Data sources and credits

United States — NOAA CO-OPS

Tide predictions computed by TideCatch from NOAA CO-OPS harmonic constants. Not endorsed by NOAA.

Harmonic constants, subordinate-station offsets and datums from the NOAA Center for Operational Oceanographic Products and Services. U.S. Government work in the public domain. TideCatch does not use the NOAA logo, and NOAA does not endorse TideCatch. https://tidesandcurrents.noaa.gov/

Japan — Japan Meteorological Agency (気象庁)

出典：気象庁ホームページ（潮位表・分潮一覧表）。分潮一覧表の調和定数、または潮位表の毎時潮位から TideCatch が算出した調和定数を用いて推算

Harmonic constants and station list from the JMA tide tables, processed (加工) by TideCatch. Used under the Public Data License (公共データ利用規約) version 1.0, which is compatible with CC BY 4.0. These predictions are not published by JMA. https://www.data.jma.go.jp/kaiyou/db/tide/suisan/index.php

License terms: https://www.jma.go.jp/jma/kishou/info/coment.html

Korea — Korea Hydrographic and Oceanographic Agency (국립해양조사원)

출처: 해양수산부 국립해양조사원 (공공누리 제1유형) · 조화상수를 가공하여 TideCatch가 추산

Tide station harmonic constants from the Ministry of Oceans and Fisheries, KHOA (data.go.kr), processed by TideCatch. Korea Open Government License Type 1 (source attribution). https://www.khoa.go.kr/ · https://www.data.go.kr/

License terms: https://www.kogl.or.kr/info/licenseType1.do

Algorithms

Tidal prediction follows P. Schureman, Manual of Harmonic Analysis and Prediction of Tides (1958, U.S. Government publication). Sun and moon calculations follow the published algorithms of J. Meeus, Astronomical Algorithms. All code is written independently for TideCatch.

Maps

Maps are provided by Apple Maps (MapKit).