qc procedures at incois
DESCRIPTION
QC Procedures at INCOIS. TVS Udaya Bhaskar, CLIVAR(GSOP), 12 - 14 th June, 2013. Type of Data sets. Argo data from Indian and non-Indian floats. CTD data from Indian ORV. XBT/XCTD data from National Institute of Oceanography (NIO), Goa. - PowerPoint PPT PresentationTRANSCRIPT
QC Procedures at INCOIS
TVS Udaya Bhaskar,
CLIVAR(GSOP), 12 - 14th June, 2013
Type of Data sets Argo data from Indian and non-Indian
floats. CTD data from Indian ORV. XBT/XCTD data from National Institute of
Oceanography (NIO), Goa. Specific Project related data viz., ARMEX,
BOBMEX, ICRP etc. Time series data also available.
Moorings, Drifters, Current Meter Arrays, ADCPs etc.
QC procedures For CTDs and Argo floats
Automatic QC as proposed by ADMT Three-way-QC
Automatic QC, QC based on Objective Analysis Visual Quality Control Tool
Cluster based Latitude, Longitude based clusters
For XBT/XCTDs QC is performed at NIO, Goa Planning to use Mquest by CSIRO.
CTD Profiles
RTQC (18 checks)
Objective Analysis
Visual QC(adjust flags)
Bulls eye Others
Data-base
Assign quality flag
Visual Quality Control of Argo/CTD data
Visual Quality Control Tools is used for QC of Argo data. WOA05 is used in the background for the QC process.
Profiles falling out of 3*sigma are set as bad.
T&S Profiles (Argo Floats, XBT, XCTD, CTD)
Quality control of oceanographic data sets based on spatio-temporal clustering
Clustering method with recent WOA09 climatology.
Tested for all standard levels
Sensitivity studies were done.
QC based on Lat/Lon Clusters
Climatological mean and standard deviation are used to build n-sided (dimensional) polygon.
Outliers are detected based by judging whether the points are falling with in the polygon or out side.
These are re-examined for any special events and then injected into the database.
The n-sided polygon is used for checking outliers. Now the data points whosequality is to checked are introduced and checked whether the points fall with in the n-sided polygon (good points) or outside the polygon (bad points).
Good point
Outlier
Outliers
Outliers
Depth 10 m
Latitude (deg)
BOB
Persian
Gulf
Red Sea
Outliers
Thank You