IObridge.com provides an on line logging service. Every 15 minutes, we are posting tide height in inches to the log. Here is a graph of recent log output:
The tide level is measured in inches vs. a bottom reference at the measurement location. Time is on the X-axis.
I'll be watching the tide in this coastal estuary on Cape Cod vs. reference tide information in Boston.
Some additional signal processing is required to average out wave action. I'll review more of this in later posts.