Submarius – Global water clarity for divers
Submarius started as just a dashboard for diving conditions, but I quickly realized that there is simply no API for water clarity, nor even a simple way to calculate it. Divers call it viz, and it is one of the most consequential factors for a diving experience. So I dove the viz rabbit-hole. I landed on a state-augmented ensemble kalman filter. More details on the /clarity page. My question for the HN audience is if anyone knows of a better way of doing this? There is a ton of satellite data to train on, but a lot of it is messy (clouds read as turbid water, shallow reefs reflect…
In plain words
Submarius provides global water clarity data for divers through an API and dashboard. The tool addresses the lack of available visibility forecasting by using satellite data and advanced filtering algorithms to predict "viz" conditions at dive sites worldwide. Water clarity is a critical factor in dive planning, and Submarius aims to fill a gap where no existing solution existed. The maker developed the system using a state-augmented ensemble Kalman filter to process satellite imagery and is seeking feedback on the approach.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Submarius started as just a dashboard for diving conditions, but I quickly realized that there is simply no API for water clarity, nor even a simple way to calculate it. Divers call it viz, and it is one of the most consequential factors for a diving experience. So I dove the viz rabbit-hole. I landed on a state-augmented ensemble kalman filter. More details on the /clarity page. My question for the HN audience is if anyone knows of a better way of doing this? There is a ton of satellite data to train on, but a lot of it is messy (clouds read as turbid water, shallow reefs reflect abnormally causing bad readings, etc). Appreciate any feedback on the subject. Enjoy the read!
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