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About App Examples GitHub
Core Operations
  • Buffer / Dissolve Vancouver bike walksheds - 200m buffer around bikeways with dissolve.
  • Intersection / Clip San Francisco bike routes intersected with parks - filter and clip modes compared.
  • Union / Merge Portland neighbourhoods merged with development opportunity areas - merge and dissolve modes compared.
  • Difference Ottawa neighbourhoods minus parks and greenspaces - subtract and exclude modes compared.
  • Contains / Within Winnipeg cycling network checked against parks - filter and within modes compared.
  • Distance (Filter) Chicago parks within walking distance of L rail stations.
  • Distance (Annotate) Calgary bikeways colored by distance to nearest LRT station.
  • Centroid Denver park polygons reduced to centroid points.
Labels
  • Labels Calgary communities and LRT stations with text labels - style.labelField for simple labels, type: symbol for full MapLibre expression control.
Expression Styling
  • Interpolate Styling Vancouver parks colored by size - interpolate expression mapping hectares to a green color ramp.
  • Match Styling Victoria road network colored by classification - match expression mapping road classes to a color palette.
Advanced Workflows
  • Multi-Dataset Layers Surrey, Burnaby, and New Westminster parks and active transportation - seven datasets across three municipalities with expression styling.
  • Multi-Step Workflow Edmonton schools + transit - union, buffer, and intersection chained to find dual-access zones.
  • Attribute Filter Vancouver cycling network filtered by infrastructure quality - safer routes via advanced SQL filter, protected lanes via structured filter, walkshed coverage buffered from the result.
deck.gl
  • deck.gl Meteorite Landings NASA meteorite landings rendered with deck.gl GeoJsonLayer - 45,000+ recorded impacts visualized from GeoParquet.
PMTiles
  • PMTiles Vector Tiles Protomaps worldwide vector basemap loaded as a PMTiles dataset - nine source layers styled independently with explicit layer configs.
About App GitHub 
# Artemyx Example - Contains / Within
# Winnipeg parks checked against the city cycling network.
#
# Two operations show the behavioral difference:
#   filter - keeps park polygons that fully contain at least one cycling segment
#   within - keeps cycling segments that fall entirely inside a park boundary

map:
  center: [-97.1384, 49.8951]  # Winnipeg, MB
  zoom: 12
  basemap: carto-dark

datasets:
  - id: parks
    url: "https://data.winnipeg.ca/resource/tx3d-pfxq.geojson"
    name: Winnipeg Parks and Open Spaces
    color: "#22c55e"

  - id: cycling_network
    url: "https://data.winnipeg.ca/resource/kjd9-dvf5.geojson"
    name: Winnipeg Cycling Network
    color: "#f59e0b"

operations:
  # filter: parks that fully contain at least one cycling segment
  - type: contains
    inputs: [parks, cycling_network]
    output: parks_with_cycling
    name: Parks With Cycling
    params:
      mode: filter
    color: "#38bdf8"

  # within: cycling segments that fall entirely inside a park boundary
  - type: contains
    inputs: [parks, cycling_network]
    output: cycling_in_parks
    name: Cycling In Parks
    params:
      mode: within
    color: "#a78bfa"

layers:
  # All parks - faint green context
  - id: parks-fill
    source: parks
    tooltip: park_name
    type: fill
    paint:
      fill-color: "#22c55e"
      fill-opacity: 0.06

  - id: parks-outline
    source: parks
    type: line
    paint:
      line-color: "#22c55e"
      line-width: 1
      line-opacity: 0.35

  # Full cycling network - faint amber context
  - id: cycling-line
    source: cycling_network
    type: line
    paint:
      line-color: "#f59e0b"
      line-width: 1.5
      line-opacity: 0.25

  # Filter result - parks that contain a complete cycling segment (sky blue)
  - id: parks-with-cycling-fill
    source: parks_with_cycling
    tooltip: park_name
    type: fill
    paint:
      fill-color: "#38bdf8"
      fill-opacity: 0.15

  - id: parks-with-cycling-outline
    source: parks_with_cycling
    type: line
    paint:
      line-color: "#38bdf8"
      line-width: 2
      line-opacity: 0.8

  # Within result - cycling segments fully inside a park (purple, on top)
  - id: cycling-in-parks-line
    source: cycling_in_parks
    type: line
    paint:
      line-color: "#a78bfa"
      line-width: 3
      line-opacity: 0.9