Dataset Title:USCGC Healy hly-02-03 - 1-Minute Position and Weather Data Creation Date: 7/30/2003 Author: Greg Stossmeister UCAR/JOSS P.O. Box 3000 Boulder, CO 80307 (303)497-8692 gstoss@ucar.edu Dataset Overview: This dataset is a composite of several ship underway datasets produced by the U.S. Coast Guard aboard the USCGC Healy during the Summer SBI Process Cruise of 2002 (hly-02-03). Routine data logging procedures for underway data aboard the Healy archive data of different types in physically seperate files. This has the unfortunate effect of seperating interesting data from the location of the ship when the measurement was taken. To remedy this situation, a perl script was written by the author to produce a composite file that contained both ship position and weather information collected during the above mentioned cruise. This file is a composite of the PCode-Aft_GGA position datafiles (1 second resolution), the RMYoung-AIR weather datafiles (3 second resolution), and the TrueWindSpeed datafiles (1 second resolution). The composite is a collection of grab samples (not averages) at approximately 1 minute intervals during the cruise. The composites were constructed by starting with the time at which the weather observation occurred. The TrueWindSpeed files were then searched to find corresponding wind information. Lastly, the position files were searched until the position at the observation time was found. If the times matched or were within 10 seconds of one another, the weather, winds and position data were written to the composite file. The position information was converted from Degrees Minutes Seconds format (DDDMM.SSS) to a Decimal Degrees format (DDD.DDDDD) Data File Format: The data are ASCII comma-seperated value format. Header information is found at the top of the data file. Here are the column assignments: Column 1 - Wx Year - Year of weather observation Column 2 - Wx Mon - Month of weather observation Column 3 - Wx Day - Day of weather observation Column 4 - Wx Hour - Hour of weather observation Column 5 - Wx Min - Minute of weather observation Column 6 - Wx Sec - Second of weather observation Column 7 - Latitude - Ship position (Aft GGA) (DD.DDDDD) Column 8 - Longitude - Ship position (Aft GGA) (-DDD.DDDDD) Column 9 - Air Temp - Air Temperature (C) Column 10 - Dew point - Dew Point Temperature (C) Column 11 - RH - Relative Humidity (%) Column 12 - Pres - Station Pressure (hPa) Column 13 - Wind Spd - Wind Speed (knots) Column 14 - Wind Dir - Wind Direction (Degrees) Column 15 - Pos Year - Year of position information Column 16 - Pos Mon - Month of position information Column 17 - Pos Day - Day of position information Column 18 - Pos Hour - Hour of position information Column 19 - Pos Min - Minute of position information Column 20 - Pos Sec - Second of position information