About Seaidx

Seaidx is an experimental coastal-traveler companion that fuses tide prediction, satellite ocean color, and meteorology into a single, easy-to-read Ocean Viewing Index (OVI).

Data Sources

  • Tides: TPXO 9.1 ocean tide model via NOAA, with harmonic constituents refined per location.
  • Ocean color: MODIS Aqua & Sentinel-3 OLCI surface reflectance, processed to chlorophyll-a and turbidity.
  • Weather: Open-Meteo Marine API for sea state, wind and lighting.
  • Astronomy: Moon phase and sunrise/sunset from standard JPL ephemerides.

OVI Algorithm

The Ocean Viewing Index is a weighted 0–100 score combining six sub-indices:

  • • Color (hue saturation)
  • • Clarity (inverse turbidity)
  • • Visibility (horizontal range)
  • • Sea State (wave height / Beaufort)
  • • Lighting (sun angle & cloud cover)
  • • Water Quality (chlorophyll & pollution markers)

Rating tiers: 80+ Excellent (green), 65+ Good (blue), 50+ Fair (yellow), 35+ Poor (orange), below 35 Bad (red).

Founded by Citron Chan. Seaidx is part of the VoyBird travel platform.

Disclaimer

All values are model-derived estimates for travel planning only. Seaidx is not a navigation aid and must not be relied upon for safety-critical decisions. Always check official marine forecasts before entering the water.