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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 - Buffer / Dissolve
# Vancouver bikeways buffered by 200m to show walking-distance zones.
# Geodetically accurate - buffers use UTM reprojection for true circular geometry.
# Dissolve merges overlapping buffers into a single walkshed polygon.

map:
  center: [-123.1207, 49.2827]  # Vancouver, BC
  zoom: 12
  basemap: carto-dark

datasets:
  - id: bikeways
    url: "https://opendata.vancouver.ca/api/explore/v2.1/catalog/datasets/bikeways/exports/geojson?lang=en&timezone=America%2FLos_Angeles"
    name: Vancouver Bikeways
    color: "#38bdf8"

operations:
  - type: buffer
    input: bikeways
    output: bikeway_walkshed
    name: Bikeway Walkshed (200m)
    params:
      distance: 200
      units: meters
      dissolve: true
    color: "#a78bfa"

layers:
  # Walkshed fill - dissolved buffer polygon
  - id: walkshed-fill
    source: bikeway_walkshed
    type: fill
    paint:
      fill-color: "#a78bfa"
      fill-opacity: 0.15

  # Walkshed outline
  - id: walkshed-outline
    source: bikeway_walkshed
    type: line
    paint:
      line-color: "#c4b5fd"
      line-width: 1.5
      line-opacity: 0.6

  # Bikeways on top
  - id: bikeways-line
    source: bikeways
    type: line
    paint:
      line-color: "#38bdf8"
      line-width: 2.5