Data Quality Reports for Session: 128331 User: roman2 Completed: 06/09/2010

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000119.1SGP/GPS/X1 - GPS antenna upgradessgp30wpdngpsX1.00, sgp30wpdngpsX1.c1
D000720.1SGP/GPS/X1 - Change in Algorithmsgp30wpdngpsX1.00, sgp30wpdngpsX1.c1
D060915.6SGP/WPDN/X1 - Reprocessed: WPDN GPS errors in station infosgp30wpdngpsX1.c1
D980511.1Offset in Precipitable Water Vaporsgp30wpdngpsX1.00, sgp30wpdngpsX1.c1


DQRID : D000119.1
Start DateStart TimeEnd DateEnd Time
01/01/1996000012/26/19992359
Subject:
SGP/GPS/X1 - GPS antenna upgrades
DataStreams:sgp30wpdngpsX1.00, sgp30wpdngpsX1.c1
Description:
Seth Gutman from NOAA/FSL informed me that the GPS antennas at three of
the sites in their network were replaced with newer models.  These newer
antennas should result in better retrievals of PWV from the GPS.  These
sites and the dates the antennas where changed are:

	Lamont  	12/23/1999
	Purcell		12/26/1999
	Plattville	12/16/1999
Measurements:sgp30wpdngpsX1.c1:
  • base time(base_time)
  • Time of observation(timeObs)
  • lat(lat)
  • Wet component GPS signal delay(wetDelay)
  • Station Location(staLongNam)
  • air temperature (NGM250 predicted)(temperature)
  • Alphanumeric station name(staNam)
  • Time offset of tweaks from base_time(time_offset)
  • Total GPS signal delay(totalDelay)
  • lon(lon)
  • Dummy altitude for Zeb(alt)
  • Dry component GPS signal delay(dryDelay)
  • atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)
  • Formal Error(formalError)
  • Water Vapor(waterVapor)
sgp30wpdngpsX1.00:
  • null(Raw data stream - documentation not supported)

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DQRID : D000720.1
Start DateStart TimeEnd DateEnd Time
01/01/1996000006/27/20002359
Subject:
SGP/GPS/X1 - Change in Algorithm
DataStreams:sgp30wpdngpsX1.00, sgp30wpdngpsX1.c1
Description:
The algorithm for computing water vapor changed after this end date.
The files generated after this date have a global attribute indicating
the change. The new algorithm is to be documented in a NOAA Technical
Memo.
Measurements:sgp30wpdngpsX1.c1:
  • Water Vapor(waterVapor)
sgp30wpdngpsX1.00:
  • null(Raw data stream - documentation not supported)

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DQRID : D060915.6
Start DateStart TimeEnd DateEnd Time
10/18/2005000008/27/20062359
Subject:
SGP/WPDN/X1 - Reprocessed: WPDN GPS errors in station info
DataStreams:sgp30wpdngpsX1.c1
Description:
Starting 10/18/05, there were problems with the station information in the
sgp30wpdngpsX1.c1 data.   There were extra stations listed with shortened station 
abbreviations and shortened long names. The data itself was okay, there were just extra stations 
listed.
   
The data for 10/18/05 - 08/27/06 were reprocessed and archived in October, 2006.
Measurements:sgp30wpdngpsX1.c1:
  • base time(base_time)
  • Time of observation(timeObs)
  • lat(lat)
  • Wet component GPS signal delay(wetDelay)
  • Station Location(staLongNam)
  • air temperature (NGM250 predicted)(temperature)
  • Alphanumeric station name(staNam)
  • Time offset of tweaks from base_time(time_offset)
  • Total GPS signal delay(totalDelay)
  • lon(lon)
  • Dummy altitude for Zeb(alt)
  • Formal Error(sigma)
  • Dry component GPS signal delay(dryDelay)
  • Formal Error(formalError)
  • atmospheric pressure at mean sea level and at tropopause (NGM250 predicted)(pressure)
  • Water Vapor(waterVapor)

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DQRID : D980511.1
Start DateStart TimeEnd DateEnd Time
12/20/1995000011/03/19962359
Subject:
Offset in Precipitable Water Vapor
DataStreams:sgp30wpdngpsX1.00, sgp30wpdngpsX1.c1
Description:
The precipitable water vapor (PWV) is offset 2-3mm low during this time
period. However, the offset does vary over this period of time. Dan Wolfe,
ETL, states that the offset was caused by a combination of a mapping 
function and the fact that they were not collecting or processing
satellite data below 15 degrees above the horizon. He further states
that the trends were still fine during this period.
Measurements:sgp30wpdngpsX1.c1:
  • Dry component GPS signal delay(dryDelay)
  • Formal Error(formalError)
  • Wet component GPS signal delay(wetDelay)
  • Total GPS signal delay(totalDelay)
  • Water Vapor(waterVapor)
sgp30wpdngpsX1.00:
  • null(Raw data stream - documentation not supported)

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