README % R. Pittman, randall.pittman@oregonstate.edu - 14 Oct 2020

# OSU Wind Sensor Data from the Inner Shelf DRI

These CSV files contain reports from an FTTech wind sensor from the Inner Shelf DRI, collected by the Oregon
State University Nearshore Remote Sensing Group (OSU-NRSG) led by Merrick Haller
(https://cce.oregonstate.edu/haller).

Inquires about these data can be sent to randall.pittman@oregonstate.edu or merrick.haller@oregonstate.edu

OSU-NRSG data RI: Randall Pittman

## Data Format

The CSV wind data files contain timestamped NMEA0183 $WIMWV messages. Each file has five minutes of messages,
and the CSV files are grouped into folders by day.

An example message from a CSV wind file is annotated here (from http://www.nuovamarea.net/blog/wimwv):

yyyy,mm,dd,HH,MM,SS.F,$WIMWV,<1>,<2>,<3>,<4>,<5>*hh

Fields
<1>   Wind angle, 0.0 to 359.9 degrees, in relation to the vessel’s bow/centerline, to the nearest 0.1
        degree. If the data for this field is not valid, the field will be blank.
<2>   Reference:
        R = Relative (apparent wind, as felt when standing on the moving ship)
        T = Theoretical (calculated actual wind, as though the vessel were stationary)
<3>   Wind speed, to the nearest tenth of a unit.  If the data for this field is not valid, the field will
        be blank.
<4>   Wind speed units:
        K = km/hr M = m/s
        N = knots
        S = statute miles/hr
<5>   Status:
        A = data valid; V = data invalid
hh    8-bit checksum (hexadecimal)

Note that the wind direction is relative to the sensor orientation, noted below.

The MATLAB script fttech_loadfile.m reads the individual .csv files (each containing NMEA 0183 sentences).

## Sensor Location and Temporal Coverage

The FTTech FT742 wind sensor was installed above Conex box, ~5 m North of Oregon State University X-band
radar tower at Guadalupe Restoration Project.

Latitude: 34.978782
Longitude: -120.640663
Sensor elevation: 3.1 m above ground level
Sampling rate: 10 Hz
Sensor direction origin: 6 deg east of north (dirTrue = dirRel + 6)
Data available: 2017-10-07 23:35:00 UTC - 2017-10-26 15:25:00 UTC