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SKILL_JS5_ARCGIS / arcgis-layers

AGENTS.md1 starsChanged 6 months agoMITView on GitHub

Quick-reference for adding and querying layers. Read before generating data code. 1. Source? Feature service → FeatureLayer; .geojson → GeoJSONLayer; .csv → CSVLayer; client graphics → GraphicsLayer; tiles → TileLayer. 2. Querying? layer.createQuery(), then q.where = (${q.where}) AND ... (keeps the definitionExpression). 3. Need fields from a query? Set query.outFields (the layer's outFields do not limit queries). 4. Large dataset? Server-side where; results stop at maxRecordCount (exceededTransferLimit).

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AGENTS.md

Agent Guide: arcgis-layers

Quick-reference for adding and querying layers. Read before generating data code.

Quick Decision Tree

  1. Source? Feature service → FeatureLayer; .geojson → GeoJSONLayer; .csv → CSVLayer; client graphics → GraphicsLayer; tiles → TileLayer.
  2. Querying? layer.createQuery(), then q.where = `(${q.where}) AND ...` (keeps the definitionExpression).
  3. Need fields from a query? Set query.outFields (the layer's outFields do not limit queries).
  4. Large dataset? Server-side where; results stop at maxRecordCount (exceededTransferLimit).

Setup Checklist

  • Create the layer with the Core API, then map.add(layer).
  • Set outFields to the fields you actually use.
  • Use layer.createQuery() + queryFeatures for reads; never overwrite its where.
  • Check exceededTransferLimit before treating a result as complete.
  • Page with query.start / query.num for big result sets.

Anti-patterns (one-liner reminders)

  • ❌ outFields: ["*"] by default.
  • ❌ Client-side filtering of a full download.
  • ❌ q.where = "..." on a layer with definitionExpression (drops the filter).
  • ❌ new Query() expecting geometry (returnGeometry is false).
  • ❌ Index-assigning into map.layers (use add/removeAt).

Files in This Skill

  • SKILL.md / SKILL.es.md — full guides
  • references/api-detail.md — Layer + Query signatures
  • references/examples.md — GeoJSON / CSV / query
  • references/pitfalls.md — extended troubleshooting
  • scripts/snippet-featurelayer-query.ts, snippet-geojson.ts, snippet-graphics.ts

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