RainViewer Fix — Cobb County Tree-Risk Monitor

Date: 2026-10-08
File: weather-panel.js

Problem

The hero map showed a warning overlay ("API key required" watermark image) instead of real radar tiles.

Root Cause

RainViewer dropped support for color scheme 4. Their current API only supports color scheme 2 (Universal Blue). The tile URL was requesting /256/{z}/{x}/{y}/4/1_1.png which returned a warning image.

Additionally, RainViewer radar tiles are only available up to zoom level 7. The map was set to zoom 9 with no maxNativeZoom cap, causing requests for zoom 9 tiles that don't exist.

Changes Made

1. Color scheme 4 → 2

Before: data.host + f.path + "/256/{z}/{x}/{y}/4/1_1.png"
After:  data.host + f.path + "/256/{z}/{x}/{y}/2/1_1.png"

2. maxNativeZoom: 7 added

Leaflet now upscales zoom-7 tiles for the map's zoom-9 view instead of requesting non-existent tiles.

3. RainViewer attribution added

Per RainViewer's terms, a "Weather data by RainViewer" credit linking to https://www.rainviewer.com/ is now included in the tile layer's attribution option (rendered in Leaflet's attribution control).

Tile Test

Live tile verified against https://api.rainviewer.com/public/weather-maps.json — the public endpoint returns host + path with no API key required. Color scheme 2 tiles load correctly.

Notes

• RainViewer's public API requires no API key or registration (confirmed at rainviewer.com/api.html).
• The NWS weather data / tree-risk Worker was unaffected throughout.
• Commits: 4f017a0 (color scheme fix), 1d39b2a (attribution).