgbnir/s2cloudless2020-16bits_sinlge-file_z0-4.tif"}]
)

pmtiles = ol.PMTilesVectorSource(
    url="https://r2-public.protomaps.com/protomaps-sample-datasets/nz-buildings-v3.pmtiles",
    attributions=["© Land Information New Zealand"]
)

See Sources API

Layers

A layer defines how a source is displayed on the map:

import openlayers as ol

data = "https://openlayers.org/en/latest/examples/data/geojson/roads-seoul.geojson"

vector = ol.VectorLayer(
    id="roads",
    source=ol.VectorSource(url=data),
    fit_bounds=True,
)


m = ol.Map(
    ol.View(rotation=3.14 / 8),
    layers=[ol.BasemapLayer(), vector]
)
m.add_default_tooltip()

See Layers API

Styles

Vector layers are styled with an object containing properties for the different styles, such as stroke, fill, circle or icon:

style = ol.FlatStyle(
    stroke_color = "yellow",
    stroke_width = 1.5,
    fill_color = "orange" 
)

It is also possible to use a simple dictonary instead. In this case property names must use hyphens instead of underscores:

const style = {
  "stroke-color": "yellow",
  "stroke-width": 1.5,
  "fill-color": "orange",
}

See Styles API and ol/style/flat for details.