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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 - Difference (Subtract + Exclude)
# Ottawa neighbourhoods minus parks and greenspaces.
#
# Two operations show the behavioral difference:
#   subtract - carves park geometry out of each neighbourhood polygon (non-park footprint)
#   exclude  - keeps only neighbourhoods with zero park/greenspace presence

map:
  center: [-75.6972, 45.4215]  # Ottawa, ON
  zoom: 11
  basemap: carto-dark

datasets:
  - id: neighbourhoods
    url: "https://services.arcgis.com/G6F8XLCl5KtAlZ2G/arcgis/rest/services/GEN3_OTT_1_3_3/FeatureServer/0/query?outFields=*&where=1%3D1&f=geojson"
    name: Ottawa Neighbourhoods
    color: "#22c55e"

  - id: parks
    url: "https://maps.ottawa.ca/arcgis/rest/services/Parks_Inventory/MapServer/24/query?outFields=*&where=1%3D1&f=geojson"
    name: Ottawa Parks and Greenspaces
    color: "#f59e0b"

operations:
  # subtract: park geometry punched out of each neighbourhood polygon
  - type: difference
    inputs: [neighbourhoods, parks]
    output: non_park_footprint
    name: Non-Park Footprint
    params:
      mode: subtract
    color: "#38bdf8"

  # exclude: only neighbourhoods that don't touch any park at all
  - type: difference
    inputs: [neighbourhoods, parks]
    output: park_free_neighbourhoods
    name: Park-Free Neighbourhoods
    params:
      mode: exclude
    color: "#a78bfa"

layers:
  # Parks - amber fill, visible but not dominant
  - id: parks-fill
    source: parks
    tooltip: NAME
    type: fill
    paint:
      fill-color: "#f59e0b"
      fill-opacity: 0.25

  - id: parks-outline
    source: parks
    type: line
    paint:
      line-color: "#f59e0b"
      line-width: 1
      line-opacity: 0.6

  # Source neighbourhoods - faint context
  - id: neighbourhoods-outline
    source: neighbourhoods
    type: line
    paint:
      line-color: "#22c55e"
      line-width: 1
      line-opacity: 0.3

  # Subtract result - neighbourhood polygons with parks carved out (sky blue)
  - id: non-park-fill
    source: non_park_footprint
    type: fill
    paint:
      fill-color: "#38bdf8"
      fill-opacity: 0.15

  - id: non-park-outline
    source: non_park_footprint
    type: line
    paint:
      line-color: "#38bdf8"
      line-width: 1.5
      line-opacity: 0.8

  # Exclude result - park-free neighbourhoods highlighted (purple)
  - id: park-free-fill
    source: park_free_neighbourhoods
    type: fill
    paint:
      fill-color: "#a78bfa"
      fill-opacity: 0.2

  - id: park-free-outline
    source: park_free_neighbourhoods
    type: line
    paint:
      line-color: "#a78bfa"
      line-width: 2
      line-opacity: 0.9