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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 - Intersection (Filter + Clip)
# SF bike routes intersected with park/open space polygons.
#
# Two operations on the same datasets show the behavioral difference:
#   filter - keeps whole bike segments that touch any park (full geometry preserved)
#   clip   - trims bike routes to the exact park boundary (only in-park geometry)

map:
  center: [-122.4194, 37.7749]  # San Francisco, CA
  zoom: 13
  basemap: carto-dark

datasets:
  - id: bike_routes
    url: "https://data.sfgov.org/resource/ta46-stby.geojson"
    name: SF Bike Routes
    color: "#22c55e"

  - id: parks
    url: "https://data.sfgov.org/resource/gtr9-ntp6.geojson?$where=city='San Francisco'"
    name: SF Parks & Open Space
    color: "#a78bfa"

operations:
  # filter: whole segments that touch a park (even if they extend outside)
  - type: intersection
    inputs: [bike_routes, parks]
    output: bike_routes_near_parks
    name: Bike Routes Near Parks
    params:
      mode: filter
    color: "#38bdf8"

  # clip: only the portions of bike routes inside park boundaries
  - type: intersection
    inputs: [bike_routes, parks]
    output: bike_routes_in_parks
    name: Bike Routes In Parks
    params:
      mode: clip
    color: "#f59e0b"

layers:
  # Parks - faint fill, visible outline
  - id: parks-fill
    source: parks
    type: fill
    paint:
      fill-color: "#a78bfa"
      fill-opacity: 0.08

  - id: parks-outline
    source: parks
    type: line
    paint:
      line-color: "#a78bfa"
      line-width: 1.5
      line-opacity: 0.5

  # Full bike network - dim context layer
  - id: bike-routes-line
    source: bike_routes
    type: line
    paint:
      line-color: "#22c55e"
      line-width: 1.5
      line-opacity: 0.25

  # Filter result - full segments that touch a park (sky blue)
  - id: filter-result-line
    source: bike_routes_near_parks
    type: line
    paint:
      line-color: "#38bdf8"
      line-width: 2
      line-opacity: 0.7

  # Clip result on top - exact in-park geometry (amber)
  - id: clip-result-line
    source: bike_routes_in_parks
    type: line
    paint:
      line-color: "#f59e0b"
      line-width: 2.5
      line-opacity: 0.95