Claude/test parcel slope analyzer nmp7 i - #131
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Self-contained HTML tool that: - Prompts for Mapbox token at runtime (stored in sessionStorage only, never committed to git) - Queries Sevier County ArcGIS FeatureServer trying both GISLINK and ID field formats across multiple candidate endpoints, reporting which one successfully returns the Foust parcel boundary polygon - Samples elevation via Mapbox Terrain-RGB at a 10×10 grid across the parcel bounding box, with tile caching to minimise requests - Calculates per-cell slope using finite differences; reports avg/max - Renders parcel outline + slope heatmap (green→red) on a Mapbox satellite-streets map https://claude.ai/code/session_01A8hTZVRcXuDPbKeUYNByt5
…ion bands Architecture overhaul: - Mapbox GL JS is rendering/interaction layer only (pk. token, runtime input) - ArcGIS FeatureServer (services3.arcgis.com) is parcel data source — click any parcel to trigger spatial query (esriGeometryPoint / esriSpatialRelIntersects) - USGS 3DEP EPQS replaces Terrain-RGB for elevation (per-point JSON API) - City limits layer (services1.arcgis.com) drives jurisdiction detection Jurisdiction-specific slope band profiles: - Gatlinburg: 0-19 / 20-29 / 30-49 / 50%+ (geotech-trigger at 30%) - Sevierville: 0-15 / 15-30 / 30-50 / 50%+ (critical-slope at 30%) - Sevier County / Unincorporated: same as Sevierville Key features: - Click any parcel → ArcGIS query → highlight + fit bounds + attribute sidebar - 10×10 EPQS elevation grid clipped to parcel interior via ray-casting PIP - Finite-difference slope (%) and slope (°) per interior sample - Slope band breakdown bars, % over 30% callout with jurisdiction label - Background parcel outlines at zoom ≥ 13 via viewport bbox query - sk. token blocked at entry; pk. token stored in sessionStorage only - Planning-grade + not-a-survey disclaimers https://claude.ai/code/session_01A8hTZVRcXuDPbKeUYNByt5
Remote had a partial USGS 3DEP update; this merge preserves the full rewrite (click-any-parcel, jurisdiction detection, slope band profiles). https://claude.ai/code/session_01A8hTZVRcXuDPbKeUYNByt5
requestAnimationFrame double-wrap ensures Mapbox measures the #map container only after the browser has reflowed from display:none → flex. https://claude.ai/code/session_01A8hTZVRcXuDPbKeUYNByt5
The parcel FeatureServer was aborting on first cold request. https://claude.ai/code/session_01A8hTZVRcXuDPbKeUYNByt5
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merge into main