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Tides and Water Levels Benchmarks Data Base

Model Summary

Model as a set of tables and describe as:

A TWL_STATION ...

has one MEDS number, name, owner, place (country, province, region),

has one position (latitude, longitude), established date, and general description

may have one or more ALTERNATE_STATION_NAMEs (name)

has one active and possibly several historical DATUM_OF_ELEVATIONS (elevation parameters, epoch, description)

has one active and possibly several historical TWL_STATION_SKETCHs (picture)

has one or more STATION_MONUMENTs... each of which...

has one benchmark number (MEDS station/benchmark and unique number),

has one position (latitude, longitude), established date, general description

has one active and possibly several historical BENCHMARK_ELEVATIONs (datum type name, elevation parameters, epoch)

has one or more NRCAN_ELEVATIONs (elevation parameters, epoch, description parameters)