CoastWatch Great Lakes Water Levels Data Base Record Format
Data file names and directory: p/s/lwl/yyyy/gyyyyjjj00.lwl p/s/lwm/yyyy/gyyyyjjj00.lwm Where: yyyy = Four digit year jjj = Julian day of year lwl = Hourly water levels lwm = Daily mean water levels Columns Description ------- ----------- 1- 2 Last two digits of year of observation 3- 5 Julian day of observation 6- 7 Hour of observation (gauge LST) 8-10 NOS geographic region code: 831 = St. Lawrence River 901 = St. Clair River 903 = Lake St. Clair 904 = Detroit River 905 = Lake Ontario 906 = Lake Erie, Niagara River 907 = Lake Huron, St. Mary's River 908 = Lake Michigan 909 = Lake Superior 11-14 NOS Gauge ID code: 10dd = St. Lawrence River 20dd = Lake Ontario 30dd = Lake Erie, Niagara River 40dd = Lake St. Clair, Detroit River, St. Clair River 50dd = Lake Huron 60dd = St. Mary's River 70dd = Lake Michigan 90dd = Lake Superior 15-20 Water level (millimeters)
CoastWatch Great Lakes Water Levels Data Base Gauge Directory Record Format
Directory file: p/s/lwl/gauges.dat Columns Description ------- ----------- 1- 3 NOS Geographic region code: 831 = St. Lawrence River 901 = St. Clair River 903 = Lake St. Clair 904 = Detroit River 905 = Lake Ontario 906 = Lake Erie, Niagara River 907 = Lake Huron, St. Mary's River 908 = Lake Michigan 909 = Lake Superior 4- 7 NOS Gauge ID code: 10dd = St. Lawrence River 20dd = Lake Ontario 30dd = Lake Erie, Niagara River 40dd = Lake St. Clair, Detroit River, St. Clair River 50dd = Lake Huron 60dd = St. Mary's River 70dd = Lake Michigan 90dd = Lake Superior 8-28 Gauge Location 29-32 Latitude in hundredths of a degree 33-36 Longitude in hundredths of a degree 37-39 Low water datum in meters (IGLD 1985) 40-40 Reporting frequency: 0 = Hourly 1 = Daily 2 = Monthly 41-41 Time zone of gauge: 0 = Greenwich mean time 1 = Eastern time 2 = Central time